Add dark mode override for non-native DevExpress themes

Implements a dark mode override system for DevExpress Blazor themes lacking native dark support. Adds a JS function to toggle a dx-dark class on <html>, updates ThemeState to detect native dark themes, and applies targeted CSS variable overrides for consistent dark styling. Disables prerendering to ensure JS interop, and improves theme switching logic and documentation.
Remove unused menu state and toggle logic from NavMenu
2026-05-05 16:41:15 +02:00 · 2026-04-30 15:41:05 +02:00 · 2026-04-30 15:37:04 +02:00 · 2026-04-23 15:59:50 +02:00 · 2026-04-23 15:44:26 +02:00 · 2026-04-23 13:55:05 +02:00
78 changed files with 832 additions and 606 deletions
--- a/DbFirst.API/Controllers/CatalogsController.cs
+++ b/DbFirst.API/Controllers/CatalogsController.cs
@@ -1,7 +1,7 @@
-using DbFirst.Application.Catalogs;
+
 using DbFirst.Application.Catalogs.Commands;
 using DbFirst.Application.Catalogs.Queries;
-using DbFirst.Domain;
+using DbFirst.Contracts.Catalogs;
 using MediatR;
 using Microsoft.AspNetCore.Mvc;

@@ -37,7 +37,7 @@ public class CatalogsController : ControllerBase
    }

    [HttpPost]
-    public async Task<ActionResult<CatalogReadDto>> Create(CatalogWriteDto dto, CancellationToken cancellationToken)
+    public async Task<ActionResult<CatalogReadDto>> Create([FromBody]CatalogWriteDto dto, CancellationToken cancellationToken)
    {
        var created = await _mediator.Send(new CreateCatalogCommand(dto), cancellationToken);
        if (created == null)
@@ -48,19 +48,8 @@ public class CatalogsController : ControllerBase
    }

    [HttpPut("{id:int}")]
-    public async Task<ActionResult<CatalogReadDto>> Update(int id, CatalogWriteDto dto, CancellationToken cancellationToken)
+    public async Task<ActionResult<CatalogReadDto>> Update(int id, [FromBody] CatalogWriteDto dto, CancellationToken cancellationToken)
    {
-        var current = await _mediator.Send(new GetCatalogByIdQuery(id), cancellationToken);
-        if (current == null)
-        {
-            return NotFound();
-        }
-        if (dto.UpdateProcedure == CatalogUpdateProcedure.Update &&
-            !string.Equals(current.CatTitle, dto.CatTitle, StringComparison.OrdinalIgnoreCase))
-        {
-            return BadRequest("Titel kann nicht geändert werden.");
-        }
-
        var updated = await _mediator.Send(new UpdateCatalogCommand(id, dto), cancellationToken);
        if (updated == null)
        {
--- a/DbFirst.API/Controllers/LayoutsController.cs
+++ b/DbFirst.API/Controllers/LayoutsController.cs
@@ -1,7 +1,8 @@
-using System.Text;
 using DbFirst.Application.Repositories;
+using DbFirst.Contracts.Layouts;
 using DbFirst.Domain.Entities;
 using Microsoft.AspNetCore.Mvc;
+using System.Text;

 namespace DbFirst.API.Controllers;

@@ -83,12 +84,4 @@ public class LayoutsController : ControllerBase
            LayoutData = layoutData
        };
    }
-
-    public sealed class LayoutDto
-    {
-        public string LayoutType { get; set; } = string.Empty;
-        public string LayoutKey { get; set; } = string.Empty;
-        public string UserName { get; set; } = string.Empty;
-        public string LayoutData { get; set; } = string.Empty;
-    }
 }
--- a/DbFirst.API/Controllers/MassDataController.cs
+++ b/DbFirst.API/Controllers/MassDataController.cs
@@ -1,6 +1,6 @@
-using DbFirst.Application.MassData;
 using DbFirst.Application.MassData.Commands;
 using DbFirst.Application.MassData.Queries;
+using DbFirst.Contracts.MassData;
 using MediatR;
 using Microsoft.AspNetCore.Mvc;

@@ -50,7 +50,7 @@ public class MassDataController : ControllerBase
    }

    [HttpPost("upsert")]
-    public async Task<ActionResult<MassDataReadDto>> Upsert(MassDataWriteDto dto, CancellationToken cancellationToken)
+    public async Task<ActionResult<MassDataReadDto>> Upsert([FromBody]MassDataWriteDto dto, CancellationToken cancellationToken)
    {
        var result = await _mediator.Send(new UpsertMassDataByCustomerNameCommand(dto), cancellationToken);
        return Ok(result);
--- a/DbFirst.API/Dashboards/DashboardChangeNotifier.cs
+++ b/DbFirst.API/Dashboards/DashboardChangeNotifier.cs
@@ -6,14 +6,23 @@ namespace DbFirst.API.Dashboards;
 public class DashboardChangeNotifier : IDashboardChangeNotifier
 {
    private readonly IHubContext<DashboardsHub> _hubContext;
+    private readonly ILogger<DashboardChangeNotifier> _logger;

-    public DashboardChangeNotifier(IHubContext<DashboardsHub> hubContext)
+    public DashboardChangeNotifier(IHubContext<DashboardsHub> hubContext, ILogger<DashboardChangeNotifier> logger)
    {
        _hubContext = hubContext;
+        _logger = logger;
    }

-    public void NotifyChanged()
+    public async Task NotifyChangedAsync()
    {
-        _ = _hubContext.Clients.All.SendAsync("DashboardsChanged");
+        try
+        {
+            await _hubContext.Clients.All.SendAsync("DashboardsChanged");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Failed to notify dashboard clients.");
+        }
    }
 }
--- a/DbFirst.API/Dashboards/DashboardConfiguratorFactory.cs
+++ b/DbFirst.API/Dashboards/DashboardConfiguratorFactory.cs
@@ -0,0 +1,115 @@
+using DbFirst.Domain.Entities;
+using DevExpress.DashboardCommon;
+using DevExpress.DashboardWeb;
+using DevExpress.DataAccess.Json;
+using System.Xml.Linq;
+
+namespace DbFirst.API.Dashboards;
+
+public static class DashboardConfiguratorFactory
+{
+    public static DashboardConfigurator Create(
+        IServiceProvider serviceProvider,
+        IConfiguration configuration,
+        IWebHostEnvironment environment)
+    {
+        // Den gesamten Inhalt des Lambdas hierher verschieben
+        // serviceProvider, configuration, environment statt builder.* verwenden
+
+        var dashboardsPath = Path.Combine(environment.ContentRootPath, "Data", "Dashboards");
+        Directory.CreateDirectory(dashboardsPath);
+
+        var defaultDashboardPath = Path.Combine(dashboardsPath, "DefaultDashboard.xml");
+        if (!File.Exists(defaultDashboardPath))
+        {
+            var defaultDashboard = new Dashboard();
+            defaultDashboard.Title.Text = "Default Dashboard";
+            defaultDashboard.SaveToXml(defaultDashboardPath);
+        }
+
+        var dashboardBaseUrl = configuration["Dashboard:BaseUrl"]
+            ?? configuration["ApiBaseUrl"]
+            ?? configuration["ASPNETCORE_URLS"]?.Split(';', StringSplitOptions.RemoveEmptyEntries).FirstOrDefault()
+            ?? "https://localhost:7204";
+
+        dashboardBaseUrl = dashboardBaseUrl.TrimEnd('/');
+
+        var catalogsGridDashboardPath = Path.Combine(dashboardsPath, "CatalogsGrid.xml");
+        if (!File.Exists(catalogsGridDashboardPath))
+        {
+            var dashboard = new Dashboard();
+            dashboard.Title.Text = "Catalogs (Dashboard Grid)";
+
+            var catalogDataSource = new DashboardJsonDataSource("Catalogs (API)")
+            {
+                ComponentName = "catalogsDataSource",
+                JsonSource = new UriJsonSource(new Uri($"{dashboardBaseUrl}/api/catalogs"))
+            };
+
+            dashboard.DataSources.Add(catalogDataSource);
+
+            var grid = new GridDashboardItem
+            {
+                DataSource = catalogDataSource,
+                Name = "Catalogs"
+            };
+
+            grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.Guid))) { Name = "Id" });
+            grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.CatTitle))) { Name = "Titel" });
+            grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.CatString))) { Name = "String" });
+            grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.AddedWho))) { Name = "Angelegt von" });
+            grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.AddedWhen))) { Name = "Angelegt am" });
+            grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.ChangedWho))) { Name = "Geändert von" });
+            grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.ChangedWhen))) { Name = "Geändert am" });
+
+            dashboard.Items.Add(grid);
+
+            var layoutGroup = new DashboardLayoutGroup { Orientation = DashboardLayoutGroupOrientation.Vertical };
+            layoutGroup.ChildNodes.Add(new DashboardLayoutItem(grid));
+            dashboard.LayoutRoot = layoutGroup;
+
+            dashboard.SaveToXml(catalogsGridDashboardPath);
+        }
+
+        DashboardConfigurator configurator = new DashboardConfigurator();
+
+        var connectionString = configuration.GetConnectionString("DefaultConnection") ?? string.Empty;
+        var notifier = serviceProvider.GetRequiredService<IDashboardChangeNotifier>();
+        var dashboardStorage = new SqlDashboardStorage(connectionString, "TBDD_SMF_CONFIG", notifier: notifier);
+        configurator.SetDashboardStorage(dashboardStorage);
+
+        DataSourceInMemoryStorage dataSourceStorage = new DataSourceInMemoryStorage();
+        DashboardJsonDataSource jsonDataSourceUrl = new DashboardJsonDataSource("JSON Data Source (URL)");
+        jsonDataSourceUrl.JsonSource = new UriJsonSource(
+                new Uri("https://raw.githubusercontent.com/DevExpress-Examples/DataSources/master/JSON/customers.json"));
+        jsonDataSourceUrl.RootElement = "Customers";
+        dataSourceStorage.RegisterDataSource("jsonDataSourceUrl", jsonDataSourceUrl.SaveToXml());
+
+        var catalogsJsonDataSource = new DashboardJsonDataSource("Catalogs (API)")
+        {
+            ComponentName = "catalogsDataSource",
+            JsonSource = new UriJsonSource(new Uri($"{dashboardBaseUrl}/api/catalogs"))
+        };
+        dataSourceStorage.RegisterDataSource(catalogsJsonDataSource.ComponentName, catalogsJsonDataSource.SaveToXml());
+        dataSourceStorage.RegisterDataSource(catalogsJsonDataSource.Name, catalogsJsonDataSource.SaveToXml());
+
+        configurator.SetDataSourceStorage(dataSourceStorage);
+
+        EnsureDashboardInStorage(dashboardStorage, "DefaultDashboard", defaultDashboardPath);
+        EnsureDashboardInStorage(dashboardStorage, "CatalogsGrid", catalogsGridDashboardPath);
+
+        return configurator;
+    }
+
+    private static void EnsureDashboardInStorage(IEditableDashboardStorage storage, string id, string filePath)
+    {
+        var exists = storage.GetAvailableDashboardsInfo().Any(info => string.Equals(info.ID, id, StringComparison.OrdinalIgnoreCase));
+        if (exists || !File.Exists(filePath))
+        {
+            return;
+        }
+
+        var doc = XDocument.Load(filePath);
+        storage.AddDashboard(doc, id);
+    }
+}
--- a/DbFirst.API/Dashboards/IDashboardChangeNotifier.cs
+++ b/DbFirst.API/Dashboards/IDashboardChangeNotifier.cs
@@ -2,5 +2,5 @@ namespace DbFirst.API.Dashboards;

 public interface IDashboardChangeNotifier
 {
-    void NotifyChanged();
+    Task NotifyChangedAsync();
 }
--- a/DbFirst.API/Dashboards/SqlDashboardStorage.cs
+++ b/DbFirst.API/Dashboards/SqlDashboardStorage.cs
@@ -1,8 +1,8 @@
+using DevExpress.DashboardWeb;
+using Microsoft.Data.SqlClient;
 using System.Data;
 using System.Text;
 using System.Xml.Linq;
-using DevExpress.DashboardWeb;
-using Microsoft.Data.SqlClient;

 namespace DbFirst.API.Dashboards;

@@ -100,7 +100,7 @@ public sealed class SqlDashboardStorage : IEditableDashboardStorage

        connection.Open();
        command.ExecuteNonQuery();
-        _notifier?.NotifyChanged();
+        _ = _notifier?.NotifyChangedAsync();
        return id;
    }

@@ -122,7 +122,7 @@ public sealed class SqlDashboardStorage : IEditableDashboardStorage
            throw new ArgumentException($"Dashboard '{dashboardId}' not found.");
        }

-        _notifier?.NotifyChanged();
+        _ = _notifier?.NotifyChangedAsync();
    }

    public void DeleteDashboard(string dashboardId)
@@ -133,6 +133,6 @@ public sealed class SqlDashboardStorage : IEditableDashboardStorage

        connection.Open();
        command.ExecuteNonQuery();
-        _notifier?.NotifyChanged();
+        _ = _notifier?.NotifyChangedAsync();
    }
 }
--- a/DbFirst.API/DbFirst.API.csproj
+++ b/DbFirst.API/DbFirst.API.csproj
@@ -7,8 +7,7 @@
  </PropertyGroup>

  <ItemGroup>
-    <PackageReference Include="AutoMapper" Version="12.0.1" />
-    <PackageReference Include="AutoMapper.Extensions.Microsoft.DependencyInjection" Version="12.0.1" />
+    <PackageReference Include="AutoMapper" Version="16.1.1" />
    <PackageReference Include="DevExpress.AspNetCore.Dashboard" Version="25.2.3" />
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.22" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.22" />
@@ -17,7 +16,6 @@
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
-    <PackageReference Include="MediatR.Extensions.Microsoft.DependencyInjection" Version="11.1.0" />
  </ItemGroup>

  <ItemGroup>
--- a/DbFirst.API/Middleware/ExceptionHandlingMiddleware.cs
+++ b/DbFirst.API/Middleware/ExceptionHandlingMiddleware.cs
@@ -1,5 +1,4 @@
-using System.Net;
-using System.Text.Json;
+using Microsoft.AspNetCore.Mvc;

 namespace DbFirst.API.Middleware;

@@ -20,33 +19,35 @@ public class ExceptionHandlingMiddleware
        {
            await _next(context);
        }
+        catch (InvalidOperationException ex)
+        {
+            _logger.LogWarning(ex, "Domain validation error");
+            await WriteProblemAsync(context, StatusCodes.Status400BadRequest, "Eingabe ungültig", ex.Message);
+        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Unhandled exception");
-            await WriteProblemDetailsAsync(context, ex);
+            await WriteProblemAsync(context, StatusCodes.Status500InternalServerError, "Serverfehler", ex.Message);
        }
    }

-    private static async Task WriteProblemDetailsAsync(HttpContext context, Exception ex)
+    private static async Task WriteProblemAsync(HttpContext context, int status, string title, string detail)
    {
-        if (context.Response.HasStarted)
-        {
-            throw ex;
-        }
+        if (context.Response.HasStarted) return;

        context.Response.Clear();
-        context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
-        context.Response.ContentType = "application/json";
+        context.Response.StatusCode = status;
+        context.Response.ContentType = "application/problem+json";

-        var problem = new
+        var problem = new ProblemDetails
        {
-            type = "https://tools.ietf.org/html/rfc9110#section-15.6.1",
-            title = "Serverfehler",
-            status = context.Response.StatusCode,
-            detail = ex.Message,
-            traceId = context.TraceIdentifier
+            Type = $"https://tools.ietf.org/html/rfc9110#section-{(status == 400 ? "15.5.1" : "15.6.1")}",
+            Title = title,
+            Status = status,
+            Detail = detail,
+            Extensions = { ["traceId"] = context.TraceIdentifier }
        };

-        await context.Response.WriteAsync(JsonSerializer.Serialize(problem));
+        await context.Response.WriteAsJsonAsync(problem);
    }
 }
--- a/DbFirst.API/Program.cs
+++ b/DbFirst.API/Program.cs
@@ -1,18 +1,11 @@
-using DbFirst.API.Middleware;
 using DbFirst.API.Dashboards;
 using DbFirst.API.Hubs;
+using DbFirst.API.Middleware;
 using DbFirst.Application;
-using DbFirst.Application.Repositories;
-using DbFirst.Domain;
-using DbFirst.Domain.Entities;
 using DbFirst.Infrastructure;
-using DbFirst.Infrastructure.Repositories;
 using DevExpress.AspNetCore;
 using DevExpress.DashboardAspNetCore;
-using DevExpress.DashboardCommon;
 using DevExpress.DashboardWeb;
-using DevExpress.DataAccess.Json;
-using System.Xml.Linq;

 var builder = WebApplication.CreateBuilder(args);

@@ -20,6 +13,7 @@ var builder = WebApplication.CreateBuilder(args);
 builder.Services.AddControllers();
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
+builder.Services.AddProblemDetails();

 // TODO: allow listed origins configured in appsettings.json
 // In any case, dont let them to free to use without cors. if there is no origin specified, block all.
@@ -36,7 +30,7 @@ builder.Services.AddCors(options =>
        }
        else
        {
-            var origins = builder.Configuration.GetSection("Cors:AllowedOrigins").Get<string[]>() ?? Array.Empty<string>();
+            var origins = builder.Configuration.GetSection("Cors:AllowedOrigins").Get<string[]>() ?? [];
            if (origins.Length > 0)
            {
                policy.WithOrigins(origins)
@@ -51,98 +45,11 @@ builder.Services.AddCors(options =>
 builder.Services.AddInfrastructure(builder.Configuration);
 builder.Services.AddApplication();

-builder.Services.AddScoped<ICatalogRepository, CatalogRepository>();
-builder.Services.AddScoped<IMassDataRepository, MassDataRepository>();
-builder.Services.AddScoped<ILayoutRepository, LayoutRepository>();
-
 builder.Services.AddDevExpressControls();
 builder.Services.AddSignalR();
 builder.Services.AddSingleton<IDashboardChangeNotifier, DashboardChangeNotifier>();
-builder.Services.AddScoped<DashboardConfigurator>((IServiceProvider serviceProvider) => {
-    var dashboardsPath = Path.Combine(builder.Environment.ContentRootPath, "Data", "Dashboards");
-    Directory.CreateDirectory(dashboardsPath);
-
-    var defaultDashboardPath = Path.Combine(dashboardsPath, "DefaultDashboard.xml");
-    if (!File.Exists(defaultDashboardPath))
-    {
-        var defaultDashboard = new Dashboard();
-        defaultDashboard.Title.Text = "Default Dashboard";
-        defaultDashboard.SaveToXml(defaultDashboardPath);
-    }
-
-    var dashboardBaseUrl = builder.Configuration["Dashboard:BaseUrl"]
-        ?? builder.Configuration["ApiBaseUrl"]
-        ?? builder.Configuration["ASPNETCORE_URLS"]?.Split(';', StringSplitOptions.RemoveEmptyEntries).FirstOrDefault()
-        ?? "https://localhost:7204";
-
-    dashboardBaseUrl = dashboardBaseUrl.TrimEnd('/');
-
-    var catalogsGridDashboardPath = Path.Combine(dashboardsPath, "CatalogsGrid.xml");
-    if (!File.Exists(catalogsGridDashboardPath))
-    {
-        var dashboard = new Dashboard();
-        dashboard.Title.Text = "Catalogs (Dashboard Grid)";
-
-        var catalogDataSource = new DashboardJsonDataSource("Catalogs (API)")
-        {
-            ComponentName = "catalogsDataSource",
-            JsonSource = new UriJsonSource(new Uri($"{dashboardBaseUrl}/api/catalogs"))
-        };
-
-        dashboard.DataSources.Add(catalogDataSource);
-
-        var grid = new GridDashboardItem
-        {
-            DataSource = catalogDataSource,
-            Name = "Catalogs"
-        };
-
-        grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.Guid))) { Name = "Id" });
-        grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.CatTitle))) { Name = "Titel" });
-        grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.CatString))) { Name = "String" });
-        grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.AddedWho))) { Name = "Angelegt von" });
-        grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.AddedWhen))) { Name = "Angelegt am" });
-        grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.ChangedWho))) { Name = "Geändert von" });
-        grid.Columns.Add(new GridDimensionColumn(new Dimension(nameof(VwmyCatalog.ChangedWhen))) { Name = "Geändert am" });
-
-        dashboard.Items.Add(grid);
-
-        var layoutGroup = new DashboardLayoutGroup { Orientation = DashboardLayoutGroupOrientation.Vertical };
-        layoutGroup.ChildNodes.Add(new DashboardLayoutItem(grid));
-        dashboard.LayoutRoot = layoutGroup;
-
-        dashboard.SaveToXml(catalogsGridDashboardPath);
-    }
-
-    DashboardConfigurator configurator = new DashboardConfigurator();
-
-    var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? string.Empty;
-    var notifier = serviceProvider.GetRequiredService<IDashboardChangeNotifier>();
-    var dashboardStorage = new SqlDashboardStorage(connectionString, "TBDD_SMF_CONFIG", notifier: notifier);
-    configurator.SetDashboardStorage(dashboardStorage);
-
-    DataSourceInMemoryStorage dataSourceStorage = new DataSourceInMemoryStorage();
-    DashboardJsonDataSource jsonDataSourceUrl = new DashboardJsonDataSource("JSON Data Source (URL)");
-    jsonDataSourceUrl.JsonSource = new UriJsonSource(
-            new Uri("https://raw.githubusercontent.com/DevExpress-Examples/DataSources/master/JSON/customers.json"));
-    jsonDataSourceUrl.RootElement = "Customers";
-    dataSourceStorage.RegisterDataSource("jsonDataSourceUrl", jsonDataSourceUrl.SaveToXml());
-
-    var catalogsJsonDataSource = new DashboardJsonDataSource("Catalogs (API)")
-    {
-        ComponentName = "catalogsDataSource",
-        JsonSource = new UriJsonSource(new Uri($"{dashboardBaseUrl}/api/catalogs"))
-    };
-    dataSourceStorage.RegisterDataSource(catalogsJsonDataSource.ComponentName, catalogsJsonDataSource.SaveToXml());
-    dataSourceStorage.RegisterDataSource(catalogsJsonDataSource.Name, catalogsJsonDataSource.SaveToXml());
-
-    configurator.SetDataSourceStorage(dataSourceStorage);
-
-    EnsureDashboardInStorage(dashboardStorage, "DefaultDashboard", defaultDashboardPath);
-    EnsureDashboardInStorage(dashboardStorage, "CatalogsGrid", catalogsGridDashboardPath);
-
-    return configurator;
-});
+builder.Services.AddScoped<DashboardConfigurator>(sp =>
+    DashboardConfiguratorFactory.Create(sp, builder.Configuration, builder.Environment));

 var app = builder.Build();

@@ -164,16 +71,4 @@ app.MapDashboardRoute("api/dashboard", "DefaultDashboard");
 app.MapHub<DashboardsHub>("/hubs/dashboards");
 app.MapControllers();

-app.Run();
-
-static void EnsureDashboardInStorage(IEditableDashboardStorage storage, string id, string filePath)
-{
-    var exists = storage.GetAvailableDashboardsInfo().Any(info => string.Equals(info.ID, id, StringComparison.OrdinalIgnoreCase));
-    if (exists || !File.Exists(filePath))
-    {
-        return;
-    }
-
-    var doc = XDocument.Load(filePath);
-    storage.AddDashboard(doc, id);
-}
+app.Run();
--- a/DbFirst.Application/Catalogs/CatalogProfile.cs
+++ b/DbFirst.Application/Catalogs/CatalogProfile.cs
@@ -1,4 +1,5 @@
 using AutoMapper;
+using DbFirst.Contracts.Catalogs;
 using DbFirst.Domain.Entities;

 namespace DbFirst.Application.Catalogs;
--- a/DbFirst.Application/Catalogs/CatalogReadDto.cs
+++ b/DbFirst.Application/Catalogs/CatalogReadDto.cs
@@ -1,12 +0,0 @@
-namespace DbFirst.Application.Catalogs;
-
-public class CatalogReadDto
-{
-    public int Guid { get; set; }
-    public string CatTitle { get; set; } = null!;
-    public string CatString { get; set; } = null!;
-    public string AddedWho { get; set; } = null!;
-    public DateTime AddedWhen { get; set; }
-    public string? ChangedWho { get; set; }
-    public DateTime? ChangedWhen { get; set; }
-}
--- a/DbFirst.Application/Catalogs/CatalogWriteDto.cs
+++ b/DbFirst.Application/Catalogs/CatalogWriteDto.cs
@@ -1,10 +0,0 @@
-using DbFirst.Domain;
-
-namespace DbFirst.Application.Catalogs;
-
-public class CatalogWriteDto
-{
-    public string CatTitle { get; set; } = null!;
-    public string CatString { get; set; } = null!;
-    public CatalogUpdateProcedure UpdateProcedure { get; set; } = CatalogUpdateProcedure.Update;
-}
--- a/DbFirst.Application/Catalogs/Commands/CreateCatalogCommand.cs
+++ b/DbFirst.Application/Catalogs/Commands/CreateCatalogCommand.cs
@@ -1,3 +1,4 @@
+using DbFirst.Contracts.Catalogs;
 using MediatR;

 namespace DbFirst.Application.Catalogs.Commands;
--- a/DbFirst.Application/Catalogs/Commands/CreateCatalogHandler.cs
+++ b/DbFirst.Application/Catalogs/Commands/CreateCatalogHandler.cs
@@ -1,5 +1,6 @@
 using AutoMapper;
 using DbFirst.Application.Repositories;
+using DbFirst.Contracts.Catalogs;
 using DbFirst.Domain.Entities;
 using MediatR;

--- a/DbFirst.Application/Catalogs/Commands/UpdateCatalogCommand.cs
+++ b/DbFirst.Application/Catalogs/Commands/UpdateCatalogCommand.cs
@@ -1,3 +1,4 @@
+using DbFirst.Contracts.Catalogs;
 using MediatR;

 namespace DbFirst.Application.Catalogs.Commands;
--- a/DbFirst.Application/Catalogs/Commands/UpdateCatalogHandler.cs
+++ b/DbFirst.Application/Catalogs/Commands/UpdateCatalogHandler.cs
@@ -1,7 +1,8 @@
 using AutoMapper;
 using DbFirst.Application.Repositories;
-using DbFirst.Domain.Entities;
+using DbFirst.Contracts.Catalogs;
 using DbFirst.Domain;
+using DbFirst.Domain.Entities;
 using MediatR;

 namespace DbFirst.Application.Catalogs.Commands;
@@ -25,18 +26,20 @@ public class UpdateCatalogHandler : IRequestHandler<UpdateCatalogCommand, Catalo
            return null;
        }

+        if (request.Dto.UpdateProcedure == CatalogUpdateProcedure.Update &&
+            !string.Equals(existing.CatTitle, request.Dto.CatTitle, StringComparison.OrdinalIgnoreCase))
+        {
+            throw new InvalidOperationException("Titel kann nicht geändert werden.");
+        }
+
        var entity = _mapper.Map<VwmyCatalog>(request.Dto);
        entity.Guid = request.Id;
-        entity.CatTitle = request.Dto.UpdateProcedure == CatalogUpdateProcedure.Update
-            ? existing.CatTitle
-            : request.Dto.CatTitle;
        entity.AddedWho = existing.AddedWho;
        entity.AddedWhen = existing.AddedWhen;
        entity.ChangedWho = "system";
        entity.ChangedWhen = DateTime.UtcNow;

-        var procedure = request.Dto.UpdateProcedure;
-        var updated = await _repository.UpdateAsync(request.Id, entity, procedure, cancellationToken);
+        var updated = await _repository.UpdateAsync(request.Id, entity, request.Dto.UpdateProcedure, cancellationToken);
        return updated == null ? null : _mapper.Map<CatalogReadDto>(updated);
    }
 }
--- a/DbFirst.Application/Catalogs/Queries/GetAllCatalogsHandler.cs
+++ b/DbFirst.Application/Catalogs/Queries/GetAllCatalogsHandler.cs
@@ -1,5 +1,6 @@
 using AutoMapper;
 using DbFirst.Application.Repositories;
+using DbFirst.Contracts.Catalogs;
 using MediatR;

 namespace DbFirst.Application.Catalogs.Queries;
--- a/DbFirst.Application/Catalogs/Queries/GetAllCatalogsQuery.cs
+++ b/DbFirst.Application/Catalogs/Queries/GetAllCatalogsQuery.cs
@@ -1,3 +1,4 @@
+using DbFirst.Contracts.Catalogs;
 using MediatR;

 namespace DbFirst.Application.Catalogs.Queries;
--- a/DbFirst.Application/Catalogs/Queries/GetCatalogByIdHandler.cs
+++ b/DbFirst.Application/Catalogs/Queries/GetCatalogByIdHandler.cs
@@ -1,5 +1,6 @@
 using AutoMapper;
 using DbFirst.Application.Repositories;
+using DbFirst.Contracts.Catalogs;
 using MediatR;

 namespace DbFirst.Application.Catalogs.Queries;
--- a/DbFirst.Application/Catalogs/Queries/GetCatalogByIdQuery.cs
+++ b/DbFirst.Application/Catalogs/Queries/GetCatalogByIdQuery.cs
@@ -1,3 +1,4 @@
+using DbFirst.Contracts.Catalogs;
 using MediatR;

 namespace DbFirst.Application.Catalogs.Queries;
--- a/DbFirst.Application/DbFirst.Application.csproj
+++ b/DbFirst.Application/DbFirst.Application.csproj
@@ -7,14 +7,18 @@
  </PropertyGroup>

  <ItemGroup>
-    <PackageReference Include="AutoMapper" Version="12.0.1" />
-    <PackageReference Include="AutoMapper.Extensions.Microsoft.DependencyInjection" Version="12.0.1" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.2" />
-    <PackageReference Include="MediatR.Extensions.Microsoft.DependencyInjection" Version="11.1.0" />
+    <PackageReference Include="AutoMapper" Version="16.1.1" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.0" />
+	<PackageReference Include="MediatR" Version="14.1.0" />
  </ItemGroup>

  <ItemGroup>
+    <ProjectReference Include="..\DbFirst.Contracts\DbFirst.Contracts.csproj" />
    <ProjectReference Include="..\DbFirst.Domain\DbFirst.Domain.csproj" />
  </ItemGroup>

+  <ItemGroup>
+    <Folder Include="Layouts\" />
+  </ItemGroup>
+
 </Project>
--- a/DbFirst.Application/DependencyInjection.cs
+++ b/DbFirst.Application/DependencyInjection.cs
@@ -1,5 +1,4 @@
 using Microsoft.Extensions.DependencyInjection;
-using MediatR;

 namespace DbFirst.Application;

@@ -7,8 +6,9 @@ public static class DependencyInjection
 {
    public static IServiceCollection AddApplication(this IServiceCollection services)
    {
-        services.AddAutoMapper(typeof(DependencyInjection).Assembly);
-        services.AddMediatR(typeof(DependencyInjection).Assembly);
+        services.AddAutoMapper(cfg => cfg.AddMaps(typeof(DependencyInjection).Assembly));
+        services.AddMediatR(cfg =>
+    cfg.RegisterServicesFromAssembly(typeof(DependencyInjection).Assembly));
        return services;
    }
 }
--- a/DbFirst.Application/MassData/Commands/UpsertMassDataByCustomerNameCommand.cs
+++ b/DbFirst.Application/MassData/Commands/UpsertMassDataByCustomerNameCommand.cs
@@ -1,3 +1,4 @@
+using DbFirst.Contracts.MassData;
 using MediatR;

 namespace DbFirst.Application.MassData.Commands;
--- a/DbFirst.Application/MassData/Commands/UpsertMassDataByCustomerNameHandler.cs
+++ b/DbFirst.Application/MassData/Commands/UpsertMassDataByCustomerNameHandler.cs
@@ -1,5 +1,6 @@
 using AutoMapper;
 using DbFirst.Application.Repositories;
+using DbFirst.Contracts.MassData;
 using MediatR;

 namespace DbFirst.Application.MassData.Commands;
--- a/DbFirst.Application/MassData/MassDataProfile.cs
+++ b/DbFirst.Application/MassData/MassDataProfile.cs
@@ -1,4 +1,5 @@
 using AutoMapper;
+using DbFirst.Contracts.MassData;
 using DbFirst.Domain.Entities;

 namespace DbFirst.Application.MassData;
--- a/DbFirst.Application/MassData/MassDataReadDto.cs
+++ b/DbFirst.Application/MassData/MassDataReadDto.cs
@@ -1,12 +0,0 @@
-namespace DbFirst.Application.MassData;
-
-public class MassDataReadDto
-{
-    public int Id { get; set; }
-    public string CustomerName { get; set; } = string.Empty;
-    public decimal Amount { get; set; }
-    public string Category { get; set; } = string.Empty;
-    public bool StatusFlag { get; set; }
-    public DateTime AddedWhen { get; set; }
-    public DateTime? ChangedWhen { get; set; }
-}
--- a/DbFirst.Application/MassData/MassDataWriteDto.cs
+++ b/DbFirst.Application/MassData/MassDataWriteDto.cs
@@ -1,9 +0,0 @@
-namespace DbFirst.Application.MassData;
-
-public class MassDataWriteDto
-{
-    public string CustomerName { get; set; } = string.Empty;
-    public decimal Amount { get; set; }
-    public string Category { get; set; } = string.Empty;
-    public bool StatusFlag { get; set; }
-}
--- a/DbFirst.Application/MassData/Queries/GetAllMassDataHandler.cs
+++ b/DbFirst.Application/MassData/Queries/GetAllMassDataHandler.cs
@@ -1,5 +1,6 @@
 using AutoMapper;
 using DbFirst.Application.Repositories;
+using DbFirst.Contracts.MassData;
 using MediatR;

 namespace DbFirst.Application.MassData.Queries;
--- a/DbFirst.Application/MassData/Queries/GetAllMassDataQuery.cs
+++ b/DbFirst.Application/MassData/Queries/GetAllMassDataQuery.cs
@@ -1,3 +1,4 @@
+using DbFirst.Contracts.MassData;
 using MediatR;

 namespace DbFirst.Application.MassData.Queries;
--- a/DbFirst.Application/MassData/Queries/GetMassDataByCustomerNameHandler.cs
+++ b/DbFirst.Application/MassData/Queries/GetMassDataByCustomerNameHandler.cs
@@ -1,5 +1,6 @@
 using AutoMapper;
 using DbFirst.Application.Repositories;
+using DbFirst.Contracts.MassData;
 using MediatR;

 namespace DbFirst.Application.MassData.Queries;
--- a/DbFirst.Application/MassData/Queries/GetMassDataByCustomerNameQuery.cs
+++ b/DbFirst.Application/MassData/Queries/GetMassDataByCustomerNameQuery.cs
@@ -1,3 +1,4 @@
+using DbFirst.Contracts.MassData;
 using MediatR;

 namespace DbFirst.Application.MassData.Queries;
--- a/DbFirst.BlazorWebApp/AppSettings.cs
+++ b/DbFirst.BlazorWebApp/AppSettings.cs
@@ -0,0 +1,6 @@
+namespace DbFirst.BlazorWebApp;
+
+public class AppSettings
+{
+    public string ApiBaseUrl { get; set; } = string.Empty;
+}
--- a/DbFirst.BlazorWebApp/Components/App.razor
+++ b/DbFirst.BlazorWebApp/Components/App.razor
@@ -18,11 +18,20 @@
    <link href="_content/DevExpress.Blazor.Dashboard/dx-dashboard.light.min.css" rel="stylesheet" />

    <link rel="stylesheet" href="bootstrap/bootstrap.min.css" />
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css" />

    <link rel="stylesheet" href="app.css" />
    <link rel="stylesheet" href="DbFirst.BlazorWebApp.styles.css" />
    <link rel="icon" type="image/png" href="favicon.png" />
    <script src="js/size-manager.js"></script>
+    <script>
+        window.setDxDarkOverride = function (enabled) {
+            if (enabled)
+                document.documentElement.classList.add('dx-dark');
+            else
+                document.documentElement.classList.remove('dx-dark');
+        };
+    </script>
    <HeadOutlet />
 </head>

--- a/DbFirst.BlazorWebApp/Components/BandGridBase.cs
+++ b/DbFirst.BlazorWebApp/Components/BandGridBase.cs
@@ -2,6 +2,7 @@
 using DbFirst.BlazorWebApp.Services;
 using DevExpress.Blazor;
 using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components.Forms;
 using Microsoft.AspNetCore.Components.Rendering;

 namespace DbFirst.BlazorWebApp.Components;
@@ -27,6 +28,15 @@ public abstract class BandGridBase<TItem> : ComponentBase
    protected SizeMode _sizeMode = SizeMode.Medium;
    protected static readonly List<SizeMode> _sizeModes = Enum.GetValues<SizeMode>().ToList();

+    protected string? errorMessage;
+    protected string? infoMessage;
+    protected bool isLoading;
+    protected bool hasLoaded;
+    protected EditContext? editContext;
+    protected ValidationMessageStore? validationMessageStore;
+    protected string popupHeaderText = "Edit";
+    protected int _focusedVisibleIndex;
+
    private const string LayoutType = "GRID_BANDS";

    // --- Lifecycle ---
@@ -103,6 +113,8 @@ public abstract class BandGridBase<TItem> : ComponentBase
    // --- Band-Methoden ---
    protected bool CanSaveBandLayout => !string.IsNullOrWhiteSpace(layoutUser);

+    protected virtual bool ShowCommandColumn => true;
+
    protected void AddBand()
    {
        bandLayout.Bands.Add(new BandDefinition { Id = Guid.NewGuid().ToString("N"), Caption = "Band" });
@@ -145,12 +157,12 @@ public abstract class BandGridBase<TItem> : ComponentBase
                .Select(c => c.FieldName)
                .ToList();
        }
-        StateHasChanged();
+        _ = InvokeAsync(StateHasChanged);
    }

    protected void UpdateBandOptions()
    {
-        bandOptions = new List<BandOption> { new() { Id = string.Empty, Caption = "Ohne Band" } };
+        bandOptions = [new() { Id = string.Empty, Caption = "Ohne Band" }];
        bandOptions.AddRange(bandLayout.Bands.Select(b => new BandOption { Id = b.Id, Caption = b.Caption }));
    }

@@ -172,9 +184,12 @@ public abstract class BandGridBase<TItem> : ComponentBase
    protected RenderFragment RenderColumns() => builder =>
    {
        var seq = 0;
-        builder.OpenComponent<DxGridCommandColumn>(seq++);
-        builder.AddAttribute(seq++, "Width", "120px");
-        builder.CloseComponent();
+        if (ShowCommandColumn)
+        {
+            builder.OpenComponent<DxGridCommandColumn>(seq++);
+            builder.AddAttribute(seq++, "Width", "120px");
+            builder.CloseComponent();
+        }

        var grouped = bandLayout.Bands.SelectMany(b => b.Columns).ToHashSet(StringComparer.OrdinalIgnoreCase);
        foreach (var column in ColumnDefinitions.Where(c => !grouped.Contains(c.FieldName)))
@@ -211,4 +226,53 @@ public abstract class BandGridBase<TItem> : ComponentBase
            builder.AddAttribute(seq++, "ReadOnly", true);
        builder.CloseComponent();
    }
+
+    protected void SetEditContext(EditContext context)
+    {
+        if (editContext == context) return;
+        if (editContext != null)
+            editContext.OnFieldChanged -= OnEditFieldChanged;
+        editContext = context;
+        validationMessageStore = new ValidationMessageStore(editContext);
+        editContext.OnFieldChanged += OnEditFieldChanged;
+    }
+
+    protected virtual void OnEditFieldChanged(object? sender, FieldChangedEventArgs e)
+    {
+        validationMessageStore?.Clear();
+        editContext?.NotifyValidationStateChanged();
+    }
+
+    protected void SetPopupHeaderText(bool isNew) => popupHeaderText = isNew ? "Neu" : "Edit";
+
+    protected async Task EditFocusedRow()
+        => await gridRef!.StartEditRowAsync(_focusedVisibleIndex);
+
+    protected Task DeleteFocusedRow()
+    {
+        gridRef!.ShowRowDeleteConfirmation(_focusedVisibleIndex);
+        return Task.CompletedTask;
+    }
+
+    protected async Task SaveLayoutWithFeedbackAsync()
+    {
+        try
+        {
+            await SaveLayoutAsync();
+            infoMessage = "Layout gespeichert.";
+            errorMessage = null;
+        }
+        catch (Exception ex)
+        {
+            errorMessage = $"Layout konnte nicht gespeichert werden: {ex.Message}";
+        }
+    }
+
+    protected async Task ResetLayoutWithFeedbackAsync()
+    {
+        await ResetLayoutAsync();
+        infoMessage = "Layout zurückgesetzt.";
+        errorMessage = null;
+    }
+
 }
--- a/DbFirst.BlazorWebApp/Components/CatalogsGrid.razor
+++ b/DbFirst.BlazorWebApp/Components/CatalogsGrid.razor
@@ -1,5 +1,5 @@
@inherits BandGridBase<CatalogReadDto>
-@inject CatalogApiClient Api
+@inject ICatalogApiClient Api

@if (!string.IsNullOrWhiteSpace(errorMessage))
 {
@@ -38,6 +38,7 @@ else

    <div class="grid-section">
        <DxGrid Data="@items"
+                ColumnChooserButtonDisplayMode="GridColumnChooserButtonDisplayMode.Always"
                TItem="CatalogReadDto"
                KeyFieldName="@nameof(CatalogReadDto.Guid)"
                SizeMode="@_sizeMode"
@@ -58,9 +59,42 @@ else
                DataItemDeleting="OnDataItemDeleting"
                FocusedRowEnabled="true"
                @bind-FocusedRowKey="focusedRowKey"
+                RowClick="@(args => _focusedVisibleIndex = args.VisibleIndex)"
                @ref="gridRef">
            <ToolbarTemplate>
                <DxToolbar>
+                    <DxToolbarItem Alignment="ToolbarItemAlignment.Left">
+                        <Template Context="_">
+                            <DxButton IconCssClass="bi bi-plus-lg"
+                                      RenderStyle="ButtonRenderStyle.Secondary"
+                                      RenderStyleMode="ButtonRenderStyleMode.Text"
+                                      Click="@(() => gridRef!.StartEditNewRowAsync())" />
+                        </Template>
+                    </DxToolbarItem>
+                    <DxToolbarItem Alignment="ToolbarItemAlignment.Left">
+                        <Template Context="_">
+                            <DxButton IconCssClass="bi bi-pencil"
+                                      RenderStyle="ButtonRenderStyle.Secondary"
+                                      RenderStyleMode="ButtonRenderStyleMode.Text"
+                                      Click="EditFocusedRow" />
+                        </Template>
+                    </DxToolbarItem>
+                    <DxToolbarItem Alignment="ToolbarItemAlignment.Left">
+                        <Template Context="_">
+                            <DxButton IconCssClass="bi bi-trash"
+                                      RenderStyle="ButtonRenderStyle.Secondary"
+                                      RenderStyleMode="ButtonRenderStyleMode.Text"
+                                      Click="DeleteFocusedRow" />
+                        </Template>
+                    </DxToolbarItem>
+                    <DxToolbarItem Alignment="ToolbarItemAlignment.Right">
+                        <Template Context="_">
+                            <DxButton Text="Spalten"
+                                      RenderStyle="ButtonRenderStyle.Secondary"
+                                      RenderStyleMode="ButtonRenderStyleMode.Text"
+                                      Click="@(() => gridRef!.ShowColumnChooser())" />
+                        </Template>
+                    </DxToolbarItem>
                    <DxToolbarItem Alignment="ToolbarItemAlignment.Right">
                        <Template Context="_">
                            <DxDropDownButton Text="@FormatSizeText(_sizeMode)"
@@ -115,16 +149,10 @@ else

@code {
    private List<CatalogReadDto> items = new();
-    private bool isLoading;
-    private bool hasLoaded;
-    private string? errorMessage;
-    private string? infoMessage;
-    private EditContext? editContext;
-    private ValidationMessageStore? validationMessageStore;
    private int? focusedRowKey;
-    private string popupHeaderText = "Edit";

    protected override string LayoutKey => "CatalogsGrid";
+    protected override bool ShowCommandColumn => false;

    protected override List<ColumnDefinition> ColumnDefinitions { get; } = new()
 {
@@ -174,17 +202,7 @@ else
        }
    }

-    private void SetEditContext(EditContext context)
-    {
-        if (editContext == context) return;
-        if (editContext != null)
-            editContext.OnFieldChanged -= OnEditFieldChanged;
-        editContext = context;
-        validationMessageStore = new ValidationMessageStore(editContext);
-        editContext.OnFieldChanged += OnEditFieldChanged;
-    }
-
-    private void OnEditFieldChanged(object? sender, FieldChangedEventArgs e)
+    protected override void OnEditFieldChanged(object? sender, FieldChangedEventArgs e)
    {
        if (validationMessageStore == null || editContext == null) return;

@@ -202,8 +220,6 @@ else
        }
    }

-    private void SetPopupHeaderText(bool isNew) => popupHeaderText = isNew ? "Neu" : "Edit";
-
    private void OnCustomizeEditModel(GridCustomizeEditModelEventArgs e)
    {
        popupHeaderText = e.IsNew ? "Neu" : "Edit";
@@ -243,7 +259,7 @@ else
        {
            CatTitle = editModel.CatTitle,
            CatString = editModel.CatString,
-            UpdateProcedure = editModel.UpdateProcedure
+            UpdateProcedure = (CatalogUpdateProcedure)editModel.UpdateProcedure
        };

        try
@@ -343,25 +359,4 @@ else
        public int Value { get; set; }
        public string Text { get; set; } = string.Empty;
    }
-
-    private async Task SaveLayoutWithFeedbackAsync()
-    {
-        try
-        {
-            await SaveLayoutAsync();
-            infoMessage = "Layout gespeichert.";
-            errorMessage = null;
-        }
-        catch (Exception ex)
-        {
-            errorMessage = $"Layout konnte nicht gespeichert werden: {ex.Message}";
-        }
-    }
-
-    private async Task ResetLayoutWithFeedbackAsync()
-    {
-        await ResetLayoutAsync();
-        infoMessage = "Layout zurückgesetzt.";
-        errorMessage = null;
-    }
 }
--- a/DbFirst.BlazorWebApp/Components/Layout/MainLayout.razor
+++ b/DbFirst.BlazorWebApp/Components/Layout/MainLayout.razor
@@ -1,15 +1,23 @@
@inherits LayoutComponentBase
@implements IDisposable
@inject ThemeState ThemeState
+@inject IJSRuntime JS

-<div class="page @(ThemeState.IsDarkMode ? "app-dark" : "app-light")">
+<div class="page @(ThemeState.IsDarkMode ? "app-dark" : "app-light") @(ThemeState.IsNativeDarkTheme ? "native-dark" : "")">
    <div class="sidebar">
        <NavMenu />
    </div>

    <main>
        <div class="top-row px-4">
-            <DxButton Text="@(ThemeState.IsDarkMode ? "Dark Mode aus" : "Dark Mode an")" Click="ToggleTheme" />
+            <DxComboBox Data="@ThemeState.AvailableThemes"
+                        Value="@ThemeState.CurrentThemeName"
+                        ValueChanged="@((string t) => ThemeState.SetTheme(t))"
+                        style="width: 130px;" />
+            <span style="margin-left: 12px;">
+                <DxButton Text="@(ThemeState.IsDarkMode ? "Dark Mode aus" : "Dark Mode an")"
+                          Click="ToggleTheme" />
+            </span>
            <a href="https://learn.microsoft.com/aspnet/core/" target="_blank">About</a>
        </div>

@@ -26,9 +34,43 @@
 </div>

@code {
+    private bool _isInteractive;
+
    protected override void OnInitialized()
    {
-        ThemeState.OnChange += StateHasChanged;
+        ThemeState.OnChange += OnThemeChanged;
+    }
+
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (firstRender)
+        {
+            _isInteractive = true;
+        }
+        await ApplyDxDarkOverrideAsync();
+    }
+
+    private async void OnThemeChanged()
+    {
+        StateHasChanged();
+        if (_isInteractive)
+        {
+            await ApplyDxDarkOverrideAsync();
+        }
+    }
+
+    private async Task ApplyDxDarkOverrideAsync()
+    {
+        if (!_isInteractive) return;
+        try
+        {
+            bool needsOverride = ThemeState.IsDarkMode && !ThemeState.IsNativeDarkTheme;
+            await JS.InvokeVoidAsync("setDxDarkOverride", needsOverride);
+        }
+        catch (JSException)
+        {
+            // JS-Funktion noch nicht verfügbar – kein Circuit-Crash
+        }
    }

    private void ToggleTheme()
@@ -38,6 +80,6 @@

    public void Dispose()
    {
-        ThemeState.OnChange -= StateHasChanged;
+        ThemeState.OnChange -= OnThemeChanged;
    }
 }
--- a/DbFirst.BlazorWebApp/Components/Layout/MainLayout.razor.css
+++ b/DbFirst.BlazorWebApp/Components/Layout/MainLayout.razor.css
@@ -18,11 +18,13 @@ main {
 }

 .sidebar {
-    background-image: linear-gradient(180deg, rgb(5, 39, 103) 0%, #3a0647 70%);
+    background-color: var(--dx-color-surface-container, #f4f4f4);
+    border-right: 1px solid var(--dx-color-outline-variant, #e0e0e0);
 }

 .page.app-dark .sidebar {
-    background-image: linear-gradient(180deg, #171717 0%, #0f2a46 70%);
+    background-color: var(--dx-color-surface-container, #1e1e1e);
+    border-right-color: var(--dx-color-outline-variant, #333);
 }

 .top-row {
--- a/DbFirst.BlazorWebApp/Components/Layout/NavMenu.razor
+++ b/DbFirst.BlazorWebApp/Components/Layout/NavMenu.razor
@@ -1,36 +1,24 @@
-<div class="top-row ps-3 navbar navbar-dark">
-    <div class="container-fluid">
-        <a class="navbar-brand" href="">DbFirst.BlazorWebApp</a>
-    </div>
+<div class="nav-brand-row">
+    <a class="nav-brand-link" href="">DbFirst</a>
+    <button class="nav-toggle-btn" @onclick="ToggleMenu" title="Navigation menu">&#9776;</button>
 </div>

-<input type="checkbox" title="Navigation menu" class="navbar-toggler" />
-
-<div class="nav-scrollable" onclick="document.querySelector('.navbar-toggler').click()">
-    <nav class="flex-column">
-        <div class="nav-item px-3">
-            <NavLink class="nav-link" href="" Match="NavLinkMatch.All">
-                <span class="bi bi-house-door-fill-nav-menu" aria-hidden="true"></span> Home
-            </NavLink>
-        </div>
-
-        <div class="nav-item px-3">
-            <NavLink class="nav-link" href="catalogs">
-                <span class="bi bi-collection-nav-menu" aria-hidden="true"></span> Catalogs
-            </NavLink>
-        </div>
-
-        <div class="nav-item px-3">
-            <NavLink class="nav-link" href="dashboards">
-                <span class="bi bi-speedometer-nav-menu" aria-hidden="true"></span> Dashboards
-            </NavLink>
-        </div>
-
-        <div class="nav-item px-3">
-            <NavLink class="nav-link" href="massdata">
-                <span class="bi bi-table-nav-menu" aria-hidden="true"></span> MassData
-            </NavLink>
-        </div>
-    </nav>
+<div class="nav-scrollable @(menuOpen ? "nav-open" : "")">
+    <DxTreeView CssClass="sidebar-tree">
+        <Nodes>
+            <DxTreeViewNode Text="Home" NavigateUrl="/" IconCssClass="dxi dxi-home" />
+            <DxTreeViewNode Text="Data Management" Expanded="true">
+                <Nodes>
+                    <DxTreeViewNode Text="Catalogs" NavigateUrl="/catalogs" IconCssClass="dxi dxi-folder" />
+                    <DxTreeViewNode Text="Dashboards" NavigateUrl="/dashboards" IconCssClass="dxi dxi-chart-bar" />
+                    <DxTreeViewNode Text="Mass Data" NavigateUrl="/massdata" IconCssClass="dxi dxi-table" />
+                </Nodes>
+            </DxTreeViewNode>
+        </Nodes>
+    </DxTreeView>
 </div>

+@code {
+    private bool menuOpen = false;
+    private void ToggleMenu() => menuOpen = !menuOpen;
+}
--- a/DbFirst.BlazorWebApp/Components/Layout/NavMenu.razor.css
+++ b/DbFirst.BlazorWebApp/Components/Layout/NavMenu.razor.css
@@ -1,117 +1,52 @@
-.navbar-toggler {
-    appearance: none;
-    cursor: pointer;
-    width: 3.5rem;
-    height: 2.5rem;
-    color: white;
-    position: absolute;
-    top: 0.5rem;
-    right: 1rem;
-    border: 1px solid rgba(255, 255, 255, 0.1);
-    background: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.55%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") no-repeat center/1.75rem rgba(255, 255, 255, 0.1);
-}
-
-.navbar-toggler:checked {
-    background-color: rgba(255, 255, 255, 0.5);
-}
-
-.top-row {
+.nav-brand-row {
    height: 3.5rem;
-    background-color: rgba(0,0,0,0.4);
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 0 1rem;
+    border-bottom: 1px solid rgba(0, 0, 0, 0.12);
 }

-.navbar-brand {
-    font-size: 1.1rem;
+.nav-brand-link {
+    font-size: 1.05rem;
+    font-weight: 600;
+    text-decoration: none;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
 }

-.bi {
-    display: inline-block;
-    position: relative;
-    width: 1.25rem;
-    height: 1.25rem;
-    margin-right: 0.75rem;
-    top: -1px;
-    background-size: cover;
-}
-
-.bi-house-door-fill-nav-menu {
-    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='white' class='bi bi-house-door-fill' viewBox='0 0 16 16'%3E%3Cpath d='M6.5 14.5v-3.505c0-.245.25-.495.5-.495h2c.25 0 .5.25.5.5v3.5a.5.5 0 0 0 .5.5h4a.5.5 0 0 0 .5-.5v-7a.5.5 0 0 0-.146-.354L13 5.793V2.5a.5.5 0 0 0-.5-.5h-1a.5.5 0 0 0-.5.5v1.293L8.354 1.146a.5.5 0 0 0-.708 0l-6 6A.5.5 0 0 0 1.5 7.5v7a.5.5 0 0 0 .5.5h4a.5.5 0 0 0 .5-.5Z'/%3E%3C/svg%3E");
-}
-
-.bi-plus-square-fill-nav-menu {
-    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='white' class='bi bi-plus-square-fill' viewBox='0 0 16 16'%3E%3Cpath d='M2 0a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V2a2 2 0 0 0-2-2H2zm6.5 4.5v3h3a.5.5 0 0 1 0 1h-3v3a.5.5 0 0 1-1 0v-3h-3a.5.5 0 0 1 0-1h3v-3a.5.5 0 0 1 1 0z'/%3E%3C/svg%3E");
-}
-
-.bi-list-nested-nav-menu {
-    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='white' class='bi bi-list-nested' viewBox='0 0 16 16'%3E%3Cpath fill-rule='evenodd' d='M4.5 11.5A.5.5 0 0 1 5 11h10a.5.5 0 0 1 0 1H5a.5.5 0 0 1-.5-.5zm-2-4A.5.5 0 0 1 3 7h10a.5.5 0 0 1 0 1H3a.5.5 0 0 1-.5-.5zm-2-4A.5.5 0 0 1 1 3h10a.5.5 0 0 1 0 1H1a.5.5 0 0 1-.5-.5z'/%3E%3C/svg%3E");
-}
-
-.bi-collection-nav-menu {
-    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='white' viewBox='0 0 16 16'%3E%3Cpath d='M2 3a.5.5 0 0 1 .5-.5h11a.5.5 0 0 1 .5.5v1H2V3z'/%3E%3Cpath d='M2 5h12v8a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5z'/%3E%3C/svg%3E");
-}
-
-.bi-speedometer-nav-menu {
-    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='white' viewBox='0 0 16 16'%3E%3Cpath d='M1 11a1 1 0 0 0 1 1h2a1 1 0 0 0 1-1V7a1 1 0 0 0-1-1H2a1 1 0 0 0-1 1v4zm5 0a1 1 0 0 0 1 1h2a1 1 0 0 0 1-1V3a1 1 0 0 0-1-1H7a1 1 0 0 0-1 1v8zm5 0a1 1 0 0 0 1 1h2a1 1 0 0 0 1-1V9a1 1 0 0 0-1-1h-2a1 1 0 0 0-1 1v2z'/%3E%3C/svg%3E");
-}
-
-.bi-table-nav-menu {
-    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='white' viewBox='0 0 16 16'%3E%3Cpath d='M1 2a1 1 0 0 1 1-1h12a1 1 0 0 1 1 1v12a1 1 0 0 1-1 1H2a1 1 0 0 1-1-1V2zm1 1v2h12V3H2zm12 3H2v2h12V6zm0 3H2v2h12V9zm0 3H2v1h12v-1z'/%3E%3C/svg%3E");
-}
-
-.nav-item {
-    font-size: 0.9rem;
-    padding-bottom: 0.5rem;
-}
-
-    .nav-item:first-of-type {
-        padding-top: 1rem;
-    }
-
-    .nav-item:last-of-type {
-        padding-bottom: 1rem;
-    }
-
-    .nav-item ::deep .nav-link {
-        color: #d7d7d7;
-        background: none;
-        border: none;
-        border-radius: 4px;
-        height: 3rem;
-        display: flex;
-        align-items: center;
-        line-height: 3rem;
-        width: 100%;
-    }
-
-.nav-item ::deep a.active {
-    background-color: rgba(255,255,255,0.37);
-    color: white;
-}
-
-.nav-item ::deep .nav-link:hover {
-    background-color: rgba(255,255,255,0.1);
-    color: white;
+.nav-toggle-btn {
+    display: block;
+    background: none;
+    border: none;
+    font-size: 1.4rem;
+    cursor: pointer;
+    padding: 0.25rem 0.5rem;
+    line-height: 1;
 }

 .nav-scrollable {
    display: none;
 }

-.navbar-toggler:checked ~ .nav-scrollable {
-    display: block;
+    .nav-scrollable.nav-open {
+        display: block;
+    }
+
+.sidebar-tree {
+    width: 100%;
 }

@media (min-width: 641px) {
-    .navbar-toggler {
+    .nav-toggle-btn {
        display: none;
    }

    .nav-scrollable {
-        /* Never collapse the sidebar for wide screens */
        display: block;
-
-        /* Allow sidebar to scroll for tall menus */
        height: calc(100vh - 3.5rem);
        overflow-y: auto;
    }
 }
+
--- a/DbFirst.BlazorWebApp/Components/MassDataGrid.razor
+++ b/DbFirst.BlazorWebApp/Components/MassDataGrid.razor
@@ -1,5 +1,5 @@
@inherits BandGridBase<MassDataReadDto>
-@inject MassDataApiClient Api
+@inject IMassDataApiClient Api

@if (!string.IsNullOrWhiteSpace(errorMessage))
 {
@@ -51,6 +51,7 @@ else

    <div class="grid-section">
        <DxGrid Data="@items"
+                ColumnChooserButtonDisplayMode="GridColumnChooserButtonDisplayMode.Always"
                TItem="MassDataReadDto"
                KeyFieldName="@nameof(MassDataReadDto.Id)"
                SizeMode="@_sizeMode"
@@ -71,9 +72,42 @@ else
                DataItemDeleting="OnDataItemDeleting"
                FocusedRowEnabled="true"
                @bind-FocusedRowKey="focusedRowKey"
+                RowClick="@(args => _focusedVisibleIndex = args.VisibleIndex)"
                @ref="gridRef">
            <ToolbarTemplate>
                <DxToolbar>
+                    <DxToolbarItem Alignment="ToolbarItemAlignment.Left">
+                        <Template Context="_">
+                            <DxButton IconCssClass="bi bi-plus-lg"
+                                      RenderStyle="ButtonRenderStyle.Secondary"
+                                      RenderStyleMode="ButtonRenderStyleMode.Text"
+                                      Click="@(() => gridRef!.StartEditNewRowAsync())" />
+                        </Template>
+                    </DxToolbarItem>
+                    <DxToolbarItem Alignment="ToolbarItemAlignment.Left">
+                        <Template Context="_">
+                            <DxButton IconCssClass="bi bi-pencil"
+                                      RenderStyle="ButtonRenderStyle.Secondary"
+                                      RenderStyleMode="ButtonRenderStyleMode.Text"
+                                      Click="EditFocusedRow" />
+                        </Template>
+                    </DxToolbarItem>
+                    <DxToolbarItem Alignment="ToolbarItemAlignment.Left">
+                        <Template Context="_">
+                            <DxButton IconCssClass="bi bi-trash"
+                                      RenderStyle="ButtonRenderStyle.Secondary"
+                                      RenderStyleMode="ButtonRenderStyleMode.Text"
+                                      Click="DeleteFocusedRow" />
+                        </Template>
+                    </DxToolbarItem>
+                    <DxToolbarItem Alignment="ToolbarItemAlignment.Right">
+                        <Template Context="_">
+                            <DxButton Text="Spalten"
+                                      RenderStyle="ButtonRenderStyle.Secondary"
+                                      RenderStyleMode="ButtonRenderStyleMode.Text"
+                                      Click="@(() => gridRef!.ShowColumnChooser())" />
+                        </Template>
+                    </DxToolbarItem>
                    <DxToolbarItem Alignment="ToolbarItemAlignment.Right">
                        <Template Context="_">
                            <DxDropDownButton Text="@FormatSizeText(_sizeMode)"
@@ -141,19 +175,13 @@ else

@code {
    private List<MassDataReadDto> items = new();
-    private bool isLoading;
-    private bool hasLoaded;
-    private string? errorMessage;
-    private string? infoMessage;
    private int pageIndex;
    private int pageCount = 1;
    private int? pageSize = 100;
-    private string popupHeaderText = "Edit";
-    private EditContext? editContext;
-    private ValidationMessageStore? validationMessageStore;
    private int? focusedRowKey;

    protected override string LayoutKey => "MassDataGrid";
+    protected override bool ShowCommandColumn => false;

    protected override List<ColumnDefinition> ColumnDefinitions { get; } = new()
 {
@@ -224,17 +252,7 @@ else
        await LoadPage(0);
    }

-    private void SetEditContext(EditContext context)
-    {
-        if (editContext == context) return;
-        if (editContext != null)
-            editContext.OnFieldChanged -= OnEditFieldChanged;
-        editContext = context;
-        validationMessageStore = new ValidationMessageStore(editContext);
-        editContext.OnFieldChanged += OnEditFieldChanged;
-    }
-
-    private void OnEditFieldChanged(object? sender, FieldChangedEventArgs e)
+    protected override void OnEditFieldChanged(object? sender, FieldChangedEventArgs e)
    {
        if (validationMessageStore == null || editContext == null) return;
        if (e.FieldIdentifier.FieldName == nameof(MassDataEditModel.UpdateProcedure))
@@ -250,9 +268,7 @@ else
        }
    }

-    private void SetPopupHeaderText(bool isNew) => popupHeaderText = isNew ? "Neu" : "Edit";
-
-    private async Task OnCustomizeEditModel(GridCustomizeEditModelEventArgs e)
+    private void OnCustomizeEditModel(GridCustomizeEditModelEventArgs e)
    {
        if (e.IsNew)
        {
@@ -356,25 +372,4 @@ else
        public int? Value { get; set; }
        public string Text { get; set; } = string.Empty;
    }
-
-    private async Task SaveLayoutWithFeedbackAsync()
-    {
-        try
-        {
-            await SaveLayoutAsync();
-            infoMessage = "Layout gespeichert.";
-            errorMessage = null;
-        }
-        catch (Exception ex)
-        {
-            errorMessage = $"Layout konnte nicht gespeichert werden: {ex.Message}";
-        }
-    }
-
-    private async Task ResetLayoutWithFeedbackAsync()
-    {
-        await ResetLayoutAsync();
-        infoMessage = "Layout zurückgesetzt.";
-        errorMessage = null;
-    }
 }
--- a/DbFirst.BlazorWebApp/Components/Pages/Dashboard.razor
+++ b/DbFirst.BlazorWebApp/Components/Pages/Dashboard.razor
@@ -1,9 +1,9 @@
@page "/dashboard"
@page "/dashboards/{DashboardId?}"
@implements IAsyncDisposable
-@inject Microsoft.Extensions.Configuration.IConfiguration Configuration
+@inject IOptions<AppSettings> AppSettingsOptions
@inject NavigationManager Navigation
-@inject DashboardApiClient DashboardApi
+@inject IDashboardApiClient DashboardApi

 <PageTitle>Dashboards</PageTitle>

@@ -45,12 +45,17 @@
    private string SelectedDashboardId { get; set; } = string.Empty;
    private string DashboardKey => $"{SelectedDashboardId}-{(IsDesigner ? "designer" : "viewer")}";

-    private string DashboardEndpoint => $"{Configuration["ApiBaseUrl"]?.TrimEnd('/')}/api/dashboard";
-    private string HubEndpoint => $"{Configuration["ApiBaseUrl"]?.TrimEnd('/')}/hubs/dashboards";
+    private string DashboardEndpoint => $"{AppSettingsOptions.Value.ApiBaseUrl.TrimEnd('/')}/api/dashboard";
+    private string HubEndpoint => $"{AppSettingsOptions.Value.ApiBaseUrl.TrimEnd('/')}/hubs/dashboards";

    protected override async Task OnInitializedAsync()
    {
        await RefreshDashboards();
+    }
+
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (!firstRender) return;

        _hubConnection = new HubConnectionBuilder()
            .WithUrl(HubEndpoint)
--- a/DbFirst.BlazorWebApp/Components/Routes.razor
+++ b/DbFirst.BlazorWebApp/Components/Routes.razor
@@ -1,4 +1,5 @@
-@rendermode InteractiveServer
+@rendermode @(new InteractiveServerRenderMode(prerender: false))
+

 <Router AppAssembly="typeof(Program).Assembly">
    <Found Context="routeData">
--- a/DbFirst.BlazorWebApp/Components/_Imports.razor
+++ b/DbFirst.BlazorWebApp/Components/_Imports.razor
@@ -1,19 +1,27 @@
@using System.Net.Http
@using System.Net.Http.Json
@using System.Text.Json
+
@using Microsoft.AspNetCore.Components.Forms
@using Microsoft.AspNetCore.Components.Rendering
@using Microsoft.AspNetCore.Components.Routing
@using Microsoft.AspNetCore.Components.Web
-@using static Microsoft.AspNetCore.Components.Web.RenderMode
@using Microsoft.AspNetCore.Components.Web.Virtualization
-@using Microsoft.JSInterop
@using Microsoft.AspNetCore.SignalR.Client
+@using Microsoft.JSInterop
+@using Microsoft.Extensions.Options
+@using static Microsoft.AspNetCore.Components.Web.RenderMode
+
@using DbFirst.BlazorWebApp
@using DbFirst.BlazorWebApp.Components
-@using DbFirst.BlazorWebApp.Models
@using DbFirst.BlazorWebApp.Models.Grid
@using DbFirst.BlazorWebApp.Services
+@using DbFirst.Contracts.Catalogs
+@using DbFirst.Contracts.Dashboards
+@using DbFirst.Contracts.MassData
+@using DbFirst.Contracts.Layouts
+@using DbFirst.Domain
+
@using DevExpress.Blazor
@using DevExpress.DashboardBlazor
@using DevExpress.DashboardWeb
--- a/DbFirst.BlazorWebApp/DbFirst.BlazorWebApp.csproj
+++ b/DbFirst.BlazorWebApp/DbFirst.BlazorWebApp.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
@@ -18,4 +18,8 @@
    <Folder Include="wwwroot\images\" />
  </ItemGroup>

+  <ItemGroup>
+    <ProjectReference Include="..\DbFirst.Contracts\DbFirst.Contracts.csproj" />
+  </ItemGroup>
+
 </Project>
--- a/DbFirst.BlazorWebApp/Models/ApiResult.cs
+++ b/DbFirst.BlazorWebApp/Models/ApiResult.cs
@@ -0,0 +1,7 @@
+namespace DbFirst.BlazorWebApp.Models;
+
+public record ApiResult<T>(bool Success, T? Value, string? Error)
+{
+    public static ApiResult<T> Ok(T? value) => new(true, value, null);
+    public static ApiResult<T> Fail(string? error) => new(false, default, error);
+}
--- a/DbFirst.BlazorWebApp/Models/CatalogReadDto.cs
+++ b/DbFirst.BlazorWebApp/Models/CatalogReadDto.cs
@@ -1,12 +0,0 @@
-namespace DbFirst.BlazorWebApp.Models;
-
-public class CatalogReadDto
-{
-    public int Guid { get; set; }
-    public string CatTitle { get; set; } = null!;
-    public string CatString { get; set; } = null!;
-    public string AddedWho { get; set; } = null!;
-    public DateTime AddedWhen { get; set; }
-    public string? ChangedWho { get; set; }
-    public DateTime? ChangedWhen { get; set; }
-}
--- a/DbFirst.BlazorWebApp/Models/CatalogWriteDto.cs
+++ b/DbFirst.BlazorWebApp/Models/CatalogWriteDto.cs
@@ -1,8 +0,0 @@
-namespace DbFirst.BlazorWebApp.Models;
-
-public class CatalogWriteDto
-{
-    public string CatTitle { get; set; } = string.Empty;
-    public string CatString { get; set; } = string.Empty;
-    public int UpdateProcedure { get; set; }
-}
--- a/DbFirst.BlazorWebApp/Models/Grid/BandLayoutModels.cs
+++ b/DbFirst.BlazorWebApp/Models/Grid/BandLayoutModels.cs
@@ -4,8 +4,8 @@ namespace DbFirst.BlazorWebApp.Models.Grid
 {
    public class BandLayout
    {
-        public List<BandDefinition> Bands { get; set; } = new();
-        public List<string> ColumnOrder { get; set; } = new();
+        public List<BandDefinition> Bands { get; set; } = [];
+        public List<string> ColumnOrder { get; set; } = [];
        public Dictionary<string, string?> ColumnWidths { get; set; } = new(StringComparer.OrdinalIgnoreCase);
        public GridPersistentLayout? GridLayout { get; set; }
        public SizeMode SizeMode { get; set; } = SizeMode.Medium;
@@ -15,7 +15,7 @@ namespace DbFirst.BlazorWebApp.Models.Grid
    {
        public string Id { get; set; } = string.Empty;
        public string Caption { get; set; } = string.Empty;
-        public List<string> Columns { get; set; } = new();
+        public List<string> Columns { get; set; } = [];
    }

    public class BandOption
--- a/DbFirst.BlazorWebApp/Program.cs
+++ b/DbFirst.BlazorWebApp/Program.cs
@@ -1,3 +1,4 @@
+using DbFirst.BlazorWebApp;
 using DbFirst.BlazorWebApp.Components;
 using DbFirst.BlazorWebApp.Services;
 using DevExpress.Blazor;
@@ -13,33 +14,18 @@ builder.Services.AddScoped<ThemeState>();
 builder.Services.AddScoped<BandLayoutService>();

 var apiBaseUrl = builder.Configuration["ApiBaseUrl"];
-if (!string.IsNullOrWhiteSpace(apiBaseUrl))
+builder.Services.Configure<AppSettings>(builder.Configuration);
+void ConfigureClient(HttpClient client)
 {
-    builder.Services.AddHttpClient<CatalogApiClient>(client =>
-    {
+    if (!string.IsNullOrWhiteSpace(apiBaseUrl))
        client.BaseAddress = new Uri(apiBaseUrl);
-    });
-    builder.Services.AddHttpClient<DashboardApiClient>(client =>
-    {
-        client.BaseAddress = new Uri(apiBaseUrl);
-    });
-    builder.Services.AddHttpClient<MassDataApiClient>(client =>
-    {
-        client.BaseAddress = new Uri(apiBaseUrl);
-    });
-    builder.Services.AddHttpClient<LayoutApiClient>(client =>
-    {
-        client.BaseAddress = new Uri(apiBaseUrl);
-    });
-}
-else
-{
-    builder.Services.AddHttpClient<CatalogApiClient>();
-    builder.Services.AddHttpClient<DashboardApiClient>();
-    builder.Services.AddHttpClient<MassDataApiClient>();
-    builder.Services.AddHttpClient<LayoutApiClient>();
 }

+builder.Services.AddHttpClient<ICatalogApiClient, CatalogApiClient>(ConfigureClient);
+builder.Services.AddHttpClient<IDashboardApiClient, DashboardApiClient>(ConfigureClient);
+builder.Services.AddHttpClient<IMassDataApiClient, MassDataApiClient>(ConfigureClient);
+builder.Services.AddHttpClient<ILayoutApiClient, LayoutApiClient>(ConfigureClient);
+
 var app = builder.Build();

 // Configure the HTTP request pipeline.
--- a/DbFirst.BlazorWebApp/Services/ApiClientHelper.cs
+++ b/DbFirst.BlazorWebApp/Services/ApiClientHelper.cs
@@ -1,5 +1,4 @@
 using System.Net;
-using System.Net.Http.Json;

 namespace DbFirst.BlazorWebApp.Services;

--- a/DbFirst.BlazorWebApp/Services/BandLayoutService.cs
+++ b/DbFirst.BlazorWebApp/Services/BandLayoutService.cs
@@ -1,24 +1,30 @@
-using DbFirst.BlazorWebApp.Models;
-using DbFirst.BlazorWebApp.Models.Grid;
+using DbFirst.BlazorWebApp.Models.Grid;
+using DbFirst.Contracts.Layouts;
 using Microsoft.JSInterop;
 using System.Text.Json;

 namespace DbFirst.BlazorWebApp.Services
 {
-    public class BandLayoutService(LayoutApiClient layoutApi, IJSRuntime jsRuntime)
+    public class BandLayoutService(ILayoutApiClient layoutApi, IJSRuntime jsRuntime)
    {
        private const string LayoutUserStorageKey = "layoutUser";
        private readonly JsonSerializerOptions _jsonOptions = new(JsonSerializerDefaults.Web);
+        private string? _cachedLayoutUser;

        public async Task<string> EnsureLayoutUserAsync()
        {
+            if (!string.IsNullOrWhiteSpace(_cachedLayoutUser))
+                return _cachedLayoutUser;
+
            var layoutUser = await jsRuntime.InvokeAsync<string?>("localStorage.getItem", LayoutUserStorageKey);
            if (string.IsNullOrWhiteSpace(layoutUser))
            {
                layoutUser = Guid.NewGuid().ToString("N");
                await jsRuntime.InvokeVoidAsync("localStorage.setItem", LayoutUserStorageKey, layoutUser);
            }
-            return layoutUser;
+
+            _cachedLayoutUser = layoutUser;
+            return _cachedLayoutUser;
        }

        public async Task<BandLayout> LoadBandLayoutAsync(
@@ -82,9 +88,9 @@ namespace DbFirst.BlazorWebApp.Services
            Dictionary<string, ColumnDefinition> columnLookup)
        {
            layout ??= new BandLayout();
-            layout.Bands ??= new List<BandDefinition>();
-            layout.ColumnOrder ??= new List<string>();
-            layout.ColumnWidths ??= new Dictionary<string, string?>(StringComparer.OrdinalIgnoreCase);
+            layout.Bands ??= [];
+            layout.ColumnOrder ??= [];
+            layout.ColumnWidths ??= [];

            foreach (var band in layout.Bands)
            {
--- a/DbFirst.BlazorWebApp/Services/CatalogApiClient.cs
+++ b/DbFirst.BlazorWebApp/Services/CatalogApiClient.cs
@@ -1,10 +1,9 @@
-using System.Net;
-using System.Net.Http.Json;
 using DbFirst.BlazorWebApp.Models;
+using DbFirst.Contracts.Catalogs;

 namespace DbFirst.BlazorWebApp.Services;

-public class CatalogApiClient
+public class CatalogApiClient : ICatalogApiClient
 {
    private readonly HttpClient _httpClient;
    private const string Endpoint = "api/catalogs";
@@ -14,20 +13,20 @@ public class CatalogApiClient
        _httpClient = httpClient;
    }

-    public async Task<List<CatalogReadDto>> GetAllAsync()
+    public async Task<List<CatalogReadDto>> GetAllAsync(CancellationToken ct = default)
    {
-        var result = await _httpClient.GetFromJsonAsync<List<CatalogReadDto>>(Endpoint);
-        return result ?? new List<CatalogReadDto>();
+        var result = await _httpClient.GetFromJsonAsync<List<CatalogReadDto>>(Endpoint, ct);
+        return result ?? [];
    }

-    public async Task<CatalogReadDto?> GetByIdAsync(int id)
+    public async Task<CatalogReadDto?> GetByIdAsync(int id, CancellationToken ct = default)
    {
-        return await _httpClient.GetFromJsonAsync<CatalogReadDto>($"{Endpoint}/{id}");
+        return await _httpClient.GetFromJsonAsync<CatalogReadDto>($"{Endpoint}/{id}", ct);
    }

-    public async Task<ApiResult<CatalogReadDto?>> CreateAsync(CatalogWriteDto dto)
+    public async Task<ApiResult<CatalogReadDto?>> CreateAsync(CatalogWriteDto dto, CancellationToken ct = default)
    {
-        var response = await _httpClient.PostAsJsonAsync(Endpoint, dto);
+        var response = await _httpClient.PostAsJsonAsync(Endpoint, dto, ct);
        if (response.IsSuccessStatusCode)
        {
            var payload = await response.Content.ReadFromJsonAsync<CatalogReadDto>();
@@ -38,9 +37,9 @@ public class CatalogApiClient
        return ApiResult<CatalogReadDto?>.Fail(error);
    }

-    public async Task<ApiResult<bool>> UpdateAsync(int id, CatalogWriteDto dto)
+    public async Task<ApiResult<bool>> UpdateAsync(int id, CatalogWriteDto dto, CancellationToken ct = default)
    {
-        var response = await _httpClient.PutAsJsonAsync($"{Endpoint}/{id}", dto);
+        var response = await _httpClient.PutAsJsonAsync($"{Endpoint}/{id}", dto, ct);
        if (response.IsSuccessStatusCode)
        {
            return ApiResult<bool>.Ok(true);
@@ -50,9 +49,9 @@ public class CatalogApiClient
        return ApiResult<bool>.Fail(error);
    }

-    public async Task<ApiResult<bool>> DeleteAsync(int id)
+    public async Task<ApiResult<bool>> DeleteAsync(int id, CancellationToken ct = default)
    {
-        var response = await _httpClient.DeleteAsync($"{Endpoint}/{id}");
+        var response = await _httpClient.DeleteAsync($"{Endpoint}/{id}", ct);
        if (response.IsSuccessStatusCode)
        {
            return ApiResult<bool>.Ok(true);
@@ -61,11 +60,4 @@ public class CatalogApiClient
        var error = await ApiClientHelper.ReadErrorAsync(response);
        return ApiResult<bool>.Fail(error);
    }
-}
-
-public record ApiResult<T>(bool Success, T? Value, string? Error)
-{
-    public static ApiResult<T> Ok(T? value) => new(true, value, null);
-    public static ApiResult<T> Fail(string? error) => new(false, default, error);
-}
-
+}
--- a/DbFirst.BlazorWebApp/Services/DashboardApiClient.cs
+++ b/DbFirst.BlazorWebApp/Services/DashboardApiClient.cs
@@ -1,9 +1,8 @@
-using System.Net.Http.Json;
-using DbFirst.BlazorWebApp.Models;
+using DbFirst.Contracts.Dashboards;

 namespace DbFirst.BlazorWebApp.Services;

-public class DashboardApiClient
+public class DashboardApiClient : IDashboardApiClient
 {
    private readonly HttpClient _httpClient;
    private const string Endpoint = "api/dashboard/dashboards";
@@ -13,9 +12,9 @@ public class DashboardApiClient
        _httpClient = httpClient;
    }

-    public async Task<List<DashboardInfoDto>> GetAllAsync()
+    public async Task<List<DashboardInfoDto>> GetAllAsync(CancellationToken ct = default)
    {
-        var result = await _httpClient.GetFromJsonAsync<List<DashboardInfoDto>>(Endpoint);
-        return result ?? new List<DashboardInfoDto>();
+        var result = await _httpClient.GetFromJsonAsync<List<DashboardInfoDto>>(Endpoint, ct);
+        return result ?? [];
    }
 }
--- a/DbFirst.BlazorWebApp/Services/ICatalogApiClient.cs
+++ b/DbFirst.BlazorWebApp/Services/ICatalogApiClient.cs
@@ -0,0 +1,13 @@
+using DbFirst.BlazorWebApp.Models;
+using DbFirst.Contracts.Catalogs;
+
+namespace DbFirst.BlazorWebApp.Services;
+
+public interface ICatalogApiClient
+{
+    Task<List<CatalogReadDto>> GetAllAsync(CancellationToken ct = default);
+    Task<CatalogReadDto?> GetByIdAsync(int id, CancellationToken ct = default);
+    Task<ApiResult<CatalogReadDto?>> CreateAsync(CatalogWriteDto dto, CancellationToken ct = default);
+    Task<ApiResult<bool>> UpdateAsync(int id, CatalogWriteDto dto, CancellationToken ct = default);
+    Task<ApiResult<bool>> DeleteAsync(int id, CancellationToken ct = default);
+}
--- a/DbFirst.BlazorWebApp/Services/IDashboardApiClient.cs
+++ b/DbFirst.BlazorWebApp/Services/IDashboardApiClient.cs
@@ -0,0 +1,9 @@
+using DbFirst.Contracts.Dashboards;
+
+namespace DbFirst.BlazorWebApp.Services
+{
+    public interface IDashboardApiClient
+    {
+        Task<List<DashboardInfoDto>> GetAllAsync(CancellationToken ct = default);
+    }
+}
--- a/DbFirst.BlazorWebApp/Services/ILayoutApiClient.cs
+++ b/DbFirst.BlazorWebApp/Services/ILayoutApiClient.cs
@@ -0,0 +1,11 @@
+using DbFirst.Contracts.Layouts;
+
+namespace DbFirst.BlazorWebApp.Services
+{
+    public interface ILayoutApiClient
+    {
+        Task<LayoutDto?> GetAsync(string layoutType, string layoutKey, string userName, CancellationToken ct = default);
+        Task<LayoutDto> UpsertAsync(LayoutDto dto, CancellationToken ct = default);
+        Task DeleteAsync(string layoutType, string layoutKey, string userName, CancellationToken ct = default);
+    }
+}
--- a/DbFirst.BlazorWebApp/Services/IMassDataApiClient.cs
+++ b/DbFirst.BlazorWebApp/Services/IMassDataApiClient.cs
@@ -0,0 +1,13 @@
+using DbFirst.BlazorWebApp.Models;
+using DbFirst.Contracts.MassData;
+
+namespace DbFirst.BlazorWebApp.Services
+{
+    public interface IMassDataApiClient
+    {
+        Task<int> GetCountAsync(CancellationToken ct = default);
+        Task<List<MassDataReadDto>> GetAllAsync(int? skip, int? take, CancellationToken ct = default);
+        Task<ApiResult<MassDataReadDto?>> UpsertAsync(MassDataWriteDto dto, CancellationToken ct = default);
+        Task<MassDataReadDto?> GetByCustomerNameAsync(string customerName, CancellationToken ct = default);
+    }
+}
--- a/DbFirst.BlazorWebApp/Services/LayoutApiClient.cs
+++ b/DbFirst.BlazorWebApp/Services/LayoutApiClient.cs
@@ -1,9 +1,8 @@
-using System.Net.Http.Json;
-using DbFirst.BlazorWebApp.Models;
+using DbFirst.Contracts.Layouts;

 namespace DbFirst.BlazorWebApp.Services;

-public class LayoutApiClient
+public class LayoutApiClient : ILayoutApiClient
 {
    private readonly HttpClient _httpClient;
    private const string Endpoint = "api/layouts";
@@ -13,10 +12,10 @@ public class LayoutApiClient
        _httpClient = httpClient;
    }

-    public async Task<LayoutDto?> GetAsync(string layoutType, string layoutKey, string userName)
+    public async Task<LayoutDto?> GetAsync(string layoutType, string layoutKey, string userName, CancellationToken ct = default)
    {
        var url = $"{Endpoint}?layoutType={Uri.EscapeDataString(layoutType)}&layoutKey={Uri.EscapeDataString(layoutKey)}&userName={Uri.EscapeDataString(userName)}";
-        var response = await _httpClient.GetAsync(url);
+        var response = await _httpClient.GetAsync(url, ct);
        if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
        {
            return null;
@@ -26,12 +25,12 @@ public class LayoutApiClient
        return await response.Content.ReadFromJsonAsync<LayoutDto>();
    }

-    public async Task<LayoutDto> UpsertAsync(LayoutDto dto)
+    public async Task<LayoutDto> UpsertAsync(LayoutDto dto, CancellationToken ct = default)
    {
-        var response = await _httpClient.PostAsJsonAsync(Endpoint, dto);
+        var response = await _httpClient.PostAsJsonAsync(Endpoint, dto, ct);
        if (!response.IsSuccessStatusCode)
        {
-            var detail = await ReadErrorAsync(response);
+            var detail = await ApiClientHelper.ReadErrorAsync(response);
            throw new InvalidOperationException(detail);
        }

@@ -39,21 +38,10 @@ public class LayoutApiClient
        return payload ?? dto;
    }

-    private static async Task<string> ReadErrorAsync(HttpResponseMessage response)
-    {
-        var body = await response.Content.ReadAsStringAsync();
-        if (!string.IsNullOrWhiteSpace(body))
-        {
-            return body;
-        }
-
-        return $"{(int)response.StatusCode} {response.ReasonPhrase}".Trim();
-    }
-
-    public async Task DeleteAsync(string layoutType, string layoutKey, string userName)
+    public async Task DeleteAsync(string layoutType, string layoutKey, string userName, CancellationToken ct = default)
    {
        var url = $"{Endpoint}?layoutType={Uri.EscapeDataString(layoutType)}&layoutKey={Uri.EscapeDataString(layoutKey)}&userName={Uri.EscapeDataString(userName)}";
-        var response = await _httpClient.DeleteAsync(url);
+        var response = await _httpClient.DeleteAsync(url, ct);
        if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
        {
            return;
--- a/DbFirst.BlazorWebApp/Services/MassDataApiClient.cs
+++ b/DbFirst.BlazorWebApp/Services/MassDataApiClient.cs
@@ -1,9 +1,9 @@
-using System.Net.Http.Json;
 using DbFirst.BlazorWebApp.Models;
+using DbFirst.Contracts.MassData;

 namespace DbFirst.BlazorWebApp.Services;

-public class MassDataApiClient
+public class MassDataApiClient : IMassDataApiClient
 {
    private readonly HttpClient _httpClient;
    private const string Endpoint = "api/massdata";
@@ -13,13 +13,13 @@ public class MassDataApiClient
        _httpClient = httpClient;
    }

-    public async Task<int> GetCountAsync()
+    public async Task<int> GetCountAsync(CancellationToken ct = default)
    {
-        var result = await _httpClient.GetFromJsonAsync<int?>("api/massdata/count");
+        var result = await _httpClient.GetFromJsonAsync<int?>("api/massdata/count", ct);
        return result ?? 0;
    }

-    public async Task<List<MassDataReadDto>> GetAllAsync(int? skip, int? take)
+    public async Task<List<MassDataReadDto>> GetAllAsync(int? skip, int? take, CancellationToken ct = default)
    {
        var query = new List<string>();
        if (skip.HasValue)
@@ -32,13 +32,13 @@ public class MassDataApiClient
        }

        var url = query.Count == 0 ? Endpoint : $"{Endpoint}?{string.Join("&", query)}";
-        var result = await _httpClient.GetFromJsonAsync<List<MassDataReadDto>>(url);
-        return result ?? new List<MassDataReadDto>();
+        var result = await _httpClient.GetFromJsonAsync<List<MassDataReadDto>>(url, ct);
+        return result ?? [];
    }

-    public async Task<ApiResult<MassDataReadDto?>> UpsertAsync(MassDataWriteDto dto)
+    public async Task<ApiResult<MassDataReadDto?>> UpsertAsync(MassDataWriteDto dto, CancellationToken ct = default)
    {
-        var response = await _httpClient.PostAsJsonAsync($"{Endpoint}/upsert", dto);
+        var response = await _httpClient.PostAsJsonAsync($"{Endpoint}/upsert", dto, ct);
        if (response.IsSuccessStatusCode)
        {
            var payload = await response.Content.ReadFromJsonAsync<MassDataReadDto>();
@@ -49,14 +49,14 @@ public class MassDataApiClient
        return ApiResult<MassDataReadDto?>.Fail(error);
    }

-    public async Task<MassDataReadDto?> GetByCustomerNameAsync(string customerName)
+    public async Task<MassDataReadDto?> GetByCustomerNameAsync(string customerName, CancellationToken ct = default)
    {
        if (string.IsNullOrWhiteSpace(customerName))
        {
            return null;
        }

-        var response = await _httpClient.GetAsync($"{Endpoint}/{Uri.EscapeDataString(customerName)}");
+        var response = await _httpClient.GetAsync($"{Endpoint}/{Uri.EscapeDataString(customerName)}", ct);
        if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
        {
            return null;
--- a/DbFirst.BlazorWebApp/Services/ThemeState.cs
+++ b/DbFirst.BlazorWebApp/Services/ThemeState.cs
@@ -12,24 +12,54 @@ public class ThemeState
    }

    public bool IsDarkMode { get; private set; }
+    public string CurrentThemeName { get; private set; } = "Fluent";
+
+    /// <summary>
+    /// Themes die eine native DevExpress Dark-Variante besitzen:
+    ///   - Fluent  ? Themes.Fluent.Clone(ThemeMode.Dark), verwendet --DS-* Token-System
+    ///   - BlazingBerry ? Themes.BlazingDark
+    /// Alle anderen Themes (Purple, OfficeWhite, BootstrapExternal) haben keine offizielle
+    /// Dark-Variante; dort übernehmen CSS-Overrides auf --dxbl-grid-* Variablen die Arbeit.
+    /// </summary>
+    public bool IsNativeDarkTheme => IsDarkMode &&
+        (CurrentThemeName == "Fluent" || CurrentThemeName == "BlazingBerry");
+
+    public static readonly List<string> AvailableThemes = ["Fluent", "BlazingBerry", "Purple", "OfficeWhite", "BootstrapExternal"];

    public event Action? OnChange;

-    public void SetDarkMode(bool isDarkMode)
+    public void SetTheme(string themeName)
    {
-        if (IsDarkMode == isDarkMode)
-        {
-            return;
-        }
-
-        IsDarkMode = isDarkMode;
-        var theme = Themes.Fluent.Clone(properties =>
-        {
-            properties.Mode = isDarkMode ? ThemeMode.Dark : ThemeMode.Light;
-            properties.ApplyToPageElements = true;
-        });
-
-        themeChangeService.SetTheme(theme);
+        if (CurrentThemeName == themeName) return;
+        CurrentThemeName = themeName;
+        ApplyTheme();
        OnChange?.Invoke();
    }
-}
+
+    public void SetDarkMode(bool isDarkMode)
+    {
+        if (IsDarkMode == isDarkMode) return;
+        IsDarkMode = isDarkMode;
+        ApplyTheme();
+        OnChange?.Invoke();
+    }
+
+    private void ApplyTheme()
+    {
+        if (CurrentThemeName == "Fluent")
+        {
+            var theme = Themes.Fluent.Clone(properties =>
+            {
+                properties.Mode = IsDarkMode ? ThemeMode.Dark : ThemeMode.Light;
+                properties.ApplyToPageElements = true;
+            });
+            themeChangeService.SetTheme(theme);
+        }
+        else if (CurrentThemeName == "BlazingBerry") themeChangeService.SetTheme(IsDarkMode ? Themes.BlazingDark : Themes.BlazingBerry);
+        else if (CurrentThemeName == "Purple")           themeChangeService.SetTheme(Themes.Purple);
+        else if (CurrentThemeName == "OfficeWhite")      themeChangeService.SetTheme(Themes.OfficeWhite);
+        else if (CurrentThemeName == "BootstrapExternal") themeChangeService.SetTheme(Themes.BootstrapExternal);
+        else
+            themeChangeService.SetTheme(Themes.Fluent);
+    }
+}
--- a/DbFirst.BlazorWebApp/appsettings.Development.json
+++ b/DbFirst.BlazorWebApp/appsettings.Development.json
@@ -5,5 +5,11 @@
      "Microsoft.AspNetCore": "Warning"
    }
  },
-  "ApiBaseUrl": "https://localhost:7204/"
+  "ApiBaseUrl": "https://localhost:7204/",
+  "BrowserLink": {
+    "Enabled": false
+  },
+  "DetailedErrors": true
 }
+
+
--- a/DbFirst.BlazorWebApp/wwwroot/app.css
+++ b/DbFirst.BlazorWebApp/wwwroot/app.css
@@ -148,6 +148,105 @@ dxbl-grid tbody tr:nth-child(even) td {
    background-color: var(--grid-stripe-bg) !important;
 }

+/* ?? Dark-Mode-Overrides für nicht-native Themes ?????????????????????????????
+   Strategie: CSS-Custom-Properties werden von DevExpress DIREKT auf den
+   Komponenten-Elementen definiert (z. B. --dxbl-popup-bg:#fff auf .dxbl-modal).
+   Eine geerbte Variable aus html.dx-dark würde durch die direkte Zuweisung
+   überschrieben. Deshalb targeten wir exakt dieselben Elemente, aber mit einem
+   zusätzlichen Vorfahren-Selektor (html.dx-dark) für höhere Spezifizität:
+     html.dx-dark .dxbl-modal = (0,2,1)  >  .dxbl-modal = (0,1,0)  ?
+   html.dx-dark wird per JS gesetzt, wenn IsDarkMode && !IsNativeDarkTheme.
+?? */
+
+/* Popup / Modal (CRUD-Dialoge) – Variablen-Quelle: .dxbl-modal */
+html.dx-dark .dxbl-modal {
+    --dxbl-popup-bg: #2d2d2d;
+    --dxbl-popup-color: #e8e8e8;
+    --dxbl-popup-border-color: #555;
+    --dxbl-popup-header-bg: #333;
+    --dxbl-popup-header-color: #e8e8e8;
+    --dxbl-popup-footer-bg: #333;
+    --dxbl-popup-footer-color: #e8e8e8;
+}
+
+/* Flyout (Column Chooser, Filter-Panel) – Variablen-Quelle: .dxbl-flyout */
+html.dx-dark .dxbl-flyout {
+    --dxbl-flyout-bg: #2d2d2d;
+    --dxbl-flyout-color: #e8e8e8;
+    --dxbl-flyout-border-color: #555;
+    --dxbl-flyout-header-bg: #333;
+    --dxbl-flyout-header-color: #e8e8e8;
+    --dxbl-flyout-footer-bg: #333;
+}
+
+/* Dropdown (ComboBox-Klappliste, Band-Dropdowns) – Quelle: .dxbl-dropdown */
+html.dx-dark .dxbl-dropdown,
+html.dx-dark .dxbl-itemlist-dropdown {
+    --dxbl-dropdown-bg: #2d2d2d;
+    --dxbl-dropdown-color: #e8e8e8;
+    --dxbl-dropdown-border-color: #555;
+    --dxbl-dropdown-header-bg: #333;
+    --dxbl-dropdown-footer-bg: #333;
+}
+
+/* Edit-Dropdown (ComboBox-Popup wenn als Modal gerendert) – Quelle: .dxbl-edit-dropdown */
+html.dx-dark .dxbl-edit-dropdown {
+    --dxbl-edit-dropdown-bg: #2d2d2d;
+    --dxbl-edit-dropdown-color: #e8e8e8;
+    --dxbl-edit-dropdown-border-color: #555;
+}
+
+/* ListBox (Einträge in Dropdowns) – Quelle: .dxbl-list-box */
+html.dx-dark .dxbl-list-box,
+html.dx-dark .dxbl-list-box-render-container {
+    --dxbl-list-box-bg: #2d2d2d;
+    --dxbl-list-box-color: #e8e8e8;
+    --dxbl-list-box-border-color: #555;
+    --dxbl-list-box-item-hover-bg: #3a3a3a;
+    --dxbl-list-box-item-hover-color: #e8e8e8;
+}
+
+/* TextEdit / ComboBox – Eingabefeld – Quelle: .dxbl-text-edit */
+html.dx-dark .dxbl-text-edit {
+    --dxbl-text-edit-bg: #2d2d2d;
+    --dxbl-text-edit-color: #e8e8e8;
+    --dxbl-text-edit-border-color: #555;
+    --dxbl-text-edit-btn-bg: #3a3a3a;
+    --dxbl-text-edit-btn-color: #e8e8e8;
+    --dxbl-text-edit-btn-hover-bg: #444;
+    --dxbl-text-edit-btn-hover-color: #e8e8e8;
+}
+
+/* Buttons */
+html.dx-dark .dxbl-btn {
+    --dxbl-btn-color: #e8e8e8;
+    --dxbl-btn-bg: #3a3a3a;
+    --dxbl-btn-border-color: #555;
+    --dxbl-btn-hover-bg: #444;
+    --dxbl-btn-hover-color: #e8e8e8;
+    --dxbl-btn-hover-border-color: #666;
+}
+
+/* FormLayout */
+html.dx-dark .dxbl-fl {
+    --dxbl-fl-caption-color: #bbb;
+    --dxbl-fl-group-bg: #242424;
+    --dxbl-fl-group-color: #e8e8e8;
+}
+
+/* Grid */
+html.dx-dark .dxbl-grid {
+    background-color: #242424;
+    color: #e8e8e8;
+    border-color: #444;
+}
+
+html.dx-dark .dxbl-grid > .dxbl-scroll-viewer,
+html.dx-dark .dxbl-grid > .dxbl-grid-top-panel {
+    background-color: #242424;
+    color: #e8e8e8;
+}
+
 /* MassData-spezifisch */
 .page-size-selector {
    display: flex;
@@ -185,3 +284,7 @@ dxbl-grid tbody tr:nth-child(even) td {
    align-items: center;
    justify-content: center;
 }
+
+.top-row .btn-gap {
+    margin-left: 8px;
+}
--- a/DbFirst.BlazorWebApp/wwwroot/js/size-manager.js
+++ b/DbFirst.BlazorWebApp/wwwroot/js/size-manager.js
@@ -1,3 +1,4 @@
 window.setSize = function (fontSize) {
    document.documentElement.style.setProperty('--global-size', fontSize);
 };
+
--- a/DbFirst.Contracts/Catalogs/CatalogReadDto.cs
+++ b/DbFirst.Contracts/Catalogs/CatalogReadDto.cs
@@ -0,0 +1,12 @@
+namespace DbFirst.Contracts.Catalogs;
+
+public class CatalogReadDto
+{
+    public int Guid { get; set; }
+    public string CatTitle { get; set; } = string.Empty;
+    public string CatString { get; set; } = string.Empty;
+    public string AddedWho { get; set; } = string.Empty;
+    public DateTime AddedWhen { get; set; }
+    public string? ChangedWho { get; set; }
+    public DateTime? ChangedWhen { get; set; }
+}
--- a/DbFirst.Contracts/Catalogs/CatalogWriteDto.cs
+++ b/DbFirst.Contracts/Catalogs/CatalogWriteDto.cs
@@ -0,0 +1,10 @@
+using DbFirst.Domain;
+
+namespace DbFirst.Contracts.Catalogs;
+
+public class CatalogWriteDto
+{
+    public string CatTitle { get; set; } = string.Empty;
+    public string CatString { get; set; } = string.Empty;
+    public CatalogUpdateProcedure UpdateProcedure { get; set; } = CatalogUpdateProcedure.Update;
+}
--- a/DbFirst.Contracts/Dashboards/DashboardInfoDto.cs
+++ b/DbFirst.Contracts/Dashboards/DashboardInfoDto.cs
@@ -1,7 +1,7 @@
-namespace DbFirst.BlazorWebApp.Models;
+namespace DbFirst.Contracts.Dashboards;

 public class DashboardInfoDto
 {
    public string Id { get; set; } = string.Empty;
    public string Name { get; set; } = string.Empty;
-}
+}
--- a/DbFirst.Contracts/DbFirst.Contracts.csproj
+++ b/DbFirst.Contracts/DbFirst.Contracts.csproj
@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\DbFirst.Domain\DbFirst.Domain.csproj" />
+  </ItemGroup>
+
+</Project>
--- a/DbFirst.BlazorWebApp/Models/LayoutDto.cs
+++ b/DbFirst.BlazorWebApp/Models/LayoutDto.cs
@@ -1,4 +1,4 @@
-namespace DbFirst.BlazorWebApp.Models;
+namespace DbFirst.Contracts.Layouts;

 public class LayoutDto
 {
@@ -6,4 +6,4 @@ public class LayoutDto
    public string LayoutKey { get; set; } = string.Empty;
    public string UserName { get; set; } = string.Empty;
    public string LayoutData { get; set; } = string.Empty;
-}
+}
--- a/DbFirst.BlazorWebApp/Models/MassDataReadDto.cs
+++ b/DbFirst.BlazorWebApp/Models/MassDataReadDto.cs
@@ -1,4 +1,4 @@
-namespace DbFirst.BlazorWebApp.Models;
+namespace DbFirst.Contracts.MassData;

 public class MassDataReadDto
 {
@@ -9,4 +9,4 @@ public class MassDataReadDto
    public bool StatusFlag { get; set; }
    public DateTime AddedWhen { get; set; }
    public DateTime? ChangedWhen { get; set; }
-}
+}
--- a/DbFirst.BlazorWebApp/Models/MassDataWriteDto.cs
+++ b/DbFirst.BlazorWebApp/Models/MassDataWriteDto.cs
@@ -1,4 +1,4 @@
-namespace DbFirst.BlazorWebApp.Models;
+namespace DbFirst.Contracts.MassData;

 public class MassDataWriteDto
 {
@@ -6,4 +6,4 @@ public class MassDataWriteDto
    public decimal Amount { get; set; }
    public string Category { get; set; } = string.Empty;
    public bool StatusFlag { get; set; }
-}
+}
--- a/DbFirst.Domain/Entities/VwmyCatalog.cs
+++ b/DbFirst.Domain/Entities/VwmyCatalog.cs
@@ -4,12 +4,12 @@ public partial class VwmyCatalog
 {
    public int Guid { get; set; }

-    public string CatTitle { get; set; } = null!;
+    public string CatTitle { get; set; } = string.Empty;

-    public string CatString { get; set; } = null!;
-
-    public string AddedWho { get; set; } = null!;
+    public string CatString { get; set; } = string.Empty;

+    public string AddedWho { get; set; } = string.Empty;
+    
    public DateTime AddedWhen { get; set; }

    public string? ChangedWho { get; set; }
--- a/DbFirst.Infrastructure/DbFirst.Infrastructure.csproj
+++ b/DbFirst.Infrastructure/DbFirst.Infrastructure.csproj
@@ -7,7 +7,7 @@
  </PropertyGroup>

  <ItemGroup>
-    <PackageReference Include="AutoMapper" Version="12.0.1" />
+    <PackageReference Include="AutoMapper" Version="16.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.22" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.22" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="8.0.22">
@@ -15,7 +15,7 @@
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.Data.SqlClient" Version="5.2.1" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.2" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.0" />
    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="8.0.0" />
  </ItemGroup>

--- a/DbFirst.Infrastructure/DependencyInjection.cs
+++ b/DbFirst.Infrastructure/DependencyInjection.cs
@@ -1,3 +1,5 @@
+using DbFirst.Application.Repositories;
+using DbFirst.Infrastructure.Repositories;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
@@ -15,6 +17,10 @@ public static class DependencyInjection
        services.AddDbContext<MassDataDbContext>(options =>
            options.UseSqlServer(configuration.GetConnectionString("MassDataConnection")));

+        services.AddScoped<ICatalogRepository, CatalogRepository>();
+        services.AddScoped<IMassDataRepository, MassDataRepository>();
+        services.AddScoped<ILayoutRepository, LayoutRepository>();
+
        return services;
    }
 }
--- a/DbFirst.Infrastructure/Repositories/CatalogRepository.cs
+++ b/DbFirst.Infrastructure/Repositories/CatalogRepository.cs
@@ -1,6 +1,6 @@
+using DbFirst.Application.Repositories;
 using DbFirst.Domain;
 using DbFirst.Domain.Entities;
-using DbFirst.Application.Repositories;
 using Microsoft.Data.SqlClient;
 using Microsoft.EntityFrameworkCore;
 using System.Data;
--- a/DbFirst.Infrastructure/Repositories/LayoutRepository.cs
+++ b/DbFirst.Infrastructure/Repositories/LayoutRepository.cs
@@ -34,7 +34,7 @@ public class LayoutRepository : ILayoutRepository
                UserName = userName,
                LayoutData = layoutData,
                AddedWho = userName,
-                AddedWhen = DateTime.Now
+                AddedWhen = DateTime.UtcNow
            };
            _db.SmfLayouts.Add(entity);
        }
--- a/DbFirst.Infrastructure/Repositories/MassDataRepository.cs
+++ b/DbFirst.Infrastructure/Repositories/MassDataRepository.cs
@@ -1,8 +1,8 @@
-using System.Data;
 using DbFirst.Application.Repositories;
 using DbFirst.Domain.Entities;
 using Microsoft.Data.SqlClient;
 using Microsoft.EntityFrameworkCore;
+using System.Data;

 namespace DbFirst.Infrastructure.Repositories;

@@ -20,11 +20,6 @@ public class MassDataRepository : IMassDataRepository
        return await _db.Massdata.AsNoTracking().CountAsync(cancellationToken);
    }

-    public async Task<List<Massdata>> GetAllAsync(CancellationToken cancellationToken = default)
-    {
-        return await _db.Massdata.AsNoTracking().ToListAsync(cancellationToken);
-    }
-
    public async Task<Massdata?> GetByCustomerNameAsync(string customerName, CancellationToken cancellationToken = default)
    {
        return await _db.Massdata.AsNoTracking()
--- a/DbFirst.sln
+++ b/DbFirst.sln
@@ -13,6 +13,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DbFirst.Domain", "DbFirst.D
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DbFirst.BlazorWebApp", "DbFirst.BlazorWebApp\DbFirst.BlazorWebApp.csproj", "{FF1D77C4-A13D-43E0-BCE1-C18C01F1767C}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DbFirst.Contracts", "DbFirst.Contracts\DbFirst.Contracts.csproj", "{94FFCA01-9476-49B3-B7D0-5706514E42E4}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -83,6 +85,18 @@ Global
 		{FF1D77C4-A13D-43E0-BCE1-C18C01F1767C}.Release|x64.Build.0 = Release|Any CPU
 		{FF1D77C4-A13D-43E0-BCE1-C18C01F1767C}.Release|x86.ActiveCfg = Release|Any CPU
 		{FF1D77C4-A13D-43E0-BCE1-C18C01F1767C}.Release|x86.Build.0 = Release|Any CPU
+		{94FFCA01-9476-49B3-B7D0-5706514E42E4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{94FFCA01-9476-49B3-B7D0-5706514E42E4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{94FFCA01-9476-49B3-B7D0-5706514E42E4}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{94FFCA01-9476-49B3-B7D0-5706514E42E4}.Debug|x64.Build.0 = Debug|Any CPU
+		{94FFCA01-9476-49B3-B7D0-5706514E42E4}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{94FFCA01-9476-49B3-B7D0-5706514E42E4}.Debug|x86.Build.0 = Debug|Any CPU
+		{94FFCA01-9476-49B3-B7D0-5706514E42E4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{94FFCA01-9476-49B3-B7D0-5706514E42E4}.Release|Any CPU.Build.0 = Release|Any CPU
+		{94FFCA01-9476-49B3-B7D0-5706514E42E4}.Release|x64.ActiveCfg = Release|Any CPU
+		{94FFCA01-9476-49B3-B7D0-5706514E42E4}.Release|x64.Build.0 = Release|Any CPU
+		{94FFCA01-9476-49B3-B7D0-5706514E42E4}.Release|x86.ActiveCfg = Release|Any CPU
+		{94FFCA01-9476-49B3-B7D0-5706514E42E4}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
Author	SHA1	Message	Date
OlgunR	8933deec96	Add dark mode override for non-native DevExpress themes Implements a dark mode override system for DevExpress Blazor themes lacking native dark support. Adds a JS function to toggle a dx-dark class on <html>, updates ThemeState to detect native dark themes, and applies targeted CSS variable overrides for consistent dark styling. Disables prerendering to ensure JS interop, and improves theme switching logic and documentation.	2026-05-05 16:41:15 +02:00
OlgunR	2010673eba	Remove unused menu state and toggle logic from NavMenu Removed the private menuOpen field and ToggleMenu() method from NavMenu.razor, as they are no longer needed for menu state management.	2026-04-30 15:41:05 +02:00
OlgunR	b75e7d730c	Modernize sidebar with DxTreeView and new responsive styles Refactor NavMenu to use DevExpress DxTreeView for navigation, replacing the old NavLink-based menu. Update sidebar and navigation row styling to use CSS variables, remove Bootstrap-specific and SVG icon CSS, and add a responsive hamburger menu for small screens. Improve dark mode support and overall maintainability.	2026-04-30 15:37:04 +02:00
OlgunR	075433c780	Improve spacing for Dark Mode button in top row Wrapped the Dark Mode toggle button in a span with left margin for better separation from the theme combo box. Added a new .btn-gap CSS class to standardize button spacing in the top row.	2026-04-23 15:59:50 +02:00
OlgunR	35e39ff979	Add theme selection dropdown and refactor theme handling Introduce a DxComboBox in MainLayout for selecting between multiple themes. Update ThemeState to manage the current theme, provide a list of available themes, and apply the selected theme via a new SetTheme method. Refactor dark mode handling to work with the new theme system, and ensure UI updates on theme or mode changes.	2026-04-23 15:44:26 +02:00
OlgunR	292ce02370	Refactor using statements for clearer layer boundaries Clean up and reorganize using/import statements across the solution. Remove unnecessary DTO imports from Application and Infrastructure layers, and ensure Contracts DTOs are only referenced in API and BlazorWebApp layers. No business logic is changed; these updates improve code organization, reduce coupling, and clarify architectural separation between layers.	2026-04-23 13:55:05 +02:00
OlgunR	df4de5d5f5	Refactor imports and ensure enum type safety in Catalogs Reorganize and deduplicate using directives in _Imports.razor for clarity and maintainability. Explicitly cast UpdateProcedure to CatalogUpdateProcedure in CatalogsGrid.razor to enforce type safety. Restore necessary DevExpress and DbFirst namespaces.	2026-04-23 13:54:50 +02:00
OlgunR	e4624c92ef	Refactor DTOs: make public, add properties, clean up Refactored DTO classes by removing unnecessary using statements and internal wrappers, making them public, and adding explicit properties with default values. Clarified namespaces and improved accessibility for use in API contracts or service layers. Added CatalogUpdateProcedure to CatalogWriteDto to specify update operation type.	2026-04-23 11:48:45 +02:00
OlgunR	b0d60461b4	Standardize DTO naming and namespaces for MassData Refactored DTO class and namespace names from Massdata* to MassData* in DbFirst.Contracts. Updated all relevant application files to use the correct DTO namespaces for Catalogs and MassData. Adjusted _Imports.razor to include new DTO namespaces and removed unused usings. These changes improve code consistency and reduce namespace-related errors.	2026-04-23 11:41:10 +02:00
OlgunR	c45c1a69a7	Remove obsolete DTO classes and add Layouts folder Deleted DTOs for catalogs, layouts, mass data, and dashboard info from both Application and BlazorWebApp.Models namespaces. Updated DbFirst.Application.csproj to include a new Layouts folder for future organization. No functional code changes in this commit.	2026-04-23 11:25:31 +02:00
OlgunR	b268e53e1f	Add project references to Contracts and Domain projects Added DbFirst.Contracts as a project reference to both DbFirst.Application and DbFirst.BlazorWebApp, and added DbFirst.Domain to DbFirst.Application. Also, a BOM was introduced in the BlazorWebApp project file. These changes enable shared use of contracts and domain types across projects.	2026-04-23 11:23:24 +02:00
OlgunR	a1fee6f5c0	Add initial empty DTO classes for Catalogs, Dashboards, etc. Introduced six new internal DTO classes: CatalogReadDto, CatalogWriteDto, DashboardInfoDto, LayoutDto, MassdataReadDto, and MassdataWriteDto. Each class resides in its appropriate namespace and currently contains no properties or methods, serving as placeholders for future data transfer logic.	2026-04-23 11:22:58 +02:00
OlgunR	dbb39354ab	Add DbFirst.Contracts project to solution Added new DbFirst.Contracts project targeting .NET 8.0 with nullable and implicit usings enabled. Included a project reference to DbFirst.Domain and updated the solution file to register the new project with all build configurations.	2026-04-23 11:15:53 +02:00
OlgunR	2ffa389978	Update AutoMapper to 16.1.1 and adjust registration Upgraded AutoMapper to version 16.1.1 across API, Application, and Infrastructure projects. Removed AutoMapper.Extensions.Microsoft.DependencyInjection where no longer needed. Updated AutoMapper registration in DependencyInjection.cs to use the new API. No other changes made.	2026-04-22 09:35:50 +02:00
OlgunR	f54de87ca2	Standardize string property initialization to string.Empty Replaced String.Empty and null! with string.Empty for string properties in CatalogReadDto, CatalogWriteDto, and VwmyCatalog classes. This ensures consistent initialization and helps prevent null reference issues across the codebase.	2026-04-22 09:25:03 +02:00
OlgunR	1b4205219f	Set string defaults to String.Empty in CatalogReadDto Changed default values of CatTitle, CatString, and AddedWho from null! to String.Empty to prevent potential null reference issues.	2026-04-21 17:01:44 +02:00
OlgunR	b35c167648	Add [FromBody] to DTO params in controller actions Explicitly annotate DTO parameters with [FromBody] in CatalogsController (Create, Update) and MassDataController (Upsert) to ensure correct model binding from the request body and improve API clarity.	2026-04-21 15:22:33 +02:00
OlgunR	087708dcf7	Use array literal [] for empty CORS origins default Replaces Array.Empty<string>() with the C# array literal [] when defaulting the CORS allowed origins array. This is a syntactic improvement with no change in behavior.	2026-04-21 15:22:19 +02:00
OlgunR	be40c39f47	Initialize VwmyCatalog string properties with String.Empty Changed default values of CatTitle, CatString, and AddedWho from null! to String.Empty to prevent potential null reference issues and ensure safer property initialization.	2026-04-21 13:43:33 +02:00
OlgunR	4fa3bcae3d	Make dashboard change notifications async and robust Refactored DashboardChangeNotifier and IDashboardChangeNotifier to use async notification with improved error handling and logging. Updated SqlDashboardStorage to call the new async notification method after dashboard changes, ensuring non-blocking and reliable client updates.	2026-04-21 13:42:31 +02:00
OlgunR	612d8371d3	Improve exception handling with ProblemDetails responses ExceptionHandlingMiddleware now returns structured ProblemDetails responses for errors, including specific handling for InvalidOperationException (400 Bad Request) and general exceptions (500 Internal Server Error). Responses use "application/problem+json" content type and include trace IDs. ProblemDetails support is also registered in Program.cs.	2026-04-21 13:18:59 +02:00
OlgunR	b7e66ab5f9	Update MediatR and DI packages; refactor registration Upgraded to MediatR 14.1.0 and updated registration to use the new syntax. Removed MediatR.Extensions.Microsoft.DependencyInjection where no longer needed. Bumped Microsoft.Extensions.DependencyInjection.Abstractions to 10.0.0 in Application and Infrastructure projects.	2026-04-21 12:01:23 +02:00
OlgunR	95a388015a	Remove GetAllAsync method from MassDataRepository The GetAllAsync method, which returned all Massdata records, has been removed from the MassDataRepository class. No other changes were made in this commit.	2026-04-21 10:30:10 +02:00
OlgunR	c16f0483c3	Remove unused using directives from API and client files Cleaned up unnecessary System.Net and System.Net.Http.Json usings across multiple files, including controllers and API client classes, to reduce dependencies and improve code clarity.	2026-04-21 10:16:05 +02:00
OlgunR	83292f23f3	Refactor dashboard config to factory class Move DashboardConfigurator setup from Program.cs to a new static DashboardConfiguratorFactory. This centralizes dashboard file creation, data source registration, and storage logic, improving code organization and maintainability. Unused usings are cleaned up accordingly.	2026-04-21 10:09:50 +02:00
OlgunR	c73c7e63fe	Move LayoutDto to its own file and update namespace Separated LayoutDto from LayoutsController.cs into LayoutDto.cs and set its namespace to DbFirst.Application.Layouts for better code organization and maintainability.	2026-04-20 16:51:57 +02:00
OlgunR	3e78e2e2cf	Move catalog title update validation to handler Validation preventing CatTitle changes during updates is now enforced in UpdateCatalogHandler instead of the controller. The handler throws an exception if a title change is attempted. Also, streamlined UpdateProcedure handling and removed redundant CatTitle mapping logic.	2026-04-20 16:38:29 +02:00
OlgunR	05825b6815	Refactor DI: move repository registrations to Infrastructure Centralize repository service registrations in Infrastructure's DependencyInjection.cs for better maintainability and separation of concerns. Remove direct registrations from Program.cs and add necessary using statements.	2026-04-20 16:28:37 +02:00
OlgunR	4720c8f87b	Use UTC for AddedWhen timestamps in layout repository Changed AddedWhen to use DateTime.UtcNow instead of DateTime.Now to ensure timestamps are stored in UTC, avoiding issues with local time zones.	2026-04-20 16:22:18 +02:00
OlgunR	0c936d0bf9	Adopt C# 12 collection expressions for empty lists/dicts Refactored code to use C# 12 collection expressions ([]) for initializing empty lists and dictionaries instead of the older constructors. This change modernizes and simplifies collection initialization across models, services, and API clients without altering any logic.	2026-04-20 14:33:08 +02:00
OlgunR	fcbc66f8f5	Add CancellationToken support to all API client methods All API client interfaces and implementations now accept an optional CancellationToken parameter for each method. This enables consumers to cancel HTTP requests, improving responsiveness and resource management. No changes were made to core logic or return types; only method signatures and HttpClient calls were updated to support cancellation.	2026-04-20 13:50:53 +02:00
OlgunR	aab6478f9a	Refactor API clients to use interface-based DI Introduce interfaces for all API clients and update dependency injection to use these interfaces. Refactor services and components to depend on abstractions instead of concrete implementations, improving testability and maintainability.	2026-04-20 13:23:16 +02:00
OlgunR	177d418ac3	Use InvokeAsync for async state updates in BandGridBase Replaced direct StateHasChanged() calls with InvokeAsync(StateHasChanged) to ensure asynchronous state updates. This helps prevent issues that can arise from synchronous state changes during component lifecycle events or event callbacks in Blazor.	2026-04-20 12:59:27 +02:00
OlgunR	7cc88c13f3	Cache layout user to reduce localStorage access Add a private _cachedLayoutUser field to BandLayoutService and update EnsureLayoutUserAsync to cache the layout user value after first retrieval or generation. This avoids repeated localStorage calls and improves performance.	2026-04-20 11:48:50 +02:00
OlgunR	8bf172755b	Update using directives in _Imports.razor for clarity Added @using DbFirst.BlazorWebApp and reorganized the placement of @using Microsoft.Extensions.Options to improve code organization and maintain consistent dependency order.	2026-04-20 11:34:15 +02:00
OlgunR	27c8f92a3b	Refactor API base URL config to use AppSettings class Replaced direct IConfiguration usage with a strongly-typed AppSettings class for accessing the API base URL. Registered AppSettings with DI and updated Dashboard.razor to use IOptions<AppSettings>. Updated using statements and DI setup for improved type safety and centralized configuration management.	2026-04-20 11:32:45 +02:00
OlgunR	cd0a824064	Refactor grid logic into BandGridBase<TItem> base class Move shared state and methods from CatalogsGrid and MassDataGrid into BandGridBase<TItem>. This centralizes edit context handling, validation, popup header logic, row editing/deleting, and layout feedback, reducing duplication and improving maintainability. Individual grid components now only override OnEditFieldChanged for custom validation.	2026-04-20 10:52:05 +02:00
OlgunR	0008fac1d2	Refactor HTTP client registration for API clients Simplified registration of CatalogApiClient, DashboardApiClient, MassDataApiClient, and LayoutApiClient by introducing a ConfigureClient method. This method sets the BaseAddress if ApiBaseUrl is configured, removing the previous if-else logic and reducing code duplication.	2026-04-20 10:29:17 +02:00
OlgunR	4659913711	Move ApiResult<T> to ApiResult.cs with proper namespace ApiResult<T> and its static methods were relocated from CatalogApiClient.cs to a new ApiResult.cs file. The new file now includes the DbFirst.BlazorWebApp.Models namespace for better code organization.	2026-04-20 10:24:47 +02:00
OlgunR	bb23cb6629	Refactor error handling to use ApiClientHelper Replaced the private ReadErrorAsync method in LayoutApiClient with calls to ApiClientHelper.ReadErrorAsync, centralizing error handling logic for improved consistency and reuse.	2026-04-20 10:19:40 +02:00
OlgunR	b3f7df6801	Initialize SignalR hub in OnAfterRenderAsync after first render Moved SignalR hub connection setup from OnInitializedAsync to OnAfterRenderAsync, ensuring initialization occurs only after the component's first render. This prevents premature connection attempts and aligns with best practices for component lifecycle management.	2026-04-20 10:08:24 +02:00
OlgunR	3a1cb68cf0	Change OnCustomizeEditModel to synchronous void method Converted OnCustomizeEditModel in MassDataGrid.razor from async Task to synchronous void, removing asynchronous support from this method.	2026-04-17 14:28:50 +02:00
OlgunR	c93518202b	Add custom toolbar actions with icons to grids Introduce Add, Edit, and Delete buttons with Bootstrap Icons in the toolbars of CatalogsGrid and MassDataGrid. Hide the default command column by overriding ShowCommandColumn. Update BandGridBase to conditionally render the command column. Track focused row index for toolbar actions, enabling row operations via toolbar instead of the grid's built-in command column. Add Bootstrap Icons stylesheet to App.razor.	2026-04-17 12:08:39 +02:00
OlgunR	6792b426ff	Enhance grid UI: column chooser button & default widths - Set default width and hide new button for DxGridBandColumn in BandGridBase.cs - Always show column chooser button in CatalogsGrid and MassDataGrid - Add "Spalten" toolbar button to open column chooser dialog - Improves accessibility and consistency of grid column customization	2026-04-16 16:02:31 +02:00