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.

DbFirst.API/Controllers/CatalogsController.cs

@@ -50,17 +50,6 @@ public class CatalogsController : ControllerBase
     [HttpPut("{id:int}")]
     public async Task<ActionResult<CatalogReadDto>> Update(int id, 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)
         {

DbFirst.API/Controllers/LayoutsController.cs

@@ -2,6 +2,7 @@ using System.Text;
 using DbFirst.Application.Repositories;
 using DbFirst.Domain.Entities;
 using Microsoft.AspNetCore.Mvc;
+using DbFirst.Application.Layouts;
 
 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;
-    }
 }

DbFirst.API/Program.cs

@@ -2,11 +2,9 @@ using DbFirst.API.Middleware;
 using DbFirst.API.Dashboards;
 using DbFirst.API.Hubs;
 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;
@@ -51,10 +49,6 @@ 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>();

DbFirst.Application/Catalogs/Commands/UpdateCatalogHandler.cs

@@ -25,18 +25,20 @@ 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);
     }
 }

DbFirst.Application/Layouts/LayoutDto.cs

@@ -0,0 +1,9 @@
+namespace DbFirst.Application.Layouts;
+
+public 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;
+}

DbFirst.BlazorWebApp/AppSettings.cs

@@ -0,0 +1,6 @@
+namespace DbFirst.BlazorWebApp;
+
+public class AppSettings
+{
+    public string ApiBaseUrl { get; set; } = string.Empty;
+}

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 ---
@@ -147,12 +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 }));
     }
 
@@ -216,4 +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;
+    }
+
 }

DbFirst.BlazorWebApp/Components/CatalogsGrid.razor

@@ -1,5 +1,5 @@
 @inherits BandGridBase<CatalogReadDto>
-@inject CatalogApiClient Api
+@inject ICatalogApiClient Api
 
 @if (!string.IsNullOrWhiteSpace(errorMessage))
 {
@@ -149,14 +149,7 @@ 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;
@@ -209,17 +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;
 
@@ -237,8 +220,6 @@ else
         }
     }
 
-    private void SetPopupHeaderText(bool isNew) => popupHeaderText = isNew ? "Neu" : "Edit";
-
     private void OnCustomizeEditModel(GridCustomizeEditModelEventArgs e)
     {
         popupHeaderText = e.IsNew ? "Neu" : "Edit";
@@ -378,36 +359,4 @@ else
         public int Value { get; set; }
         public string Text { get; set; } = string.Empty;
     }
-
-    private int _focusedVisibleIndex;
-
-    private async Task EditFocusedRow()
-        => await gridRef!.StartEditRowAsync(_focusedVisibleIndex);
-
-    private Task DeleteFocusedRow()
-    {
-        gridRef!.ShowRowDeleteConfirmation(_focusedVisibleIndex);
-        return Task.CompletedTask;
-    }
-
-    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;
-    }
 }

DbFirst.BlazorWebApp/Components/MassDataGrid.razor

@@ -1,5 +1,5 @@
 @inherits BandGridBase<MassDataReadDto>
-@inject MassDataApiClient Api
+@inject IMassDataApiClient Api
 
 @if (!string.IsNullOrWhiteSpace(errorMessage))
 {
@@ -175,16 +175,9 @@ 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";
@@ -259,17 +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))
@@ -285,8 +268,6 @@ else
         }
     }
 
-    private void SetPopupHeaderText(bool isNew) => popupHeaderText = isNew ? "Neu" : "Edit";
-
     private void OnCustomizeEditModel(GridCustomizeEditModelEventArgs e)
     {
         if (e.IsNew)
@@ -391,36 +372,4 @@ else
         public int? Value { get; set; }
         public string Text { get; set; } = string.Empty;
     }
-
-    private int _focusedVisibleIndex;
-
-    private async Task EditFocusedRow()
-        => await gridRef!.StartEditRowAsync(_focusedVisibleIndex);
-
-    private Task DeleteFocusedRow()
-    {
-        gridRef!.ShowRowDeleteConfirmation(_focusedVisibleIndex);
-        return Task.CompletedTask;
-    }
-
-    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;
-    }
 }

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)

DbFirst.BlazorWebApp/Components/_Imports.razor

@@ -18,3 +18,4 @@
 @using DevExpress.DashboardBlazor
 @using DevExpress.DashboardWeb
 @using DevExpress.Data.Filtering
+@using Microsoft.Extensions.Options

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);
+}

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

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.

DbFirst.BlazorWebApp/Services/BandLayoutService.cs

@@ -5,20 +5,26 @@ 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)
             {

DbFirst.BlazorWebApp/Services/CatalogApiClient.cs

@@ -4,7 +4,7 @@ using DbFirst.BlazorWebApp.Models;
 
 namespace DbFirst.BlazorWebApp.Services;
 
-public class CatalogApiClient
+public class CatalogApiClient : ICatalogApiClient
 {
     private readonly HttpClient _httpClient;
     private const string Endpoint = "api/catalogs";
@@ -14,20 +14,20 @@ 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 +38,9 @@ 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 +50,9 @@ 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);
@@ -62,10 +62,3 @@ public class CatalogApiClient
         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);
-}
-

DbFirst.BlazorWebApp/Services/DashboardApiClient.cs

@@ -3,7 +3,7 @@ using DbFirst.BlazorWebApp.Models;
 
 namespace DbFirst.BlazorWebApp.Services;
 
-public class DashboardApiClient
+public class DashboardApiClient : IDashboardApiClient
 {
     private readonly HttpClient _httpClient;
     private const string Endpoint = "api/dashboard/dashboards";
@@ -13,9 +13,9 @@ 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 ?? [];
     }
 }

DbFirst.BlazorWebApp/Services/ICatalogApiClient.cs

@@ -0,0 +1,12 @@
+using DbFirst.BlazorWebApp.Models;
+
+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);
+}

DbFirst.BlazorWebApp/Services/IDashboardApiClient.cs

@@ -0,0 +1,9 @@
+using DbFirst.BlazorWebApp.Models;
+
+namespace DbFirst.BlazorWebApp.Services
+{
+    public interface IDashboardApiClient
+    {
+        Task<List<DashboardInfoDto>> GetAllAsync(CancellationToken ct = default);
+    }
+}

DbFirst.BlazorWebApp/Services/ILayoutApiClient.cs

@@ -0,0 +1,11 @@
+using DbFirst.BlazorWebApp.Models;
+
+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);
+    }
+}

DbFirst.BlazorWebApp/Services/IMassDataApiClient.cs

@@ -0,0 +1,12 @@
+using DbFirst.BlazorWebApp.Models;
+
+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);
+    }
+}

DbFirst.BlazorWebApp/Services/LayoutApiClient.cs

@@ -3,7 +3,7 @@ using DbFirst.BlazorWebApp.Models;
 
 namespace DbFirst.BlazorWebApp.Services;
 
-public class LayoutApiClient
+public class LayoutApiClient : ILayoutApiClient
 {
     private readonly HttpClient _httpClient;
     private const string Endpoint = "api/layouts";
@@ -13,10 +13,10 @@ 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 +26,12 @@ 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 +39,10 @@ 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;

DbFirst.BlazorWebApp/Services/MassDataApiClient.cs

@@ -3,7 +3,7 @@ using DbFirst.BlazorWebApp.Models;
 
 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;

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;
     }
 }

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);
         }