Refactor API clients to use primary constructor for HttpClient

Refactored CatalogApiClient, DashboardApiClient, LayoutApiClient, and MassDataApiClient to use C# primary constructor syntax for injecting HttpClient. Removed private _httpClient fields and updated all usages to reference the constructor parameter directly. This change simplifies the code and modernizes dependency injection without altering any API logic.

DbFirst.BlazorWebApp/Components/BandGridBase.cs

@@ -132,13 +132,13 @@ public abstract class BandGridBase<TItem> : ComponentBase
         UpdateBandOptions();
     }
 
-    protected void RemoveBand(BandDefinition band)
+    protected async Task RemoveBand(BandDefinition band)
     {
         bandLayout.Bands.Remove(band);
         foreach (var key in columnBandAssignments.Where(p => p.Value == band.Id).Select(p => p.Key).ToList())
             columnBandAssignments.Remove(key);
         UpdateBandOptions();
-        SyncBandsFromAssignments();
+        await SyncBandsFromAssignments();
     }
 
     protected void UpdateBandCaption(BandDefinition band, string value)
@@ -147,19 +147,19 @@ public abstract class BandGridBase<TItem> : ComponentBase
         UpdateBandOptions();
     }
 
-    protected void UpdateColumnBand(string fieldName, string? bandId)
+    protected async Task UpdateColumnBand(string fieldName, string? bandId)
     {
         if (string.IsNullOrWhiteSpace(bandId))
             columnBandAssignments.Remove(fieldName);
         else
             columnBandAssignments[fieldName] = bandId;
-        SyncBandsFromAssignments();
+        await SyncBandsFromAssignments();
     }
 
     protected string GetColumnBand(string fieldName)
         => columnBandAssignments.TryGetValue(fieldName, out var bandId) ? bandId : string.Empty;
 
-    protected void SyncBandsFromAssignments()
+    protected async Task SyncBandsFromAssignments()
     {
         foreach (var band in bandLayout.Bands)
         {
@@ -168,7 +168,7 @@ public abstract class BandGridBase<TItem> : ComponentBase
                 .Select(c => c.FieldName)
                 .ToList();
         }
-        _ = InvokeAsync(StateHasChanged);
+        await InvokeAsync(StateHasChanged);
     }
 
     protected void UpdateBandOptions()
@@ -245,8 +245,8 @@ public abstract class BandGridBase<TItem> : ComponentBase
         if (!_dateFilterTemplates.TryGetValue(fieldName, out var template))
         {
             // EventCallbacks einmalig erstellen – stabile Referenzen über alle Renders
-            _fromCallbacks[fieldName] = EventCallback.Factory.Create<DateTime?>(this, (DateTime? v) => OnFilterFromChanged(fieldName, v));
+            _fromCallbacks[fieldName] = EventCallback.Factory.Create<DateTime?>(this, async (DateTime? v) => await OnFilterFromChanged(fieldName, v));
-            _toCallbacks[fieldName] = EventCallback.Factory.Create<DateTime?>(this, (DateTime? v) => OnFilterToChanged(fieldName, v));
+            _toCallbacks[fieldName] = EventCallback.Factory.Create<DateTime?>(this, async (DateTime? v) => await OnFilterToChanged(fieldName, v));
             template = BuildDateFilterTemplate(fieldName);
             _dateFilterTemplates[fieldName] = template;
         }
@@ -330,19 +330,19 @@ public abstract class BandGridBase<TItem> : ComponentBase
         else if (op.OperatorType == BinaryOperatorType.Less) to = dt.AddDays(-1);
     }
 
-    private void OnFilterFromChanged(string fieldName, DateTime? value)
+    private async Task OnFilterFromChanged(string fieldName, DateTime? value)
     {
         _filterFrom[fieldName] = value;
-        ApplyDateFilter(fieldName);
+        await ApplyDateFilter(fieldName);
     }
 
-    private void OnFilterToChanged(string fieldName, DateTime? value)
+    private async Task OnFilterToChanged(string fieldName, DateTime? value)
     {
         _filterTo[fieldName] = value;
-        ApplyDateFilter(fieldName);
+        await ApplyDateFilter(fieldName);
     }
 
-    private void ApplyDateFilter(string fieldName)
+    private async Task ApplyDateFilter(string fieldName)
     {
         var ops = new List<CriteriaOperator>();
         if (_filterFrom.TryGetValue(fieldName, out var from) && from.HasValue)
@@ -360,7 +360,7 @@ public abstract class BandGridBase<TItem> : ComponentBase
         gridRef?.SetFieldFilterCriteria(fieldName, criteria);
         if (_filterContexts.TryGetValue(fieldName, out var ctx))
             ctx.FilterCriteria = criteria;
-        _ = InvokeAsync(StateHasChanged);
+        await InvokeAsync(StateHasChanged);
     }
 
     protected void SetEditContext(EditContext context)

DbFirst.BlazorWebApp/Components/CatalogsGrid.razor

@@ -117,7 +117,8 @@ else
             </Columns>
             <EditFormTemplate Context="editFormContext">
                 @{
-                    SetEditContext(editFormContext.EditContext); var editModel = (CatalogEditModel)editFormContext.EditModel; SetPopupHeaderText(editModel.IsNew);
+                    SetEditContext(editFormContext.EditContext);
+                    var editModel = (CatalogEditModel)editFormContext.EditModel;
                 }
                 <DxFormLayout ColCount="2">
                     <DxFormLayoutItem Caption="Titel">
@@ -173,12 +174,16 @@ else
 
     protected override async Task OnInitializedAsync()
     {
-        await InitializeBandLayoutAsync();
         await LoadCatalogs();
     }
 
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
+        if (firstRender)
+        {
+            await InitializeBandLayoutAsync();
+            StateHasChanged();
+        }
         await ApplyGridLayoutAfterRenderAsync();
     }
 

DbFirst.BlazorWebApp/Components/Layout/MainLayout.razor

@@ -50,13 +50,14 @@
         await ApplyDxDarkOverrideAsync();
     }
 
-    private async void OnThemeChanged()
+    private void OnThemeChanged()
+    {
+        InvokeAsync(async () =>
         {
             StateHasChanged();
             if (_isInteractive)
-        {
              await ApplyDxDarkOverrideAsync();
-        }
+        });
     }
 
     private async Task ApplyDxDarkOverrideAsync()

DbFirst.BlazorWebApp/Components/MassDataGrid.razor

@@ -137,7 +137,7 @@ else
                         <DxTextBox @bind-Text="editModel.CustomerName" Width="100%" />
                     </DxFormLayoutItem>
                     <DxFormLayoutItem Caption="Amount">
-                        <DxTextBox @bind-Text="editModel.AmountText" Width="100%" />
+                        <DxSpinEdit @bind-Value="editModel.Amount" MinValue="0" DisplayFormat="c2" Width="100%" />
                     </DxFormLayoutItem>
                     <DxFormLayoutItem Caption="Category">
                         <DxTextBox @bind-Text="editModel.Category" Width="100%" ReadOnly="@(!editModel.IsNew)" />
@@ -210,12 +210,16 @@ else
 
     protected override async Task OnInitializedAsync()
     {
-        await InitializeBandLayoutAsync();
         await LoadPage(0);
     }
 
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
+        if (firstRender)
+        {
+            await InitializeBandLayoutAsync();
+            StateHasChanged();
+        }
         await ApplyGridLayoutAfterRenderAsync();
     }
 
@@ -281,7 +285,7 @@ else
         {
             Id = item.Id,
             CustomerName = item.CustomerName,
-            AmountText = item.Amount.ToString("0.00"),
+            Amount = item.Amount,
             Category = item.Category,
             StatusFlag = item.StatusFlag,
             UpdateProcedure = procedureOptions[0].Value,
@@ -298,12 +302,6 @@ else
         validationMessageStore?.Clear();
         editContext?.NotifyValidationStateChanged();
         var editModel = (MassDataEditModel)e.EditModel;
-        if (!decimal.TryParse(editModel.AmountText, out var amount))
-        {
-            AddValidationError(editModel, nameof(MassDataEditModel.AmountText), "Amount ist ungültig.");
-            e.Cancel = true;
-            return;
-        }
         if (editModel.IsNew)
         {
             var existing = await Api.GetByCustomerNameAsync(editModel.CustomerName);
@@ -317,7 +315,7 @@ else
         var dto = new MassDataWriteDto
         {
             CustomerName = editModel.CustomerName,
-            Amount = amount,
+            Amount = editModel.Amount,
             Category = editModel.Category,
             StatusFlag = editModel.StatusFlag
         };
@@ -353,7 +351,7 @@ else
     {
         public int Id { get; set; }
         public string CustomerName { get; set; } = string.Empty;
-        public string AmountText { get; set; } = string.Empty;
+        public decimal Amount { get; set; }
         public string Category { get; set; } = string.Empty;
         public bool StatusFlag { get; set; }
         public int UpdateProcedure { get; set; }

DbFirst.BlazorWebApp/Program.cs

@@ -13,12 +13,12 @@ builder.Services.AddDevExpressBlazor(options => options.BootstrapVersion = Boots
 builder.Services.AddScoped<ThemeState>();
 builder.Services.AddScoped<BandLayoutService>();
 
-var apiBaseUrl = builder.Configuration["ApiBaseUrl"];
 builder.Services.Configure<AppSettings>(builder.Configuration);
+var appSettings = builder.Configuration.Get<AppSettings>() ?? new AppSettings();
 void ConfigureClient(HttpClient client)
 {
-    if (!string.IsNullOrWhiteSpace(apiBaseUrl))
+    if (!string.IsNullOrWhiteSpace(appSettings.ApiBaseUrl))
-        client.BaseAddress = new Uri(apiBaseUrl);
+        client.BaseAddress = new Uri(appSettings.ApiBaseUrl);
 }
 
 builder.Services.AddHttpClient<ICatalogApiClient, CatalogApiClient>(ConfigureClient);

DbFirst.BlazorWebApp/Services/ApiClientHelper.cs

@@ -1,4 +1,5 @@
 using System.Net;
+using System.Text.Json;
 
 namespace DbFirst.BlazorWebApp.Services;
 
@@ -25,7 +26,14 @@ internal static class ApiClientHelper
                 problemDetail = problem.Detail ?? problem.Type;
             }
         }
-        catch { }
+        catch (JsonException)
+        {
+            // Ignoriere Fehler beim Lesen der Problem-Details, da sie optional sind
+        }
+        catch (NotSupportedException)
+        {
+            // Ignoriere Fehler beim Lesen der Problem-Details, da sie optional sind
+        }
 
         var status = response.StatusCode;
         var reason = response.ReasonPhrase;

DbFirst.BlazorWebApp/Services/CatalogApiClient.cs

@@ -3,30 +3,24 @@ using DbFirst.Contracts.Catalogs;
 
 namespace DbFirst.BlazorWebApp.Services;
 
-public class CatalogApiClient : ICatalogApiClient
+public class CatalogApiClient(HttpClient httpClient) : ICatalogApiClient
 {
-    private readonly HttpClient _httpClient;
     private const string Endpoint = "api/catalogs";
 
-    public CatalogApiClient(HttpClient httpClient)
-    {
-        _httpClient = httpClient;
-    }
-
     public async Task<List<CatalogReadDto>> GetAllAsync(CancellationToken ct = default)
     {
-        var result = await _httpClient.GetFromJsonAsync<List<CatalogReadDto>>(Endpoint, ct);
+        var result = await httpClient.GetFromJsonAsync<List<CatalogReadDto>>(Endpoint, ct);
         return result ?? [];
     }
 
     public async Task<CatalogReadDto?> GetByIdAsync(int id, CancellationToken ct = default)
     {
-        return await _httpClient.GetFromJsonAsync<CatalogReadDto>($"{Endpoint}/{id}", ct);
+        return await httpClient.GetFromJsonAsync<CatalogReadDto>($"{Endpoint}/{id}", ct);
     }
 
     public async Task<ApiResult<CatalogReadDto?>> CreateAsync(CatalogWriteDto dto, CancellationToken ct = default)
     {
-        var response = await _httpClient.PostAsJsonAsync(Endpoint, dto, ct);
+        var response = await httpClient.PostAsJsonAsync(Endpoint, dto, ct);
         if (response.IsSuccessStatusCode)
         {
             var payload = await response.Content.ReadFromJsonAsync<CatalogReadDto>();
@@ -39,7 +33,7 @@ public class CatalogApiClient : ICatalogApiClient
 
     public async Task<ApiResult<bool>> UpdateAsync(int id, CatalogWriteDto dto, CancellationToken ct = default)
     {
-        var response = await _httpClient.PutAsJsonAsync($"{Endpoint}/{id}", dto, ct);
+        var response = await httpClient.PutAsJsonAsync($"{Endpoint}/{id}", dto, ct);
         if (response.IsSuccessStatusCode)
         {
             return ApiResult<bool>.Ok(true);
@@ -51,7 +45,7 @@ public class CatalogApiClient : ICatalogApiClient
 
     public async Task<ApiResult<bool>> DeleteAsync(int id, CancellationToken ct = default)
     {
-        var response = await _httpClient.DeleteAsync($"{Endpoint}/{id}", ct);
+        var response = await httpClient.DeleteAsync($"{Endpoint}/{id}", ct);
         if (response.IsSuccessStatusCode)
         {
             return ApiResult<bool>.Ok(true);

DbFirst.BlazorWebApp/Services/DashboardApiClient.cs

@@ -2,19 +2,13 @@ using DbFirst.Contracts.Dashboards;
 
 namespace DbFirst.BlazorWebApp.Services;
 
-public class DashboardApiClient : IDashboardApiClient
+public class DashboardApiClient(HttpClient httpClient) : IDashboardApiClient
 {
-    private readonly HttpClient _httpClient;
     private const string Endpoint = "api/dashboard/dashboards";
 
-    public DashboardApiClient(HttpClient httpClient)
-    {
-        _httpClient = httpClient;
-    }
-
     public async Task<List<DashboardInfoDto>> GetAllAsync(CancellationToken ct = default)
     {
-        var result = await _httpClient.GetFromJsonAsync<List<DashboardInfoDto>>(Endpoint, ct);
+        var result = await httpClient.GetFromJsonAsync<List<DashboardInfoDto>>(Endpoint, ct);
         return result ?? [];
     }
 }

DbFirst.BlazorWebApp/Services/LayoutApiClient.cs

@@ -2,20 +2,14 @@ using DbFirst.Contracts.Layouts;
 
 namespace DbFirst.BlazorWebApp.Services;
 
-public class LayoutApiClient : ILayoutApiClient
+public class LayoutApiClient(HttpClient httpClient) : ILayoutApiClient
 {
-    private readonly HttpClient _httpClient;
     private const string Endpoint = "api/layouts";
 
-    public LayoutApiClient(HttpClient httpClient)
-    {
-        _httpClient = httpClient;
-    }
-
     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, ct);
+        var response = await httpClient.GetAsync(url, ct);
         if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
         {
             return null;
@@ -27,7 +21,7 @@ public class LayoutApiClient : ILayoutApiClient
 
     public async Task<LayoutDto> UpsertAsync(LayoutDto dto, CancellationToken ct = default)
     {
-        var response = await _httpClient.PostAsJsonAsync(Endpoint, dto, ct);
+        var response = await httpClient.PostAsJsonAsync(Endpoint, dto, ct);
         if (!response.IsSuccessStatusCode)
         {
             var detail = await ApiClientHelper.ReadErrorAsync(response);
@@ -41,7 +35,7 @@ public class LayoutApiClient : ILayoutApiClient
     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, ct);
+        var response = await httpClient.DeleteAsync(url, ct);
         if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
         {
             return;

DbFirst.BlazorWebApp/Services/MassDataApiClient.cs

@@ -1,44 +1,33 @@
 using DbFirst.BlazorWebApp.Models;
 using DbFirst.Contracts.MassData;
+using Microsoft.AspNetCore.WebUtilities;
 
 namespace DbFirst.BlazorWebApp.Services;
 
-public class MassDataApiClient : IMassDataApiClient
+public class MassDataApiClient(HttpClient httpClient) : IMassDataApiClient
 {
-    private readonly HttpClient _httpClient;
     private const string Endpoint = "api/massdata";
 
-    public MassDataApiClient(HttpClient httpClient)
-    {
-        _httpClient = httpClient;
-    }
-
     public async Task<int> GetCountAsync(CancellationToken ct = default)
     {
-        var result = await _httpClient.GetFromJsonAsync<int?>("api/massdata/count", ct);
+        var result = await httpClient.GetFromJsonAsync<int?>("api/massdata/count", ct);
         return result ?? 0;
     }
 
     public async Task<List<MassDataReadDto>> GetAllAsync(int? skip, int? take, CancellationToken ct = default)
     {
-        var query = new List<string>();
+        var query = new Dictionary<string, string?>();
-        if (skip.HasValue)
+        if (skip.HasValue) query["skip"] = skip.Value.ToString();
-        {
+        if (take.HasValue) query["take"] = take.Value.ToString();
-            query.Add($"skip={skip.Value}");
-        }
-        if (take.HasValue)
-        {
-            query.Add($"take={take.Value}");
-        }
 
-        var url = query.Count == 0 ? Endpoint : $"{Endpoint}?{string.Join("&", query)}";
+        var url = QueryHelpers.AddQueryString(Endpoint, query);
-        var result = await _httpClient.GetFromJsonAsync<List<MassDataReadDto>>(url, ct);
+        var result = await httpClient.GetFromJsonAsync<List<MassDataReadDto>>(url, ct);
         return result ?? [];
     }
 
     public async Task<ApiResult<MassDataReadDto?>> UpsertAsync(MassDataWriteDto dto, CancellationToken ct = default)
     {
-        var response = await _httpClient.PostAsJsonAsync($"{Endpoint}/upsert", dto, ct);
+        var response = await httpClient.PostAsJsonAsync($"{Endpoint}/upsert", dto, ct);
         if (response.IsSuccessStatusCode)
         {
             var payload = await response.Content.ReadFromJsonAsync<MassDataReadDto>();
@@ -56,7 +45,7 @@ public class MassDataApiClient : IMassDataApiClient
             return null;
         }
 
-        var response = await _httpClient.GetAsync($"{Endpoint}/{Uri.EscapeDataString(customerName)}", ct);
+        var response = await httpClient.GetAsync($"{Endpoint}/{Uri.EscapeDataString(customerName)}", ct);
         if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
         {
             return null;