Change OnCustomizeEditModel to synchronous void method

Converted OnCustomizeEditModel in MassDataGrid.razor from async Task to synchronous void, removing asynchronous support from this method.

DbFirst.BlazorWebApp/Components/App.razor

@@ -18,6 +18,7 @@
     <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" />

DbFirst.BlazorWebApp/Components/BandGridBase.cs

@@ -103,6 +103,8 @@ 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" });
@@ -172,9 +174,12 @@ public abstract class BandGridBase<TItem> : ComponentBase
     protected RenderFragment RenderColumns() => builder =>
     {
         var seq = 0;
-        builder.OpenComponent<DxGridCommandColumn>(seq++);
+        if (ShowCommandColumn)
-        builder.AddAttribute(seq++, "Width", "120px");
+        {
-        builder.CloseComponent();
+            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)))
@@ -184,8 +189,6 @@ public abstract class BandGridBase<TItem> : ComponentBase
         {
             if (band.Columns.Count == 0) continue;
             builder.OpenComponent<DxGridBandColumn>(seq++);
-            builder.AddAttribute(seq++, "Width", "120px");
-            builder.AddAttribute(seq++, "NewButtonVisible", false); // falls noch nicht vorhanden
             builder.AddAttribute(seq++, "Caption", band.Caption);
             builder.AddAttribute(seq++, "Columns", (RenderFragment)(bandBuilder =>
             {

DbFirst.BlazorWebApp/Components/CatalogsGrid.razor

@@ -59,9 +59,34 @@ 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"
@@ -134,6 +159,7 @@ else
     private string popupHeaderText = "Edit";
 
     protected override string LayoutKey => "CatalogsGrid";
+    protected override bool ShowCommandColumn => false;
 
     protected override List<ColumnDefinition> ColumnDefinitions { get; } = new()
 {
@@ -353,6 +379,17 @@ else
         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

DbFirst.BlazorWebApp/Components/MassDataGrid.razor

@@ -72,9 +72,34 @@ 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"
@@ -163,6 +188,7 @@ else
     private int? focusedRowKey;
 
     protected override string LayoutKey => "MassDataGrid";
+    protected override bool ShowCommandColumn => false;
 
     protected override List<ColumnDefinition> ColumnDefinitions { get; } = new()
 {
@@ -261,7 +287,7 @@ else
 
     private void SetPopupHeaderText(bool isNew) => popupHeaderText = isNew ? "Neu" : "Edit";
 
-    private async Task OnCustomizeEditModel(GridCustomizeEditModelEventArgs e)
+    private void OnCustomizeEditModel(GridCustomizeEditModelEventArgs e)
     {
         if (e.IsNew)
         {
@@ -366,6 +392,17 @@ else
         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