fixed copy command. was not working on all instances of MultiFormatDataView. with adapted binding it works.

MultiTerm.Wpf.CustomControl/MultiFormatDataView/MultiFormatDataView.cs

@@ -58,10 +58,6 @@ public class MultiFormatDataView : Control
 
     public static readonly RoutedEvent ClearRequestedEvent;
 
-    public static readonly DependencyProperty CopyCommandProperty =
-        DependencyProperty.Register("CopyCommand", 
-        typeof(RoutedCommand), typeof(MultiFormatDataView));
-
     /// <summary>
     /// .NET Property for <see cref="DataSourceProperty"/>.
     /// </summary>
@@ -119,35 +115,43 @@ public class MultiFormatDataView : Control
         remove { this.RemoveHandler(ClearRequestedEvent, value); }
     }
 
-    private static RoutedCommand? copyCommand;
     /// <summary>
-    /// .NET Property for <see cref="CopyCommandProperty"/>
+    /// Binding that binds the <see cref="copyCommand"/> to the internal method <see cref="CopyCommand_Executed(object, ExecutedRoutedEventArgs)"/>.
+    /// </summary>
+    private static CommandBinding copyCommandBinding;
+    /// <summary>
+    /// Routed command that is called from the template.
     /// </summary>
+    private static RoutedCommand? copyCommand;
     public static RoutedCommand? CopyCommand
     {
         get { return copyCommand; }
     }
+
     #endregion
 
-    public MultiFormatDataView()
+    static MultiFormatDataView()
     {
+        DefaultStyleKeyProperty.OverrideMetadata(typeof(MultiFormatDataView), new FrameworkPropertyMetadata(typeof(MultiFormatDataView)));
+
+        // register clear event
+        ClearRequestedEvent = EventManager.RegisterRoutedEvent("ClearRequested",
+            RoutingStrategy.Bubble, typeof(RoutedEventArgs),
+            typeof(MultiFormatDataView));
+
         // register copy command
         copyCommand = new RoutedCommand("CopyCommand", typeof(MultiFormatDataView));
-        var binding = new CommandBinding
+        copyCommandBinding = new CommandBinding
         {
             Command = copyCommand
         };
-        binding.Executed += CopyCommand_Executed; ;
-        CommandBindings.Add(binding);
+        copyCommandBinding.Executed += CopyCommand_Executed; ;
     }
 
-    static MultiFormatDataView()
+    public MultiFormatDataView()
     {
-        DefaultStyleKeyProperty.OverrideMetadata(typeof(MultiFormatDataView), new FrameworkPropertyMetadata(typeof(MultiFormatDataView)));
-
-        ClearRequestedEvent = EventManager.RegisterRoutedEvent("ClearRequested",
-            RoutingStrategy.Bubble, typeof(RoutedEventArgs),
-            typeof(MultiFormatDataView));
+        // add copy command binding on each instance
+        CommandBindings.Add(copyCommandBinding);
     }
 
     public override void OnApplyTemplate()
@@ -254,18 +258,23 @@ public class MultiFormatDataView : Control
         RaiseEvent(args);
     }
 
-    private void CopyCommand_Executed(object sender, ExecutedRoutedEventArgs e)
+    private static void CopyCommand_Executed(object sender, ExecutedRoutedEventArgs e)
     {
+        // guard null and check if source is correct
+        if(e.Source == null || e.Source is not MultiFormatDataView mfdv)
+        { return; }
+
+        // copy to clipboard according to type
         switch (e.Parameter.ToString())
         {
             case "Character":
-                Clipboard.SetText(this.DataSource.GetSelectedDataAsString(Core.Types.FormatType.Character));
+                Clipboard.SetText(mfdv.DataSource.GetSelectedDataAsString(Core.Types.FormatType.Character));
                 break;
             case "Hexadecimal":
-                Clipboard.SetText(this.DataSource.GetSelectedDataAsString(Core.Types.FormatType.Hexadecimal));
+                Clipboard.SetText(mfdv.DataSource.GetSelectedDataAsString(Core.Types.FormatType.Hexadecimal));
                 break;
             case "Binary":
-                Clipboard.SetText(this.DataSource.GetSelectedDataAsString(Core.Types.FormatType.Binary));
+                Clipboard.SetText(mfdv.DataSource.GetSelectedDataAsString(Core.Types.FormatType.Binary));
                 break;
             default:
                 throw new ArgumentException($"'{CopyCommand_Executed}()' does not have handling implemented for CommandParameter={e.Parameter}");