WPF阻止按鈕獲得焦點時執行命令

Question

我有文本框和按鈕的應用程序。 當我在文本框中單擊ENTER時，我想將焦點設置在按鈕上（使用遍歷），但是當按鈕獲得焦點時，執行命令。 當按鈕獲得焦點時，我不想執行命令。 這是我的代碼：

View1.xaml

<TextBox PreviewKeyDown="UIElement_OnPreviewKeyDown"/>

View1.xaml.cs

 private void UIElement_OnPreviewKeyDown(object sender, KeyEventArgs e)
 {
    if (e.Key != Key.Return) return;
    TraversalRequest tRequest = new TraversalRequest(FocusNavigationDirection.Next);
    UIElement keyboardFocus = Keyboard.FocusedElement as UIElement;
    keyboardFocus?.MoveFocus(tRequest);
 }

View2.xaml

<Button Content="Testbutton" Command="{Binding TestCommand}"/>

View2Vm

   class View2Vm : BaseVm
    {
      public RelayCommand TestCommand { get; set; }

      public View2Vm() 
        => TestCommand = new RelayCommand(x => { MessageBox.Show("Message"); });
    }

如何在不執行命令的情況下將焦點設置在按鈕上？ 謝謝

Answer 1

設置焦點后，仍會啟用KeyDown事件。 解決方法是：

 private void UIElement_OnPreviewKeyDown(object sender, KeyEventArgs e)
 {
    if (e.Key != Key.Return) return;
    TraversalRequest tRequest = new TraversalRequest(FocusNavigationDirection.Next);
    UIElement keyboardFocus = Keyboard.FocusedElement as UIElement;
    keyboardFocus?.MoveFocus(tRequest);
    e.Handled = true;
 }