c# - 当按钮获得焦点时，WPF阻止执行命令

Question

我有带有文本框和按钮的应用程序。当我在文本框中单击 ENTER 时，我想将焦点设置在按钮上（使用遍历），但是当按钮获得焦点时，执行命令。当按钮获得焦点时，我不想执行命令。这是我的代码：

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"); });
    }

如何在不执行命令的情况下将焦点设置在按钮上？谢谢

标签： c#wpf

Answer 1

设置焦点时仍启用 KeyDown 事件。解决方案是：

 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;
 }