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因为Canvas中我们没有绑定命令，所以在Canvas上无法引发事件，于是，向上路由到DockPanel，所以后两次事件的触发者都是DockPanel。
接下来，我们还要动手做第三个示例，示例不通过控件来执行命令，而是通过快捷键Ctrl + Alt + Y来激活。
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public partial class Window1 : Window
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public static RoutedCommand MyCmd = new RoutedCommand();
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public Window1()
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{
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InitializeComponent();
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CommandManager.AddCanExecuteHandler(this, this.Cmd_CanExeHandler);
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CommandManager.AddExecutedHandler(this, this.Cmd_ExeHandler);
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this.InputBindings.Add(new KeyBinding(
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MyCmd,
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Key.Y,
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ModifierKeys.Control | ModifierKeys.Alt));
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}
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private void Cmd_CanExeHandler(object sender, CanExecuteRoutedEventArgs e)
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{
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e.CanExecute = true;
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}
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private void Cmd_ExeHandler(object sender, ExecutedRoutedEventArgs e)
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{
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MessageBox.Show("命令已执行。");
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}
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