WPF RoutedCommand 和 CustomControl 实现

Question

我有一个窗口，其中有一个按钮和一个自定义控件。当我单击按钮时，CustomControl 应该做一些事情（例如动画本身）。

代码如下：

public static class Commands
{
    public static readonly RoutedCommand FooCommand = new RoutedCommand("Foo", typeof(MyCustomControl));
}

public class MyCustomControl : Control
{
    static MyCustomControl()
    {
      // Initialize as lookless control
      DefaultStyleKeyProperty.OverrideMetadata(typeof(MyCustomControl), new FrameworkPropertyMetadata(typeof(MyCustomControl)));

      // for some reason using typeof(MyCustomControl) doesn't seem to work. (not part of the same visual tree?)
      // typeof(UIElement) works, as button is a UIElement (?)
      //CommandManager.RegisterClassCommandBinding(typeof(MyCustomControl), new CommandBinding(Commands.FooCommand, OnFoo, OnCanFoo));
      CommandManager.RegisterClassCommandBinding(typeof(UIElement), new CommandBinding(Commands.FooCommand, OnFoo, OnCanFoo));
    }

    private static void OnFoo(object sender, RoutedEventArgs e)
    {
        // here I need to have the instance of MyCustomControl so that I can call myCustCtrl.Foo();
      Foo(); // <--- problem! can't access this
    }

    private static void OnCanFoo(object sender, CanExecuteRoutedEventArgs e)
    {
      e.CanExecute = true;
      e.Handled = true;
    }

    public void Foo()
    {
        // does this like:
        // this.Template.FindName(...
        // so this method can't be static
    }
}

以及我使用控件的 XAML：

<Window ...
  <!-- ... -->

<Grid>
<Grid.RowDefinitions>
    <RowDefinition Height="auto" />
    <RowDefinition Height="*" />
</Grid.RowDefinitions>

<Button Content="Do a foo!" Command="{Binding my:MyCustomControl.FooCommand}" />

<my:MyCustomControl Grid.Row="1">
    <!-- ... -->

    <!-- ... -->
</my:MyCustomControl>
</Grid>

<!-- ... -->
</Window>

问题出在 MyCustomControl 的“OnFoo”方法中。此方法是静态的，我需要访问 MyCustomControl 的方法“Foo()”。

关于如何做到这一点的任何建议？

Answer 1

您不能将sender 输入参数强制转换为您的类的实例吗？

private static void OnFoo(object sender, RoutedEventArgs e)
{
    ((MyCustomControl)sender).Foo();
}