使用XAML标记的F＃事件处理程序

Question

现在我有一个Custom Routed Event，我该如何在XAML中指定处理程序？

<Window.Resources> 
    <Style TargetType="Grid"> 
     <Setter Property="funk:Tap.Handler" 
       Value="{Binding TapHandler}"/> 
    </Style> 
</Window.Resources> 

允许：

• UI元素来处理起泡或隧道RoutedEvents，而不仅仅是控制提高他们
• 使用隐式风格的，无需接线事件的每一个的UIElement某些类型
• 基于ViewModel中逻辑的处理程序的更改
• a没有代码隐藏的视图

Answer 1

使用附加属性（基于this post）

type Tap() = 
    inherit DependencyObject() 

    // For easy exchange 
    static let routedEvent = MyButtonSimple.TapEvent 

    static let HandlerProperty = 
     DependencyProperty.RegisterAttached 
      ("Handler", typeof<RoutedEventHandler>, 
       typeof<Tap>, new PropertyMetadata(null)) 

    static let OnEvent (sender : obj) args = 
     let control = sender :?> UIElement 
     let handler = control.GetValue(HandlerProperty) :?> RoutedEventHandler 
     if not <| ((handler, null) ||> LanguagePrimitives.PhysicalEquality) then 
      handler.Invoke(sender, args) 

    static do EventManager.RegisterClassHandler(
       typeof<FrameworkElement>, routedEvent, 
        RoutedEventHandler(OnEvent)) 

    static member GetHandler (element: UIElement) : RoutedEventHandler = 
     element.GetValue(HandlerProperty) :?> _ 

    static member SetHandler (element: UIElement, value : RoutedEventHandler) = 
     element.SetValue(HandlerProperty, value) 

wpfApp演示文件，可以发现here（FsXaml 2.1.0）