事件冒泡在WPF应用程序 [英] Event Bubbling in WPF Application

问题描述

我是新来的WPF。在我的WPF应用程序，我的Windows包含一个用户定义的子控件​​和用户定义的子控件​​又包含另外一个用户定义的子控件​​。现在从最内侧的子控件，在点击一个按钮，我想火在所有三个控件（即第一个大孩子的控制，第二个孩子的控制，第三个主要的控制和窗口）。事件

I'm new to WPF. In my WPF app, I have Windows which contain a user defined child control and that user defined child control again contains another user defined child control. Now from the inner most child control, on a button click, I want to fire events on all three controls (i.e. First Grand Child Control, Second Child Control, Third Main Control, and Window).

我知道这可以通过委托和事件冒泡来实现。你能告诉我怎么样？

I know this can be achieved through delegates and Event Bubbling. Can you please tell me how?

推荐答案

最重要的一块PF code为： 添加事件处理程序的静态UIElement.MouseLeftButtonUpEvent：

Most important piece pf code for that: Add the event handlers on the static UIElement.MouseLeftButtonUpEvent:

middleInnerControl.AddHandler(UIElement.MouseLeftButtonUpEvent , new RoutedEventHandler(handleInner)); //adds the handler for a click event on the most out 
mostOuterControl.AddHandler(UIElement.MouseLeftButtonUpEvent , new RoutedEventHandler(handleMostOuter)); //adds the handler for a click event on the most out 

该事件处理：

The EventHandlers:

private void handleInner(object asd, RoutedEventArgs e)
    {
        InnerControl c = e.OriginalSource as InnerControl;
        if (c != null)
        {
            //do whatever
        }
        e.Handled = false; // do not set handle to true --> bubbles further
    }

private void handleMostOuter(object asd, RoutedEventArgs e)
    {
        InnerControl c = e.OriginalSource as InnerControl;
        if (c != null)
        {
            //do whatever
        }
        e.Handled = true; // set handled = true, it wont bubble further
    }

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