在WPF自定义附加事件 [英] Custom attached events in WPF

问题描述

我可能是错在这里得到的术语，但我认为我试图创建一个附加事件。

I might be getting the terminology wrong here, but I think I'm trying to create an attached event.

在表面SDK，你可以做这样的事情

In the Surface SDK, you can do things like:

<Grid Background="{StaticResource WindowBackground}" x:Name="Foo" s:SurfaceFrameworkElement.ContactChanged="Foo_ContactChanged"/>

我要创建哪些处理程序可以在XAML中以同样的方式被添加自定义事件，但我有麻烦了。

I want to create a custom event for which a handler can be added in XAML in the same way, but I'm having trouble.

我可以创建自定义路由事件，但XAML IntelliSense不看到它和事件处理程序不加，如果我只是定期输入。这里是我的事件定义：

I can create a custom routed event, but the XAML intellisense doesn't see it and the event handler isn't added if I just type it in regularly. Here is my event definition:

public static class TagRectEvents
{
    public static readonly RoutedEvent TagRectEnterEvent = EventManager.RegisterRoutedEvent(
        "TagRectEnter", RoutingStrategy.Bubble, typeof( RoutedEventHandler ), typeof( TagRectEvents ) );

    public static void AddTagRectEnterHandler( DependencyObject d, RoutedEventHandler handler )
    {
        UIElement element = d as UIElement;
        if ( element == null )
        {
            return;
        }
        element.AddHandler( TagRectEvents.TagRectEnterEvent, handler );
    }

    public static void RemoveTagRectEnterHandler( DependencyObject d, RoutedEventHandler handler )
    {
        UIElement element = d as UIElement;
        if ( element == null )
        {
            return;
        }
        element.RemoveHandler( TagRectEvents.TagRectEnterEvent, handler );
    }
}

我是不是要去了解这一切错了吗？所有的附加行为的例子我看到的是更多的元素添加附加属性，然后做的事情，设置该属性。

Am I just going about it all wrong? All of the "attached behavior" examples I see are more about adding an attached property, and then doing things with elements that set that property.

推荐答案

您必须或者不能映射命名空间，和/或附加事件如地方：TagRectEvents.TagRectEnterEvent 。你必须使用 TagRectEnter ，而不是 TagRectEnterEvent 。

You must either be not mapping the namespace, and/or attaching event like local:TagRectEvents.TagRectEnterEvent . You have to use TagRectEnter, and not TagRectEnterEvent.

命名空间映射：

 xmlns:local="clr-namespace:WpfInfrastructure.WpfAttachedEvents"

用法：

<Button Content="Press" local:TagRectEvents.TagRectEnter="MyHandler" Margin="25,43,36,161" />

处理器：

Handler :

    public void MyHandler(object sender, RoutedEventArgs e)
    {
        System.Diagnostics.Debug.WriteLine("Hurray!");
    }

我用你的代码，它工作正常这里。

I used your code, it works correctly here.

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