WPF 中的自定义附加事件

发布于 2024-07-26 09:12:53 字数 1288 浏览 3 评论 0原文

我可能在这里用错了术语,但我想我正在尝试创建一个附加事件。

在 Surface SDK 中,您可以执行以下操作:

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

我想创建一个自定义事件,可以以相同的方式在 XAML 中添加处理程序,但我遇到了麻烦。

我可以创建自定义路由事件,但 XAML 智能感知看不到它,并且如果我只是定期键入它,则不会添加事件处理程序。 这是我的事件定义:

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 );
    }
}

我是不是搞错了? 我看到的所有“附加行为”示例更多的是关于添加附加属性,然后使用设置该属性的元素执行操作。

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

In the Surface SDK, you can do things like:

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

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.

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 );
    }
}

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.

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评论(2

你列表最软的妹 2024-08-02 09:12:53

您必须不映射命名空间,和/或附加诸如 local:TagRectEvents.TagRectEnterEvent 之类的事件。 您必须使用 TagRectEnter,而不是 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" />

处理程序:

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

我使用了你的代码,它在这里工作正常。

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

Namespace mapping :

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

Usage :

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

Handler :

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

I used your code, it works correctly here.

反目相谮 2024-08-02 09:12:53

为了使附加事件显示在 Intellisense 中,它必须位于驻留在卫星程序集(或 .dll 库)中的类中。 添加库的最简单方法是将“WPF 自定义控件库”项目添加到您的解决方案中。 使用 Wpf 控件库只是确保自动添加所有典型引用(使用 C# 类库则不会)。只要在 Themes/Generic 中删除其关联的 Style,就可以删除 CustomControl1.cs。 xaml。

In order to get the attached event to show up in Intellisense, it has to be in a class that resides in a satellite assembly -- or .dll library. The easiest way to add a library is add a "WPF Custom Control Library" project to your solution. Using a Wpf control library just ensures that all the typical References will be added automatically (which they won't with a C# class library.) You can delete the CustomControl1.cs just as long as you delete its associated Style in Themes/Generic.xaml.

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