WPF EventTriggers-在Visual Studio 2008中无法将属性'RoutedEvent'中的字符串'DragOver'转换为类型'System.Windows.RoutedEvent'的对象

Question

我为WPF按钮实现了一些触发器，如下所示：

   <ControlTemplate.Triggers>
        <EventTrigger RoutedEvent="DragOver">
            <BeginStoryboard Storyboard="{StaticResource swap}"/>
            <BeginStoryboard Storyboard="{StaticResource fadein}"/>
        </EventTrigger>

        <EventTrigger RoutedEvent="DragLeave">
            <BeginStoryboard Storyboard="{StaticResource reset}"/>
            <BeginStoryboard Storyboard="{StaticResource fadeout}"/>
        </EventTrigger>

        <EventTrigger RoutedEvent="Drop">
            <BeginStoryboard Storyboard="{StaticResource reset}"/>
            <BeginStoryboard Storyboard="{StaticResource fadeout}"/>
        </EventTrigger>
    </ControlTemplate.Triggers>

这在Visual Studio 2015中可以正常工作，但是在Visual Studio 2008中，它会抛出以下错误：

Cannot convert string 'DragOver' in attribute 'RoutedEvent' to object of type 'System.Windows.RoutedEvent'

我已将事件触发器中的上述路由事件更改为：

• RoutedEvent =“ DragOver”-> RoutedEvent =“ Mouse.DragOver”
• RoutedEvent =“ DragLeave”-> RoutedEvent =“ Mouse.DragLeave”
• RoutedEvent =“ Drop”-> RoutedEvent =“ Mouse.Drop”

xaml解析器无法识别Mouse.DragOver，Mouse.DragLeave，Mouse.Drop，突出显示。 有任何想法吗？

Answer 1

我找到了解决方案。 我需要在Button事件之前加上路由事件，如下所示。 现在正在工作：

   <ControlTemplate.Triggers>
        <EventTrigger RoutedEvent="Button.DragOver">
            <BeginStoryboard Storyboard="{StaticResource swap}"/>
            <BeginStoryboard Storyboard="{StaticResource fadein}"/>
        </EventTrigger>

        <EventTrigger RoutedEvent="Button.DragLeave">
            <BeginStoryboard Storyboard="{StaticResource reset}"/>
            <BeginStoryboard Storyboard="{StaticResource fadeout}"/>
        </EventTrigger>

        <EventTrigger RoutedEvent="Button.Drop">
            <BeginStoryboard Storyboard="{StaticResource reset}"/>
            <BeginStoryboard Storyboard="{StaticResource fadeout}"/>
        </EventTrigger>
    </ControlTemplate.Triggers>