WPF EventTriggers -在Visual 2008中不能将属性'RoutedEvent‘中的字符串'DragOver’转换为'System.Windows.RoutedEvent‘类型的对象。

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 2015中运行得很好，但是在Visual 2008中，它会抛出在错误下面：

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

我已将事件触发器中的以上路由事件更改为：

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

Mouse.DragOver、Mouse.DragLeave、Mouse.Drop不被xaml解析器识别，是高亮显示的。有什么想法吗？

Answer 1

我已经找到了解决办法。我需要使用Button和下面这样的句点对路由事件进行预处理。现在正在发挥作用：

   <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>