c# - Silverlight 自定义 EventTrigger

Question

我正在尝试创建一个自定义事件来触发 Silverlight 中的动画。虽然事件被触发，但动画不起作用。以下是相关代码：

namespace SilverlightApplication1
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            MyEvent += new ChangedEventHandler(UserControl_MyEventHandler);
            /* Other stuff */
        }
        private void UserControl_MyEventHandler(object sender, RoutedEventArgs e)
        {
                MessageBox.Show("MyEventHandler has been called");
        }

        public delegate void ChangedEventHandler(object sender, RoutedEventArgs e);

        private event ChangedEventHandler MyEvent;

        private void UserControl_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
                if (MyEvent != null)
                    MyEvent(this, e);
        }
    }
}

XAML 代码如下：

<UserControl
... 
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" mc:Ignorable="d"
x:Class="SilverlightApplication1.MainPage" MouseLeftButtonDown="UserControl_MouseLeftButtonDown">

    <Grid x:Name="LayoutRoot" Background="White">
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="MyEvent">
                <ei:GoToStateAction StateName="Highlighted"/>
            </i:EventTrigger>
        </i:Interaction.Triggers>
        ...
    </Grid>
</UserControl>

当前，正在显示包含“MouseLeftButtonDown”的消息框，但未调用动画。当 EventTrigger EventNameMouseLeftButtonDown不是 时，动画确实被调用了MyEvent。请帮帮我。谢谢。

Answer 1

如果要触发某个控件的事件，可以在 EventTrigger 中设置 SourceName。我想，在你的情况下，在后面的代码中：

VisualStateManager.GoToState(this [or some other object with Highlighted state], "Highlighted", false);