Expander.Expanded 事件

定义

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

当控件的内容窗口 Expander 打开以显示其标头和内容时发生。

public:
 event System::Windows::RoutedEventHandler ^ Expanded;

public event System.Windows.RoutedEventHandler Expanded;

member this.Expanded : System.Windows.RoutedEventHandler

Public Custom Event Expanded As RoutedEventHandler

以下示例演示如何指定事件的 Expanded 事件处理程序。

yourExpander.Expanded += new RoutedEventHandler(expanderHasExpanded);

AddHandler yourExpander.Expanded, AddressOf expanderHasExpanded

<Expander Name ="yourExpander" Expanded="expanderHasExpanded" 
          Header ="expanderTitle" Content="expanderContent"/>

以下示例演示如何定义事件处理程序。

private void expanderHasExpanded(object sender, RoutedEventArgs args)
{
    //Do something when the Expander control expands
}

Private Sub expanderHasExpanded(ByVal sender As Object, ByVal args As RoutedEventArgs)
    'Do something when the Expander control expands
End Sub

当Expanded属性从false更改为 true. 时IsExpanded发生该事件。

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