Popup.Opened 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 IsOpen 属性更改为 true 时发生。

public:
 event EventHandler ^ Opened;

public event EventHandler Opened;

member this.Opened : EventHandler

Public Custom Event Opened As EventHandler

以下示例演示如何为 Opened 事件定义事件处理程序。

private void PopupOpening(object sender, EventArgs e)
{
    //Code to execute when Popup opens
}

Private Sub PopupOpening(ByVal sender As Object, ByVal e As EventArgs)
    'Code to execute when Popup opens
End Sub

<DockPanel>
  <Popup Opened="PopupOpening">
    <TextBlock Background="Yellow">Popup Text</TextBlock>
  </Popup>
</DockPanel>

Popup通过切换 IsOpen 属性打开和关闭。