Popup.Opened 事件

定義

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

當 IsOpen 屬性變更為 true 時發生。

public:
 event EventHandler ^ Opened;

public event EventHandler Opened;

member this.Opened : EventHandler

Public Custom Event Opened As EventHandler

下列範例示範如何定義事件的事件處理常式 Opened 。

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>

開啟 Popup 並關閉，方法是切換 IsOpen 屬性。