ToolStripItem.VisibleChanged 事件

定義

發生於 Visible 屬性的值變更時。Occurs when the value of the Visible property changes.

public:
 event EventHandler ^ VisibleChanged;
public event EventHandler VisibleChanged;
member this.VisibleChanged : EventHandler 
Public Custom Event VisibleChanged As EventHandler 

範例

下列程式碼範例示範如何使用這個成員。The following code example demonstrates the use of this member. 在此範例中, 事件處理常式會報告VisibleChanged事件的發生次數。In the example, an event handler reports on the occurrence of the VisibleChanged event. 此報表可協助您瞭解事件發生的時間, 並可協助您進行調試。This report helps you to learn when the event occurs and can assist you in debugging. 若要報告多個事件或經常發生的事件, 請考慮MessageBox.ShowConsole.WriteLine取代為, 或將訊息附加TextBox至多行。To report on multiple events or on events that occur frequently, consider replacing MessageBox.Show with Console.WriteLine or appending the message to a multiline TextBox.

若要執行範例程式碼,請將它貼到包含繼承自ToolStripItem之類型實例的專案中,例如ToolStripButtonToolStripMenuItemTo run the example code, paste it into a project that contains an instance of a type that inherits from ToolStripItem, such as a ToolStripButton or ToolStripMenuItem. 然後為實例ToolStripItem1命名,並確定事件處理常式VisibleChanged與事件相關聯。Then name the instance ToolStripItem1 and ensure that the event handler is associated with the VisibleChanged event.

private void ToolStripItem1_VisibleChanged(Object sender, EventArgs e) {

   MessageBox.Show("You are in the ToolStripItem.VisibleChanged event.");

}
Private Sub ToolStripItem1_VisibleChanged(sender as Object, e as EventArgs) _ 
     Handles ToolStripItem1.VisibleChanged

   MessageBox.Show("You are in the ToolStripItem.VisibleChanged event.")

End Sub

備註

如需處理事件的詳細資訊, 請參閱處理和引發事件For more information about handling events, see Handling and Raising Events.

注意

變更的ToolStrip VisibleChanged屬性不會引發事件。 EnabledChanging the Enabled property of a ToolStrip does not raise the VisibleChanged event. 使用特定的屬性設定來引發此事件。Raise this event with specific property settings.

適用於