ToolStripItem.EnabledChanged 事件

定義

發生於 Enabled 屬性值變更時。Occurs when the Enabled property value has changed.

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

事件類型

EventHandler

範例

下列程式碼範例將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事件的發生情況 EnabledChangedIn the example, an event handler reports on the occurrence of the EnabledChanged event. 這份報告可協助您瞭解發生事件的時間,並協助您進行調試。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,請考慮將取代為 MessageBox.Show Console.WriteLine 或將訊息附加至多行 TextBoxTo 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,請將它貼到專案中,其中包含繼承自之類型的實例 ToolStripItem ,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. 然後命名實例 ToolStripItem1 ,並確定事件處理常式與事件相關聯 EnabledChangedThen name the instance ToolStripItem1 and ensure that the event handler is associated with the EnabledChanged event.

private void ToolStripItem1_EnabledChanged(Object sender, EventArgs e) {

   MessageBox.Show("You are in the ToolStripItem.EnabledChanged event.");
}
Private Sub ToolStripItem1_EnabledChanged(sender as Object, e as EventArgs) _ 
     Handles ToolStripItem1.EnabledChanged

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

End Sub

備註

如果透過 Enabled 程式設計的修改或使用者互動來變更屬性,就會引發此事件。This event is raised if the Enabled property is changed by either a programmatic modification or user interaction.

注意

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

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.

適用於