ToolStripItem.OnDoubleClick(EventArgs) 方法

定義

引發 DoubleClick 事件。Raises the DoubleClick event.

protected:
 virtual void OnDoubleClick(EventArgs ^ e);
protected virtual void OnDoubleClick (EventArgs e);
abstract member OnDoubleClick : EventArgs -> unit
override this.OnDoubleClick : EventArgs -> unit
Protected Overridable Sub OnDoubleClick (e As EventArgs)

參數

e
EventArgs

包含事件資料的 EventArgsAn EventArgs that contains the event data.

範例

下列程式碼範例示範如何覆寫 OnDoubleClick 方法。The following code example demonstrates how to override the OnDoubleClick method. 這個程式碼範例是針對 ToolStripItem 類別所提供的較大範例的一部分。This code example is part of a larger example provided for the ToolStripItem class.

// The method defines the behavior of the DoubleClick 
// event. It shows a MessageBox with the item's text.
protected override void OnDoubleClick(EventArgs e)
{
    base.OnDoubleClick(e);

    string msg = String.Format("Item: {0}", this.Text);

    MessageBox.Show(msg);
}
' The method defines the behavior of the DoubleClick 
' event. It shows a MessageBox with the item's text.
Protected Overrides Sub OnDoubleClick(e As EventArgs)
   MyBase.OnDoubleClick(e)
   
   Dim msg As String = String.Format("Item: {0}", Me.Text)
   
   MessageBox.Show(msg)
 End Sub

備註

引發事件會透過委派叫用此事件處理常式。Raising an event invokes the event handler through a delegate. 如需詳細資訊,請參閱處理和引發事件For more information, see Handling and Raising Events.

OnDoubleClick 方法也允許衍生類別處理事件,而不用附加委派。The OnDoubleClick method also allows derived classes to handle the event without attaching a delegate. 這是在衍生類別中處理事件的慣用技巧。This is the preferred technique for handling the event in a derived class.

給繼承者的注意事項

當在衍生類別中覆寫 OnDoubleClick(EventArgs) 時,請確定呼叫基底類別的 OnDoubleClick(EventArgs) 方法,使已註冊的委派能接收到事件。When overriding OnDoubleClick(EventArgs) in a derived class, be sure to call the base class's OnDoubleClick(EventArgs) method so that registered delegates receive the event.

適用於