ToolStripItem.OnClick(EventArgs) 方法

定義

引發 Click 事件。Raises the Click event.

protected:
 virtual void OnClick(EventArgs ^ e);
protected virtual void OnClick (EventArgs e);
abstract member OnClick : EventArgs -> unit
override this.OnClick : EventArgs -> unit
Protected Overridable Sub OnClick (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 OnClick 方法。The following code example demonstrates how to override the OnClick method. 這個程式碼範例是針對類別提供之較大範例的一部分 ToolStripItemThis code example is part of a larger example provided for the ToolStripItem class.

// The method defines the behavior of the Click event.
// It simply toggles the state of the clickedValue field.
protected override void OnClick(EventArgs e)
{
    base.OnClick(e);

    this.clickedValue ^= true;
}
' The method defines the behavior of the Click event.
' It simply toggles the state of the clickedValue field.
Protected Overrides Sub OnClick(e As EventArgs)
   MyBase.OnClick(e)
   
     Me.clickedValue = Me.clickedValue Xor True
 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.

OnClick 方法也允許衍生類別處理事件,而不用附加委派。The OnClick 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 OnClick(EventArgs) 時,請確定呼叫基底類別的 OnClick(EventArgs) 方法,使已註冊的委派能接收到事件。When overriding OnClick(EventArgs) in a derived class, be sure to call the base class's OnClick(EventArgs) method so that registered delegates receive the event.

適用於