Control.OnMouseWheel(MouseEventArgs) 方法

定義

命名空間:
System.Windows.Forms
組件:
System.Windows.Forms.dll

引發 MouseWheel 事件。Raises the MouseWheel event.

protected:
 virtual void OnMouseWheel(System::Windows::Forms::MouseEventArgs ^ e);
protected virtual void OnMouseWheel (System.Windows.Forms.MouseEventArgs e);
abstract member OnMouseWheel : System.Windows.Forms.MouseEventArgs -> unit
override this.OnMouseWheel : System.Windows.Forms.MouseEventArgs -> unit
Protected Overridable Sub OnMouseWheel (e As MouseEventArgs)

參數

e
MouseEventArgs

MouseEventArgs，其中包含事件資料。A MouseEventArgs that contains the event data.

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.

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

適用於

另請參閱