UpDownBase.OnMouseWheel(MouseEventArgs) 方法

定义

引发 MouseWheel 事件。Raises the MouseWheel event.

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

参数

e
MouseEventArgs

一个包含事件数据的 MouseEventArgsA MouseEventArgs that contains the event data.

注解

如果数字显示框(也称为 up-down 控件)在此事件发生时具有焦点,则确定用户滚动鼠标滚轮的方向,并调用 UpButtonDownButton 方法。If the spin box (also known as an up-down control) has focus when this event occurs, the direction the user scrolled the mouse wheel is determined, and either the UpButton or DownButton method is called.

引发事件时,将通过委托调用事件处理程序。Raising an event invokes the event handler through a delegate. 有关详细信息,请参阅处理和引发事件For more information, see Handling and Raising Events.

OnMouseWheel 方法还允许派生类对事件进行处理而不必附加委托。The OnMouseWheel method also allows derived classes to handle the event without attaching a delegate. 这是在派生类中处理事件的首选技术。This is the preferred technique for handling the event in a derived class.

继承者说明

在派生类中重写 OnMouseWheel(MouseEventArgs) 时,一定要调用基类的 OnMouseWheel(MouseEventArgs) 方法,以便已注册的委托对事件进行接收。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.

适用于

另请参阅