NumericUpDown.OnKeyDown(KeyEventArgs) 方法

定义

引发 KeyDown 事件。Raises the KeyDown event.

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

参数

e
KeyEventArgs

包含事件数据的 KeyEventArgsA KeyEventArgs that contains the event data.

注解

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.

OnKeyDown 方法还允许派生类对事件进行处理而不必附加委托。The OnKeyDown 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

当在派生类中重写 OnKeyDown(KeyEventArgs) 时,请确保调用基类的 "OnKeyDown(KeyEventArgs) 方法,以便注册的委托接收事件。When overriding OnKeyDown(KeyEventArgs) in a derived class, be sure to call the base class' OnKeyDown(KeyEventArgs) method so that registered delegates receive the event.

适用于