MainMenu.OnCollapse(EventArgs) 方法
定义
protected public:
virtual void OnCollapse(EventArgs ^ e);
protected internal virtual void OnCollapse (EventArgs e);
abstract member OnCollapse : EventArgs -> unit
override this.OnCollapse : EventArgs -> unit
Protected Friend Overridable Sub OnCollapse (e As EventArgs)
参数
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.
OnCollapse 方法还允许派生类对事件进行处理而不必附加委托。The OnCollapse 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 OnCollapse(EventArgs) 在派生类中重写时,请确保调用基类的 OnCollapse(EventArgs) 方法,以便注册的委托接收事件。When overriding OnCollapse(EventArgs) in a derived class, be sure to call the base class' OnCollapse(EventArgs) method so that registered delegates receive the event.