Control.OnMouseEnter(EventArgs) Control.OnMouseEnter(EventArgs) Control.OnMouseEnter(EventArgs) Control.OnMouseEnter(EventArgs) Method

定义

引发 MouseEnter 事件。Raises the MouseEnter event.

protected:
 virtual void OnMouseEnter(EventArgs ^ e);
protected virtual void OnMouseEnter (EventArgs e);
abstract member OnMouseEnter : EventArgs -> unit
override this.OnMouseEnter : EventArgs -> unit
Protected Overridable Sub OnMouseEnter (e As EventArgs)

参数

e
EventArgs EventArgs EventArgs EventArgs

包含事件数据的 EventArgsAn EventArgs 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.

OnMouseEnter 方法还允许派生类对事件进行处理而不必附加委托。The OnMouseEnter 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 OnMouseEnter(EventArgs) 时,一定要调用基类的 OnMouseEnter(EventArgs) 方法,以便已注册的委托对事件进行接收。When overriding OnMouseEnter(EventArgs) in a derived class, be sure to call the base class's OnMouseEnter(EventArgs) method so that registered delegates receive the event.

适用于

另请参阅