ToolStripDropDown.OnVisibleChanged(EventArgs) ToolStripDropDown.OnVisibleChanged(EventArgs) ToolStripDropDown.OnVisibleChanged(EventArgs) ToolStripDropDown.OnVisibleChanged(EventArgs) Method

定义

引发 VisibleChanged 事件。Raises the VisibleChanged event.

protected:
 override void OnVisibleChanged(EventArgs ^ e);
protected override void OnVisibleChanged (EventArgs e);
override this.OnVisibleChanged : EventArgs -> unit
Protected Overrides Sub OnVisibleChanged (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.

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

适用于