DateTimePicker.OnValueChanged(EventArgs) 方法

定义

引发 ValueChanged 事件。Raises the ValueChanged event.

protected:
 virtual void OnValueChanged(EventArgs ^ eventargs);
protected virtual void OnValueChanged (EventArgs eventargs);
abstract member OnValueChanged : EventArgs -> unit
override this.OnValueChanged : EventArgs -> unit

参数

eventargs
EventArgs

包含事件数据的 EventArgsAn EventArgs that contains the event data.

注解

当控件的值更改时发生 ValueChanged 事件。The ValueChanged event occurs when the value for the control changes.

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.

OnValueChanged 方法还允许派生类对事件进行处理而不必附加委托。The OnValueChanged 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 OnValueChanged(EventArgs) 时,请确保调用基类的 "OnValueChanged(EventArgs) 方法,以便注册的委托接收事件。When overriding OnValueChanged(EventArgs) in a derived class, be sure to call the base class' OnValueChanged(EventArgs) method so that registered delegates receive the event.

适用于

另请参阅