DateTimePicker.OnValueChanged(EventArgs) DateTimePicker.OnValueChanged(EventArgs) DateTimePicker.OnValueChanged(EventArgs) Method

定義

引發 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

參數

eventargs
EventArgs EventArgs EventArgs

包含事件資料的 EventArgsAn EventArgs that contains the event data.

備註

ValueChanged控制項的值變更時, 就會發生此事件。The ValueChanged event occurs when the value for the control changes.

引發事件會透過委派叫用此事件處理常式。Raising an event invokes the event handler through a delegate. 如需詳細資訊, 請參閱處理和引發事件For more information, see Handling and Raising Events.

OnValueChanged 方法也允許衍生類別處理事件,而不用附加委派。The OnValueChanged method also allows derived classes to handle the event without attaching a delegate. 這是在衍生類別中處理事件的慣用技巧。This is the preferred technique for handling the event in a derived class.

給繼承者的注意事項

在衍生OnValueChanged(EventArgs)類別中覆寫時, 請務必呼叫基類OnValueChanged(EventArgs)的方法, 讓已註冊的委派能接收事件。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.

適用於

另請參閱