TextBox.OnGotFocus(EventArgs) 方法


引发 GotFocus 事件。Raises the GotFocus event.

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



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


当用户在 TextBox 控件中选择文本时,控件将保存选定内容。When the user selects text in a TextBox control, the control saves the selection. TextBox 控件获得焦点时,所选内容与 TextBox 失去焦点时相同。When a TextBox control gets focus, the selection is the same as when the TextBox loses focus. TextBox 首次获得焦点时,将选择整个文本。When the TextBox gets focus for the first time, the entire text is selected.

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.

OnGotFocus 方法还允许派生类对事件进行处理而不必附加委托。The OnGotFocus 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.


当在派生类中重写 OnGotFocus(EventArgs) 时,请确保调用基类的 "OnGotFocus(EventArgs) 方法,以便注册的委托接收事件。When overriding OnGotFocus(EventArgs) in a derived class, be sure to call the base class' OnGotFocus(EventArgs) method so that registered delegates receive the event.