TextBox.OnGotFocus(EventArgs) 方法

定義

引發 GotFocus 事件。Raises the GotFocus event.

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

參數

e
EventArgs

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

備註

當使用者選取控制項中的文字時 TextBox ,控制項會儲存選取專案。When the user selects text in a TextBox control, the control saves the selection. TextBox 控制項取得焦點時,選取範圍會和失去焦點時相同 TextBoxWhen a TextBox control gets focus, the selection is the same as when the TextBox loses focus. TextBox 第一次取得焦點時,會選取整個文字。When the TextBox gets focus for the first time, the entire text is selected.

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.

OnGotFocus 方法也允許衍生類別處理事件,而不用附加委派。The OnGotFocus 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

OnGotFocus(EventArgs)在衍生類別中覆寫時,請務必呼叫基類的方法, OnGotFocus(EventArgs) 以便註冊的委派會接收事件。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.

適用於