FormView.OnItemUpdating(FormViewUpdateEventArgs) 方法

定義

引發 ItemUpdating 事件。Raises the ItemUpdating event.

protected:
 virtual void OnItemUpdating(System::Web::UI::WebControls::FormViewUpdateEventArgs ^ e);
protected virtual void OnItemUpdating (System.Web.UI.WebControls.FormViewUpdateEventArgs e);
abstract member OnItemUpdating : System.Web.UI.WebControls.FormViewUpdateEventArgs -> unit
override this.OnItemUpdating : System.Web.UI.WebControls.FormViewUpdateEventArgs -> unit
Protected Overridable Sub OnItemUpdating (e As FormViewUpdateEventArgs)

參數

e
FormViewUpdateEventArgs

FormViewUpdateEventArgs,其中包含事件資料。A FormViewUpdateEventArgs that contains the event data.

例外狀況

這個方法是在 FormView 控制項未繫結至資料來源控制項、使用者未取消更新作業,以及事件未註冊事件處理常式時呼叫。This method is called when the FormView control is not bound to a data source control, the user did not cancel the update operation, and an event handler is not registered for the event.

備註

OnItemUpdating控制項會呼叫方法 FormView 來引發 ItemUpdating 事件。The OnItemUpdating method is called by the FormView control to raise the ItemUpdating event. 它通常是由控制項開發人員在擴充類別時使用 FormViewIt is generally used by control developers when extending the FormView class.

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.

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

當在衍生類別中覆寫 OnItemUpdating(FormViewUpdateEventArgs) 時,請確定呼叫基底類別的 OnItemUpdating(FormViewUpdateEventArgs) 方法,使已註冊的委派能接收到事件。When overriding OnItemUpdating(FormViewUpdateEventArgs) in a derived class, be sure to call the base class's OnItemUpdating(FormViewUpdateEventArgs) method so that registered delegates receive the event.

適用於

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