Page.OnPreInit(EventArgs) Page.OnPreInit(EventArgs) Page.OnPreInit(EventArgs) Page.OnPreInit(EventArgs) Method

定義

在頁面初始化的開始處引發 PreInit 事件。Raises the PreInit event at the beginning of page initialization.

protected:
 virtual void OnPreInit(EventArgs ^ e);
protected virtual void OnPreInit (EventArgs e);
abstract member OnPreInit : EventArgs -> unit
override this.OnPreInit : EventArgs -> unit
Protected Overridable Sub OnPreInit (e As EventArgs)

參數

e
EventArgs EventArgs EventArgs EventArgs

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

備註

OnPreInit在頁面初始化階段開頭呼叫方法。The OnPreInit method is called at the beginning of the page initialization stage.

之後OnPreInit方法呼叫、 個人化資訊載入和初始化頁面的佈景主題,如果有的話。After the OnPreInit method is called, personalization information is loaded and the page theme, if any, is initialized. 這也是慣用的階段以動態方式定義PageThemeMasterPage頁面。This is also the preferred stage to dynamically define a PageTheme or MasterPage for the Page.

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.

OnPreInit 方法也允許衍生類別處理事件,而不用附加委派。The OnPreInit 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 OnPreInit(EventArgs) 時,請確定呼叫基底類別的 OnPreInit(EventArgs) 方法,使已註冊的委派能接收到事件。When overriding OnPreInit(EventArgs) in a derived class, be sure to call the base class's OnPreInit(EventArgs) method so that registered delegates receive the event.

適用於