HierarchicalDataSourceControl.OnDataSourceChanged(EventArgs) 方法

定義

引發 DataSourceChanged 事件。Raises the DataSourceChanged event.

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

參數

e
EventArgs

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

備註

OnDataSourceChanged方法會通知資料繫結控制項,表示基礎資料來源或記憶體中快取的資料已經變更、控制項應重新系結,以及應執行任何必要的工作。The OnDataSourceChanged method notifies a data-bound control that the underlying data source or the data cached in memory has changed, that the control should rebind, and that any necessary work should be performed.

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.

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

適用於

另請參閱