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WebClient.OnDownloadStringCompleted(DownloadStringCompletedEventArgs) 方法

定義

引發 DownloadStringCompleted 事件。

protected:
 virtual void OnDownloadStringCompleted(System::Net::DownloadStringCompletedEventArgs ^ e);
protected virtual void OnDownloadStringCompleted (System.Net.DownloadStringCompletedEventArgs e);
abstract member OnDownloadStringCompleted : System.Net.DownloadStringCompletedEventArgs -> unit
override this.OnDownloadStringCompleted : System.Net.DownloadStringCompletedEventArgs -> unit
Protected Overridable Sub OnDownloadStringCompleted (e As DownloadStringCompletedEventArgs)

參數

範例

下列程式代碼範例示範這個方法的實作,這個方法可由衍生自 WebClient的類別自定義。

virtual void OnDownloadStringCompleted( DownloadStringCompletedEventArgs ^ e ) override
{
   // Here you can perform any custom actions before the event is raised
   // and event handlers are called...
   WebClient::OnDownloadStringCompleted( e );

   // Here you can perform any post event actions...
}
protected override void OnDownloadStringCompleted (DownloadStringCompletedEventArgs e)
{
    // Here you can perform any custom actions before the event is raised
    // and event handlers are called...

    base.OnDownloadStringCompleted (e);

    // Here you can perform any post event actions...
}

備註

謹慎

WebRequestHttpWebRequestServicePointWebClient 已經過時,您不應該將它們用於新的開發。 請改用 HttpClient

繼承自這個類別的類別可以覆寫此方法,以在發生 DownloadStringCompleted 事件時執行其他工作。

引發事件會透過委派叫用事件處理程式。 如需詳細資訊,請參閱 處理和引發事件

OnDownloadStringCompleted 方法也允許衍生類別處理事件,而不附加委派。 這是在衍生類別中處理事件的慣用技術。

給繼承者的注意事項

在衍生類別中覆寫 OnDownloadStringCompleted(DownloadStringCompletedEventArgs) 時,請務必呼叫基類的 OnDownloadStringCompleted(DownloadStringCompletedEventArgs) 方法,讓已註冊的委派接收事件。

適用於