WebClient.DownloadDataCompleted Ereignis

Definition

Tritt ein, wenn ein asynchroner Datendownload abgeschlossen wird.Occurs when an asynchronous data download operation completes.

public:
 event System::Net::DownloadDataCompletedEventHandler ^ DownloadDataCompleted;
public event System.Net.DownloadDataCompletedEventHandler DownloadDataCompleted;
member this.DownloadDataCompleted : System.Net.DownloadDataCompletedEventHandler 
Public Event DownloadDataCompleted As DownloadDataCompletedEventHandler 

Beispiele

Im folgenden Codebeispiel wird das Festlegen eines Ereignis Handlers für dieses Ereignis veranschaulicht.The following code example demonstrates setting an event handler for this event.

// Sample call : DownLoadDataInBackground ("http://www.contoso.com/GameScores.html");
void DownloadDataInBackground( String^ address )
{
   System::Threading::AutoResetEvent^ waiter = gcnew System::Threading::AutoResetEvent( false );
   WebClient^ client = gcnew WebClient;
   Uri ^uri = gcnew Uri(address);
   
   // Specify that the DownloadDataCallback method gets called
   // when the download completes.
   client->DownloadDataCompleted += gcnew DownloadDataCompletedEventHandler( DownloadDataCallback );
   client->DownloadDataAsync( uri, waiter );
   
   // Block the main application thread. Real applications
   // can perform other tasks while waiting for the download to complete.
   waiter->WaitOne();
}


// Sample call : DownLoadDataInBackground ("http://www.contoso.com/GameScores.html");
public static void DownloadDataInBackground (string address)
{
    System.Threading.AutoResetEvent waiter = new System.Threading.AutoResetEvent (false);
    WebClient client = new WebClient ();
    Uri uri = new Uri(address);

    // Specify that the DownloadDataCallback method gets called
    // when the download completes.
    client.DownloadDataCompleted += new DownloadDataCompletedEventHandler (DownloadDataCallback);
    client.DownloadDataAsync (uri, waiter);

    // Block the main application thread. Real applications
    // can perform other tasks while waiting for the download to complete.
    waiter.WaitOne ();
}

'  Sample call : DownLoadDataInBackground ("http:' www.contoso.com/GameScores.html")
Public Shared Sub DownloadDataInBackground(ByVal address As String)

    Dim waiter As System.Threading.AutoResetEvent = New System.Threading.AutoResetEvent(False)
    Dim client As WebClient = New WebClient()

    '  Specify that the DownloadDataCallback method gets called
    '  when the download completes.
    AddHandler client.DownloadDataCompleted, AddressOf DownloadDataCallback
                Dim uri as Uri = New Uri(address)
    client.DownloadDataAsync(uri, waiter)

    '  Block the main application thread. Real applications
    '  can perform other tasks while waiting for the download to complete.
    waiter.WaitOne()
End Sub

Hinweise

Dieses Ereignis wird jedes Mal ausgelöst, wenn ein asynchroner Daten Downloadvorgang abgeschlossen ist.This event is raised each time an asynchronous data download operation completes. Asynchrone Daten Downloads werden gestartet, indem die DownloadDataAsync-Methoden aufgerufen werden.Asynchronous data downloads are started by calling the DownloadDataAsync methods.

Der DownloadDataCompletedEventHandler ist der Delegat für dieses Ereignis.The DownloadDataCompletedEventHandler is the delegate for this event. Die DownloadDataCompletedEventArgs-Klasse stellt dem Ereignishandler Ereignisdaten bereit.The DownloadDataCompletedEventArgs class provides the event handler with event data.

Weitere Informationen zum Behandeln von Ereignissen finden Sie unter behandeln und Auslösen von Ereignissen.For more information about how to handle events, see Handling and Raising Events.

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