UploadDataCompletedEventHandler Delegat

Definition

Namespace:

System.Net

Assembly:

System.Net.WebClient.dll

Stellt die Methode zur Behandlung des UploadDataCompleted-Ereignisses eines WebClient-Objekts dar.

public delegate void UploadDataCompletedEventHandler(System::Object ^ sender, UploadDataCompletedEventArgs ^ e);

public delegate void UploadDataCompletedEventHandler(object sender, UploadDataCompletedEventArgs e);

type UploadDataCompletedEventHandler = delegate of obj * UploadDataCompletedEventArgs -> unit

Public Delegate Sub UploadDataCompletedEventHandler(sender As Object, e As UploadDataCompletedEventArgs)

Parameter

sender

Object

Die Quelle des Ereignisses.

e

UploadDataCompletedEventArgs

Ein UploadDataCompletedEventArgs, das Ereignisdaten enthält.

Beispiele

Im folgenden Codebeispiel wird das asynchrone Hochladen von Daten veranschaulicht.

void UploadDataInBackground2( String^ address )
{
   WebClient^ client = gcnew WebClient;
   Uri ^uri = gcnew Uri(address);
   String^ text = "Time = 12:00am temperature = 50";
   array<Byte>^data = System::Text::Encoding::UTF8->GetBytes( text );
   String^ method = "POST";

   client->UploadDataCompleted += gcnew UploadDataCompletedEventHandler( UploadDataCallback2 );
   client->UploadDataAsync( uri, method, data );
}

public static void UploadDataInBackground2(string address)
{
    WebClient client = new WebClient();
    Uri uri = new Uri(address);
    string text = "Time = 12:00am temperature = 50";
    byte[] data = System.Text.Encoding.UTF8.GetBytes(text);
    string method = "POST";

    client.UploadDataCompleted += new UploadDataCompletedEventHandler(UploadDataCallback2);
    client.UploadDataAsync(uri, method, data);
}

Public Shared Sub UploadDataInBackground2(ByVal address As String)

    Dim client As WebClient = New WebClient()
    Dim text As String = "Time = 12:00am temperature = 50"
    Dim data() As Byte = System.Text.Encoding.UTF8.GetBytes(text)
    Dim method As String = "POST"

    AddHandler client.UploadDataCompleted, AddressOf UploadDataCallback2
    Dim uri as Uri = New Uri(address)
                client.UploadDataAsync(uri, method, data)
End Sub

Die folgende Methode wird aufgerufen, wenn der Upload abgeschlossen ist.

void UploadDataCallback2( Object^ /*sender*/, UploadDataCompletedEventArgs^ e )
{
   array<Byte>^data = dynamic_cast<array<Byte>^>(e->Result);
   String^ reply = System::Text::Encoding::UTF8->GetString( data );
   Console::WriteLine( reply );
}

private static void UploadDataCallback2(Object sender, UploadDataCompletedEventArgs e)
{
    byte[] data = (byte[])e.Result;
    string reply = System.Text.Encoding.UTF8.GetString(data);

    Console.WriteLine(reply);
}

Private Shared Sub UploadDataCallback2(ByVal sender As Object, ByVal e As UploadDataCompletedEventArgs)

    Dim data() As Byte = CType(e.Result, Byte())
    Dim reply As String = System.Text.Encoding.UTF8.GetString(data)

    Console.WriteLine(reply)
End Sub

Hinweise

Beim Erstellen eines UploadDataCompletedEventHandler-Delegaten bestimmen Sie die Methode für die Ereignisbehandlung. Um dem Ereignishandler das Ereignis zuzuordnen, fügen Sie dem Ereignis eine Instanz des Delegaten hinzu. Der Ereignishandler wird bei jedem Eintreten des Ereignisses aufgerufen, sofern der Delegat nicht entfernt wird. Weitere Informationen zu Ereignishandlerdelegierten finden Sie unter Behandeln und Auslösen von Ereignissen.

Erweiterungsmethoden

GetMethodInfo(Delegate)

Ruft ein Objekt ab, das die Methode darstellt, die vom angegebenen Delegaten dargestellt wird.