UploadFileCompletedEventHandler Délégué

Définition

Espace de noms:

System.Net

Assembly:

System.Net.WebClient.dll

Représente la méthode qui gérera l'événement UploadFileCompleted d'un WebClient.

public delegate void UploadFileCompletedEventHandler(System::Object ^ sender, UploadFileCompletedEventArgs ^ e);

public delegate void UploadFileCompletedEventHandler(object sender, UploadFileCompletedEventArgs e);

type UploadFileCompletedEventHandler = delegate of obj * UploadFileCompletedEventArgs -> unit

Public Delegate Sub UploadFileCompletedEventHandler(sender As Object, e As UploadFileCompletedEventArgs)

Paramètres

sender

Object

Source de l'événement.

e

UploadFileCompletedEventArgs

UploadFileCompletedEventArgs qui contient des données d’événement.

Exemples

L’exemple de code suivant illustre le chargement asynchrone d’un fichier.

// Sample call: UploadFileInBackground("http://www.contoso.com/fileUpload.aspx", "data.txt")
void UploadFileInBackground( String^ address, String^ fileName )
{
   System::Threading::AutoResetEvent^ waiter = gcnew System::Threading::AutoResetEvent( false );
   WebClient^ client = gcnew WebClient;
   Uri ^uri = gcnew Uri(address);
   String^ method = "POST";

   // Specify that that UploadFileCallback method gets called
   // when the file upload completes.
   client->UploadFileCompleted += gcnew UploadFileCompletedEventHandler( UploadFileCallback );
   client->UploadFileAsync( uri, method, fileName, waiter );

   // Block the main application thread. Real applications
   // can perform other tasks while waiting for the upload to complete.
   waiter->WaitOne();
   Console::WriteLine( "File upload is complete." );
}

// Sample call: UploadFileInBackground("http://www.contoso.com/fileUpload.aspx", "data.txt")
public static void UploadFileInBackground(string address, string fileName)
{
    System.Threading.AutoResetEvent waiter = new System.Threading.AutoResetEvent(false);
    WebClient client = new WebClient();
    Uri uri = new Uri(address);
    string method = "POST";

    // Specify that that UploadFileCallback method gets called
    // when the file upload completes.
    client.UploadFileCompleted += new UploadFileCompletedEventHandler(UploadFileCallback);
    client.UploadFileAsync(uri, method, fileName, waiter);

    // Block the main application thread. Real applications
    // can perform other tasks while waiting for the upload to complete.
    waiter.WaitOne();
    Console.WriteLine("File upload is complete.");
}

'  Sample call: UploadFileInBackground("http:' www.contoso.com/fileUpload.aspx", "data.txt")
Public Shared Sub UploadFileInBackground(ByVal address As String, ByVal fileName As String)

    Dim waiter As System.Threading.AutoResetEvent = New System.Threading.AutoResetEvent(False)
    Dim client As WebClient = New WebClient()
    Dim method As String = "POST"
                 Dim uri as Uri =  New Uri(address)

    '  Specify that that UploadFileCallback method gets called
    '  when the file upload completes.
    AddHandler client.UploadFileCompleted, AddressOf UploadFileCallback
    client.UploadFileAsync(uri, method, fileName, waiter)

    '  Block the main application thread. Real applications
    '  can perform other tasks while waiting for the upload to complete.
    waiter.WaitOne()
    Console.WriteLine("File upload is complete.")
End Sub

La méthode suivante est appelée lorsque le chargement est terminé.

void UploadFileCallback( Object^ /*sender*/, UploadFileCompletedEventArgs^ e )
{
   System::Threading::AutoResetEvent^ waiter = dynamic_cast<System::Threading::AutoResetEvent^>(e->UserState);
   ;
   try
   {
      String^ reply = System::Text::Encoding::UTF8->GetString( e->Result );
      Console::WriteLine( reply );
   }
   finally
   {

      // If this thread throws an exception, make sure that
      // you let the main application thread resume.
      waiter->Set();
   }

}

private static void UploadFileCallback(Object sender, UploadFileCompletedEventArgs e)
{
    System.Threading.AutoResetEvent waiter = (System.Threading.AutoResetEvent)e.UserState; ;
    try
    {
        string reply = System.Text.Encoding.UTF8.GetString(e.Result);

        Console.WriteLine(reply);
    }
    finally
    {
        // If this thread throws an exception, make sure that
        // you let the main application thread resume.
        waiter.Set();
    }
}

Private Shared Sub UploadFileCallback(ByVal sender As Object, ByVal e As System.Net.UploadFileCompletedEventArgs)

    Dim waiter As System.Threading.AutoResetEvent = CType(e.UserState, System.Threading.AutoResetEvent)
    Try

        Dim reply As String = System.Text.Encoding.UTF8.GetString(e.Result)
        Console.WriteLine(reply)
    Finally
        '  If this thread throws an exception, make sure that
        '  you let the main application thread resume.
        waiter.Set()
    End Try
End Sub

Remarques

Lorsque vous créez un délégué UploadFileCompletedEventHandler, vous identifiez la méthode qui gérera l'événement. Pour associer l'événement au gestionnaire d'événements, ajoutez une instance du délégué à l'événement. Le gestionnaire d'événements est appelé chaque fois qu'un événement se produit, sauf si vous supprimez le délégué. Pour plus d’informations sur les délégués de gestionnaires d’événements, consultez Gestion et déclenchement d’événements.

Méthodes d’extension

GetMethodInfo(Delegate)

Obtient un objet qui représente la méthode représentée par le délégué spécifié.