UploadDataCompletedEventHandler Delegado

Definición

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)

Parámetros

Ejemplos

En el ejemplo de código siguiente se muestra cómo cargar datos de forma asincrónica.

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

Se llama al método siguiente cuando se completa la carga.

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

Comentarios

Al crear un UploadDataCompletedEventHandler delegado, se identifica el método que controlará el evento. Para asociar el evento con el controlador de eventos, agregue una instancia del delegado al evento. Se llama al controlador de eventos cada vez que se produce el evento, a menos que quite el delegado. Para obtener más información sobre los delegados del controlador de eventos, consulte Control y generación de eventos.