RunWorkerCompletedEventHandler RunWorkerCompletedEventHandler RunWorkerCompletedEventHandler RunWorkerCompletedEventHandler Delegate

Definición

Representa el método que controlará el evento RunWorkerCompleted de una clase BackgroundWorker. Represents the method that will handle the RunWorkerCompleted event of a BackgroundWorker class.

public delegate void RunWorkerCompletedEventHandler(System::Object ^ sender, RunWorkerCompletedEventArgs ^ e);
public delegate void RunWorkerCompletedEventHandler(object sender, RunWorkerCompletedEventArgs e);
type RunWorkerCompletedEventHandler = delegate of obj * RunWorkerCompletedEventArgs -> unit
Public Delegate Sub RunWorkerCompletedEventHandler(sender As Object, e As RunWorkerCompletedEventArgs)
Parámetros
sender
Object Object Object Object

Origen del evento. The source of the event.

Herencia
RunWorkerCompletedEventHandlerRunWorkerCompletedEventHandlerRunWorkerCompletedEventHandlerRunWorkerCompletedEventHandler

Ejemplos

En el ejemplo de código siguiente se muestra un método que puede usarse como un controlador para RunWorkerCompletedEventHandler.The following code example shows a method that can be used as a handler for RunWorkerCompletedEventHandler. Este ejemplo forma parte de un ejemplo mayor para el BackgroundWorker clase.This example is part of a larger sample for the BackgroundWorker class.

// This event handler deals with the results of the
// background operation.
void backgroundWorker1_RunWorkerCompleted( Object^ /*sender*/, RunWorkerCompletedEventArgs^ e )
{
   // First, handle the case where an exception was thrown.
   if ( e->Error != nullptr )
   {
      MessageBox::Show( e->Error->Message );
   }
   else
   if ( e->Cancelled )
   {
      // Next, handle the case where the user cancelled 
      // the operation.
      // Note that due to a race condition in 
      // the DoWork event handler, the Cancelled
      // flag may not have been set, even though
      // CancelAsync was called.
      resultLabel->Text = "Cancelled";
   }
   else
   {
      // Finally, handle the case where the operation 
      // succeeded.
      resultLabel->Text = e->Result->ToString();
   }

   // Enable the UpDown control.
   this->numericUpDown1->Enabled = true;

   // Enable the Start button.
   startAsyncButton->Enabled = true;

   // Disable the Cancel button.
   cancelAsyncButton->Enabled = false;
}
// This event handler deals with the results of the
// background operation.
private void backgroundWorker1_RunWorkerCompleted(
    object sender, RunWorkerCompletedEventArgs e)
{
    // First, handle the case where an exception was thrown.
    if (e.Error != null)
    {
        MessageBox.Show(e.Error.Message);
    }
    else if (e.Cancelled)
    {
        // Next, handle the case where the user canceled 
        // the operation.
        // Note that due to a race condition in 
        // the DoWork event handler, the Cancelled
        // flag may not have been set, even though
        // CancelAsync was called.
        resultLabel.Text = "Canceled";
    }
    else
    {
        // Finally, handle the case where the operation 
        // succeeded.
        resultLabel.Text = e.Result.ToString();
    }

    // Enable the UpDown control.
    this.numericUpDown1.Enabled = true;

    // Enable the Start button.
    startAsyncButton.Enabled = true;

    // Disable the Cancel button.
    cancelAsyncButton.Enabled = false;
}
' This event handler deals with the results of the
' background operation.
Private Sub backgroundWorker1_RunWorkerCompleted( _
ByVal sender As Object, ByVal e As RunWorkerCompletedEventArgs) _
Handles backgroundWorker1.RunWorkerCompleted

    ' First, handle the case where an exception was thrown.
    If (e.Error IsNot Nothing) Then
        MessageBox.Show(e.Error.Message)
    ElseIf e.Cancelled Then
        ' Next, handle the case where the user canceled the 
        ' operation.
        ' Note that due to a race condition in 
        ' the DoWork event handler, the Cancelled
        ' flag may not have been set, even though
        ' CancelAsync was called.
        resultLabel.Text = "Canceled"
    Else
        ' Finally, handle the case where the operation succeeded.
        resultLabel.Text = e.Result.ToString()
    End If

    ' Enable the UpDown control.
    Me.numericUpDown1.Enabled = True

    ' Enable the Start button.
    startAsyncButton.Enabled = True

    ' Disable the Cancel button.
    cancelAsyncButton.Enabled = False
End Sub 'backgroundWorker1_RunWorkerCompleted

Comentarios

Cuando creas un RunWorkerCompletedEventHandler delegado, identifica un método para controlar el evento.When you create a RunWorkerCompletedEventHandler delegate, you identify a method to handle the event. Para asociar el evento al controlador, se debe agregar una instancia del delegado al evento.To associate the event with your event handler, add an instance of the delegate to the event. Siempre que se produce el evento, se llama a su controlador, a menos que se quite el delegado.The event handler is called whenever the event occurs, unless you remove the delegate. Para obtener más información sobre los delegados de controlador de eventos, consulte controlar y provocar eventos.For more information about event handler delegates, see Handling and Raising Events.

Se aplica a