DoWorkEventArgs Klas

Definitie

public ref class DoWorkEventArgs : EventArgs

public ref class DoWorkEventArgs : System::ComponentModel::CancelEventArgs

public class DoWorkEventArgs : EventArgs

public class DoWorkEventArgs : System.ComponentModel.CancelEventArgs

type DoWorkEventArgs = class
    inherit EventArgs

type DoWorkEventArgs = class
    inherit CancelEventArgs

Public Class DoWorkEventArgs
Inherits EventArgs

Public Class DoWorkEventArgs
Inherits CancelEventArgs

Overname

Object

EventArgs

DoWorkEventArgs

Overname

Object

EventArgs

CancelEventArgs

DoWorkEventArgs

Voorbeelden

In het volgende codevoorbeeld ziet u hoe u de DoWorkEventArgs klasse gebruikt om de DoWork gebeurtenis af te handelen. Zie Procedure voor een volledige codevermelding : Een bewerking uitvoeren op de achtergrond.

void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    // Do not access the form's BackgroundWorker reference directly.
    // Instead, use the reference provided by the sender parameter.
    BackgroundWorker bw = sender as BackgroundWorker;

    // Extract the argument.
    int arg = (int)e.Argument;

    // Start the time-consuming operation.
    e.Result = TimeConsumingOperation(bw, arg);

    // If the operation was canceled by the user, 
    // set the DoWorkEventArgs.Cancel property to true.
    if (bw.CancellationPending)
    {
        e.Cancel = true;
    }
}

Private Sub backgroundWorker1_DoWork( _
sender As Object, e As DoWorkEventArgs) _
Handles backgroundWorker1.DoWork

   ' Do not access the form's BackgroundWorker reference directly.
   ' Instead, use the reference provided by the sender parameter.
   Dim bw As BackgroundWorker = CType( sender, BackgroundWorker )
   
   ' Extract the argument.
   Dim arg As Integer = Fix(e.Argument)
   
   ' Start the time-consuming operation.
   e.Result = TimeConsumingOperation(bw, arg)
   
   ' If the operation was canceled by the user, 
   ' set the DoWorkEventArgs.Cancel property to true.
   If bw.CancellationPending Then
      e.Cancel = True
   End If

End Sub

Zie ook

• BackgroundWorker
• Handleiding: Een bewerking uitvoeren op de achtergrond