DoWorkEventArgs.Argument Egenskap

public:
 property System::Object ^ Argument { System::Object ^ get(); };

public object Argument { get; }

public object? Argument { get; }

member this.Argument : obj

Public ReadOnly Property Argument As Object

Egenskapsvärde

Ett Object som representerar argumentet för en asynkron åtgärd.

Exempel

Följande kodexempel visar hur du DoWorkEventArgs använder klassen för att hantera DoWork händelsen. En fullständig kodlista finns i Så här kör du en åtgärd i bakgrunden.

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

Se även

• BackgroundWorker
• Så här kör du en operation i bakgrunden