DoWorkEventArgs Класс

Определение

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

Наследование

Object

EventArgs

DoWorkEventArgs

Наследование

Object

EventArgs

CancelEventArgs

DoWorkEventArgs

Примеры

В следующем примере кода показано, как использовать DoWorkEventArgs класс для решения DoWork события.The following code example demonstrates how to use the DoWorkEventArgs class to handle the DoWork event. Полный листинг кода см. в разделе как выполнить операцию в фоновом режиме.For a full code listing, see How to: Run an Operation in the Background.

private 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   

Конструкторы

Свойства

Методы

Применяется к

См. также раздел

• BackgroundWorker
• Практическое руководство. Фоновое выполнение операцииHow to: Run an Operation in the Background