DoWorkEventArgs.Argument Property
Definition
Important
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Gets a value that represents the argument of an asynchronous operation.
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
Property Value
An Object representing the argument of an asynchronous operation.
Examples
The following code example demonstrates how to use the DoWorkEventArgs class to handle the DoWork event. 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
Applies to
See also
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