Artikel
11/18/2011

BackgroundWorker.ReportProgress Method (Int32)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Namespace: System.ComponentModel
Assembly: System (in System.dll)

Syntax

'Declaration
Public Sub ReportProgress ( _
    percentProgress As Integer _
)

public void ReportProgress(
    int percentProgress
)

Parameters

percentProgress
Type: System.Int32
The percentage, from 0 to 100, of the background operation that is completed.

Exceptions

Exception	Condition
InvalidOperationException	The WorkerReportsProgress property is set to false.

Remarks

If you need the background operation to report on its progress, you can call the ReportProgress method to raise the ProgressChanged event. The WorkerReportsProgress property value must be true, or ReportProgress will throw an InvalidOperationException.

It is up to you to implement a meaningful way of measuring your background operation's progress as a percentage of the total task completed.

Examples

The following code example demonstrates the use of the ReportProgress method to report the progress of a background operation to the user. To view the complete code for this sample, see How to: Use a Background Worker.

Private Sub bw_DoWork(ByVal sender As Object, ByVal e As DoWorkEventArgs)
    Dim worker As BackgroundWorker = CType(sender, BackgroundWorker)

    For i = 1 To 10
        If bw.CancellationPending = True Then
            e.Cancel = True
            Exit For
        Else
            ' Perform a time consuming operation and report progress.
            System.Threading.Thread.Sleep(500)
            bw.ReportProgress(i * 10)
        End If
    Next
End Sub

private void bw_DoWork(object sender, DoWorkEventArgs e)
{
    BackgroundWorker worker = sender as BackgroundWorker;

    for (int i = 1; (i <= 10); i++)
    {
        if ((worker.CancellationPending == true))
        {
            e.Cancel = true;
            break;
        }
        else
        {
            // Perform a time consuming operation and report progress.
            System.Threading.Thread.Sleep(500);
            worker.ReportProgress((i * 10));
        }
    }
}

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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