ProgressChangedEventHandler Delegate


Represents the method that will handle the ProgressChanged event of the BackgroundWorker class. This class cannot be inherited.

public delegate void ProgressChangedEventHandler(System::Object ^ sender, ProgressChangedEventArgs ^ e);
public delegate void ProgressChangedEventHandler(object sender, ProgressChangedEventArgs e);
public delegate void ProgressChangedEventHandler(object? sender, ProgressChangedEventArgs e);
type ProgressChangedEventHandler = delegate of obj * ProgressChangedEventArgs -> unit
Public Delegate Sub ProgressChangedEventHandler(sender As Object, e As ProgressChangedEventArgs)



The source of the event.


A ProgressChangedEventArgs that contains the event data.


The following code example shows how to use the ProgressChangedEventHandler class. This example is part of a larger example for the BackgroundWorker class.

// This event handler updates the progress bar.
void backgroundWorker1_ProgressChanged( Object^ /*sender*/, ProgressChangedEventArgs^ e )
   this->progressBar1->Value = e->ProgressPercentage;
// This event handler updates the progress bar.
private void backgroundWorker1_ProgressChanged(object sender,
    ProgressChangedEventArgs e)
    this.progressBar1.Value = e.ProgressPercentage;
' This event handler updates the progress bar.
Private Sub backgroundWorker1_ProgressChanged( _
ByVal sender As Object, ByVal e As ProgressChangedEventArgs) _
Handles backgroundWorker1.ProgressChanged

    Me.progressBar1.Value = e.ProgressPercentage

End Sub


When you create a ProgressChangedEventHandler delegate, you identify a method to handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see Handling and Raising Events.

Extension Methods


Gets an object that represents the method represented by the specified delegate.

Applies to