Raises the ProgressChanged event.
Assemblies: System.ComponentModel.EventBasedAsync (in System.ComponentModel.EventBasedAsync.dll)
System (in System.dll)
Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.
The method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.Notes to Inheritors
When overriding in a derived class, be sure to call the base class's method so that registered delegates receive the event.
The following code example demonstrates the use of the method to report the progress of an asynchronous operation. This code example is part of a larger example provided for the AsyncOperationManager class.
' This method is invoked via the AsyncOperation object, ' so it is guaranteed to be executed on the correct thread. Private Sub CalculateCompleted(ByVal operationState As Object) Dim e As CalculatePrimeCompletedEventArgs = operationState OnCalculatePrimeCompleted(e) End Sub ' This method is invoked via the AsyncOperation object, ' so it is guaranteed to be executed on the correct thread. Private Sub ReportProgress(ByVal state As Object) Dim e As ProgressChangedEventArgs = state OnProgressChanged(e) End Sub Protected Sub OnCalculatePrimeCompleted( _ ByVal e As CalculatePrimeCompletedEventArgs) RaiseEvent CalculatePrimeCompleted(Me, e) End Sub Protected Sub OnProgressChanged( _ ByVal e As ProgressChangedEventArgs) RaiseEvent ProgressChanged(e) End Sub