// Wrap event invocations inside a protected virtual method
protected virtual void OnProgressUpdateEventHandler(ProgressUpdateEventArgs e)
{
// Make a temporary copy of the event to avoid possibility of
// a race condition if the last subscriber unsubscribes
// immediately after the null check and before the event is raised.
ProgressUpdateEventHandler?.Invoke(this, e);
}
public void RegisterNotifier(ProgressUpdateEventHandler handler)
{
notifier.ProgressUpdate += handler;
}
