Windows® Phone 8 Unleashed

Implementing INotifyPropertyChanged: An Alternative Approach

Although there is nothing manifestly wrong with adding the OnPropertyChanged method to every class that implements INotifyPropertyChanged (apart from violating the DRY principle), it makes sense to extract the change notification code into a reusable class, because this allows you to not only reduce boilerplate code but also to add other features to the event-raising code, such as improving support for multithreaded apps and implementing INotifyPropertyChanging (as well as INotifyPropertyChanged).

The WPUnleashed project in the downloadable sample code includes such a class, named PropertyChangeNotifier. The ViewModelBase class delegates change notification to a PropertyChangeNotifier ...