PropertyChanged.Fody and PropertyObserver

Question

Both Fody's PropertyChanged and Josh Smith's PropertyObserver are two great packages/patterns to use in WPF development. However, they don't seem to be able to be used together.

At compile time, it seems that the class that I'm trying to observe needs to explicitly implement INotifyPropertyChanged (instead of just adding the Fody ImplementPropertyChanged tag on the class).

The type 'MyViewModel' cannot be used as type parameter 'TPropertySource' in the generic type or method 'PropertyObserver'. There is no implicit reference conversion from 'MyViewModel' to 'System.ComponentModel.INotifyPropertyChanged'

Am I missing something? Does someone have a clever solution?

Answer 1

As the Fody.PropertyChanged documentation states:

All classes that do not have [ImplementPropertyChanged] but still have INotifyPropertyChanged will have notification code injected into property sets.

So manually implement INotifyPropertyChanged on your class (no choice here, since PropertyObserver is expecting a type implementing this interface), and you'll still have the the calls to PropertyChanged injected in your properties by Fody.