Question

usually when a class exposes an event :

SomeClass.OnSomeEvent += Handler ;

what i’m trying to understand : (correct me if i’m wrong )

when implementing INotifyPropertyChanged the implementing class exposes PropertyChanged event

(1)who registers to that event ?

(2) is there a way to observe the underlying code of the wpf framework ?

Answer 1

(1)who registers to that event ?

The Binding objects. They are helper objects, created implicitly when setting up a WPF databinding.

(2) is there a way to observe the underlying code of the wpf framework ?

You can always use Reflection. But reading the docs and specs will be easier.