Extension members need interface support (INotifyPropertyChanged)

[AwsomeCode]

Current implementation of extension members is good for backend code. But I am front-end developer. It would be game changing for front-end developer if you can put interface support.

We won't be creating separate view models.
Because we need to coping data from Model -> ViewModel and after changes we need to copy data from ViewModel => Model again
By creating extension View Models it solves this step.

I would like to know what other front-end developer thinks and XAML team as well.
Thank you.

[huoyaoyuan]

#9320

It's a long standing feature in the wish list. It's beneficial for many more areas, but just too complex and requires runtime support.