wpf - What goes in Model in MVVM?

Question

The things which are supposed to go into the Model are also allowed to go into the View-Model i.e. Public Properties, IDataErroInfo and INotifyPropertyChanged, then what should actually go into the model?

Answer 1

Model

Business Data + Business Logic + Business Rules

View

Application UI

ViewModel

Wrapper Over Model which is easily readable/bindable by View using minimum Effort/Code.

1. IDataErrorInfo - Should go into ViewModel
2. INotifyPropertyChanged - Should go into ViewModel. Could also go in the Model if necessary (But not recommended)
3. Public Properties - Yes of course a Model should have them.