Is this a view model?

I'm still new to MVVM and am trying to understand the concepts.

I have a class generated by Linq To Sql for a table.

I want this class to look different, so I create a new class with some of the properties from the gener开发者_开发问答ated class and a few new properties, that is only dependent on generated class.

Is this class a model, a view model or something different?

ViewModel represents the state and behavior of the View. I would call a class a ViewModel if:

• It provides property change notification through INotifyPropertyChanged
• Has commands for the view
• Provies a model for the view, by specializing the model for easier data binding (formatting etc)

Could be a View Model, but not necessarily. Are these extra properties there for the purpose of supporting a view. If yes, then you could argue that it's a view model class.

View Models exist because views exist. Models exist because you have a domain of data. the View Model greases the skids between reality (model) and a given users perception of that reality (the view)