What should MVVM Model be like?

Question

Hello i have 3 questions about MVVM Model.

1. Isn't there any way to bypass that redundant PropertyChanged("PropName");
2. What is the best way to wrap POCO objects to WPF INotifyPropertyChanged, IDataErrorInfo
3. How should i interact with (WPfWrapers - POCO) inside ViewModel - via casting, or property...

Thanks.

Answer 1

Here are 3 answers:

1. You find alternatives of raising the PropertyChanged event without passing the “PropName” as string parameter in the .NET community. However, all of them have other drawbacks (e.g. performance).

2. The best way is to implement INotifyPropertyChanged and IDataErrorInfo directly in the Model. That’s not always possible. If you need to wrap you Model classes then you might have a look at the DataModel concept.

3. I’m not sure if I understand the last question right but here is an answer. The ViewModel or DataModel should interact with the Model directly. But these classes shouldn’t interact with the View in a direct way. Use interfaces (e.g. IView) for such scenarios.

More information can be found here: WPF Application Framework (WAF)