wpf - How to cancel an edit to an object using MVVM?

Question

How can I implement cancelation of editing an object using MVVM.

For example: I have a list of customers. I choose one customer an click the button "Edit", a dialog window(DataContext is binded to CustomerViewModel) opens and I start editing customer's fields. And then I decide to cancel editing, but the fields of the customer have been already changed, so how can I return a customer to its previous state in MVVM?

Answer 1

Check out the IEditableObject interface. Your Customer class should implement that, and your commands can execute BeginEdit / CancelEdit / EndEdit as appropriate.