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 dialo

Answer 1

You could also, in your ViewModel copy the model's state to internal fields, and then expose these and then only set them on the model, when the user actually commits the change.

Problem could be, that on-the-fly validation will be more troublesome if validation relies on the entity being updated - if this is a requirement you could create a clone of the model to work on and then merging the clone with the actual entity when it is saved.