You never pass a view model to a service. A service doesn't even know about the existence of a view model that you might have defined in your GUI (ASP. NET MVC) tier.
A service works with domain models. Personally I use AutoMapper to map between view models and models and vice versa, so this logic goes into the mapping layer.
– LukLed Feb 19 at 20:36 @LukLed, the service layer exposes business operations that you could do with the model. Those business operations could be reused among many different applications: ASP. NET MVC, WinForms, WPF, exposed as WCF services, ... View models are just temporary objects to answer a specific needs of a given view.
They are just a representation of the real model. View models are not something that a service layer should bother with. They are too specific to the given application.
– Darin Dimitrov Feb 19 at 20:38 @Darin Dimitrov: My question is, what does it do here? Can you give an example of communication between controller and service in this specific situation, when we are creating user? – LukLed Feb 19 at 20:41 @LukLed, here's an example: a controller action receives a view model from a view, it uses a mapping layer (AutoMapper in my case) to map this view model to a model and then invokes a service method passing it this model.
So the important thing to note here is that the controller communicates with the view only through view models: it receives view models to the view and it passes view models to the view. That's how I do it. – Darin Dimitrov Feb 19 at 20:42 2 @eldar, I think both approaches good.
And by the way for me EF models should not be considered as models (unless you use Code First approach) => those are just autogenerated by assistant database transport objects that should go into a CRUD repository and not a service because they are often polluted/related with the specific data access technology you are using (EF in this case). – Darin Dimitrov Feb 19 at 20:51.
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