Ninject MVC 3 - Injecting dependencies into models and controllers

I don't fully understand what's happening behind the scenes when we inject dependencies into controllers and models.

I have the following controller:

    public class TypeController : CommonController
    {
        private ILookUpService lookUpService;

        public TypeController(ILookUpService lookUpService)
        {
            this.lookUpService = lookUpService;    
        }   

    }

As the application starts, the lookup service is already available. So I guess that somewhere behind scenes we have code on the lines of

TypeController controller = new TypeController(service);

or something to do with factory (which I need to read up about).

When it comes to injecting a service开发者_运维技巧 into a view model, it doesn't work as I need to invoke an empty constructor without passing interface to my service.

So what is happening behind the scenes? How do I inject a service into a view model? I guess I'm missing some real fundamental stuff which is stopping me from doing what I need.

I have included FactoryPattern in the tags as my gut feeling tell me it has something to do with my problem..

Thank you

You shouldn't inject anything into the view model. The view model should be a simple data container which is filled from the controller and therefore shouldn't have any dependencies.