Does unity just make clasess with out needing anything registered?

Question

I am watching Mike Tautly\'s awesome intro to Prism. It was all making sense, but I got a bit confused in the sixth video.

He has his view class\'s constructor take a p

Answer 1

Unity tries to construct the class injecting resolved dependencies in the biggest constructor (with the maximum number of parameter).

So, if you have such a view model:

public class ViewModel
{
    public ViewModel(IMyDependency dependency) { .. }
    ...
}

you only need to register IMyDependency.

Answer 2

When a type can be instantiated (i.e. not a base class nor an interface) unity can figure out how that type is created without the need of registering a type mapping.

Mappings are useful when the type to be injected is not instantiatable on its own.

I hope this helps.

Thanks, Damian