Why does the model binder need an empty constructor

Question

I need some help with some fundamentals here...

I have this controller that serves up my view with an instance of a class (at least that\'s how I think it works). So

Answer 1

There is no direct connection between model you pass to view and model that you receive in request. In ultimate case the code for initial request and response will run in different instance of IIS or even different machines.

So when request come back ASP.Net MVC need to recreate all objects (controller, model,...). Having default constructor allows run-time to create new object without knowledge of particular arguments to your custom constructor.

Side note: Similar reconstruction for constructor exist for generics where you can only specify where T:new() for default constructor.