Simple Dependency Resolver

Question

How do you create simple Dependency Resolver, with out using any built in or library such as Autofac, Ninject, etc.

This was my interview question.

I wrote t

Answer 1

It's already a few years old, but Ayende once wrote a blog post about this:
Building an IoC container in 15 lines of code

But this is only the very simplest possible implementation.
Ayende himself stated in his next post that the existing IoC containers can do much more stuff than just returning class instances - and this is where it gets complicated.
As "Trust me - I'm a Doctor" already said in his comment: implementing a complete IoC container is everything but trivial.