Check if class being used?

Question

Simple problem, is it possible to check if a class is being used or not?

class A { }
class B { }

class TestClass
{
    static void Main(string[] args)
    {
        var a = new A();
    }
}

I want to loop through all classes with reflection and get back that A is being used somewhere. By "used" I mean there is a reference to it somewhere, it does not need to be loaded necessarily already. In the same way Visual Studio show how many references an object has.

Answer 1

Short answer: My understanding is that unfortunately it is not possible to see if a class is used or not using reflection. I've got this hardcore solution tip using the Expression feature but I'm not sure that it is what I'm after.