using System;

public interface IFoo { }

​

public interface IFooWrapper<I> where I : IFoo { }

​

public class Foo : IFoo { }

public class FooWrapper : IFooWrapper<Foo> { }

​

class Tester 

{

    void Test()

    {

        Register(new FooWrapper());

    }

    void Register<T>(IFooWrapper<T> foo) where T: IFoo

    {

    }

}

​