using System;

public class Program

{

    public static void Main()

    {

        var x = new MyClass<Bar>();

        FooDelegate test = x.Foo;

        test("Do It");

    }

    public delegate IBar FooDelegate(string str);

    public interface IBar { }

    public class Bar : IBar { }

    public class MyClass<T> where T : IBar, new()

    {

        T item;

        public T Foo(string input) { Console.WriteLine(input); return item; }

    }

}