using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

interface ITestInterface {

    IStringer GetStringer();

}

​

interface IStringer{}

​

class Foo :IStringer{}

​

class Bar : ITestInterface {

    public Foo GetStringer() {

        return new Foo();

    }

}