using System;

public class Program

{

    public static void Main()

    {

    test t = new test(1);

    Console.WriteLine(t.foo(sum, 1));

​

    Func<int,int, int> pippo =sum;

    test t1 = new test(1);

    Console.WriteLine(t1.foo(pippo, 1));

    test t2 = new test(1);

        Console.WriteLine(t2.foo( (int a,int b) =>{ return a+b; }, 1));

    }

    public static int sum(int a, int b){

    return a+b;

    }

}

​

interface Itest<T> where T: struct

{

​

     T abc();

​

​

}

​

public class test : Itest<test>

​

{

​

    private int _age;

    private int _name;

    public int Name

    {

        get {

          return _name;

        }

        set{

        _name = value;

        }

    }

    public test(int age){

        this._age = age;

    }

    public int  foo(Func<int,int, int> callBack, int a)

    {

        return callBack(a,a);

    }

    public T abc()

    {

        return (T) new object() ;

    }

​

}