using System;

using System.Collections.Generic;

​

public delegate T MeDelegate<T>();

​

public class Program

{

    public static void Main(){

        TestGetAllReturnValue();

    }

    public static void TestGetAllReturnValue()

    {

        MeDelegate<int> dele = ReturnFive;

        dele += Return10;

        dele += Return22;

        foreach (int n in GetAllReturnValue(dele)){

            Console.WriteLine(n);

        }

    }

    public static void TestGetAllReturnValueWithFunc()

    {

        Func<int> dele = ReturnFive;

        dele += Return10;

        dele += Return22;

        foreach (int n in GetAllReturnValue(dele)){

            Console.WriteLine(n);

        }

    }

​

    static IEnumerable<Targ> GetAllReturnValue<Targ>(Func<Targ> d){

        foreach(MeDelegate<Targ> del in d.GetInvocationList())

            yield return del();

    }

​

    static IEnumerable<Targ> GetAllReturnValue<Targ>(MeDelegate<Targ> d){

        foreach(MeDelegate<Targ> del in d.GetInvocationList())

            yield return del();

    }

    static int ReturnFive(){return 5;}

    static int Return10(){return 10;}

    static int Return22(){return 22;}

}