using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

​

public static class Iterator

{

   public static IEnumerable<object[]> Enumerate(params IEnumerable[] enumerables)

   {

     var list = new List<object>();

     var enumerators = new List<IEnumerator>();

     bool end = false;

     foreach(var enu in enumerables)

     {

       enumerators.Add(enu.GetEnumerator());

     }

     while(!end)

     {

       list.Clear();

       foreach(var enu in enumerators)

       {

           if(!enu.MoveNext()) { end = true; break; }

           list.Add(enu.Current);                  

       }

       if(!end) yield return list.ToArray();           

     }

   }

}

public class Program

{

    public static void Main()

    {

        var listA = new[] { 1, 2, 3 };

        var listB = new[] { "a", "b", "c" };

        var listC = new[] { 5f, 6f, 7f };

        foreach(var n in Iterator.Enumerate(listA, listB, listC))

        {

            foreach(var obj in n)

            {

                Console.Write(obj.ToString() + ", ");

            }

            Console.WriteLine();

        }

    }

}