多个集合做笛卡尔积

多个集合做笛卡尔积，原文：http://bbs.csdn.net/topics/390853448

        List RecursionLINQ(List list, int startCount, List result)
        {
            if (startCount < list.Count)
            {
                result = result.Count == 0 ?
                    (from b in list[startCount] select b).ToList() :
                    (from a in result from b in list[startCount] select a + b).ToList();

                result = RecursionLINQ(list, startCount + 1, result);
            }

            return result;
        }


            string[] strs1 = { "S1", "S2", "S3" };
            string[] strs2 = { "B2" };
            string[] strs3 = { "C1", "C2" };
            List list = new List();

            list.Add(strs1);
            list.Add(strs2);
            list.Add(strs3);

            List result = new List();

           result = RecursionLINQ(list, 0, result);