算法：输出某个数组所有组合

           var arry3 = new string[] { "116.403191", "2", "39.91296", "0001" };
            string res = "";
            for (int i = 0; i < 4; i++)
            {
                for (int j = 0; j < 4; j++)
                {
                    if (j == 3)
                    {
                        continue;
                    }

                    //交换位置
                    string temp = arry3[j + 1];
                    arry3[j + 1] = arry3[j];
                    arry3[j] = temp;

                    string md5 = "";
                    for (int k = 0; k < 4; k++)
                    {
                        md5 += arry3[k];
                    }

                    res += DL_helper.funcGetMD5(md5) + "<br />";
                }
            }

            Response.Write(res);