/// <summary>        /// 生成salt        /// </summary>        /// <returns></returns>        public static string GenerateSalt()        {            byte[] data = http://www.mamicode.com/new byte[0x10];>

        public static string[] ShortUrl(string url)        {            //可以自定义生成MD5加密字符传前的混合KEY                 string key = "anech";            //要使用生成URL的字符                 string[] chars = new string[]{            "a" , "b" , "c" , "d" , "e" , "f" , "g" , "h" ,            "i" , "j" , "k" , "l" , "m" , "n" , "o" , "p" ,            "q" , "r" , "s" , "t" , "u" , "v" , "w" , "x" ,             "y" , "z" , "0" , "1" , "2" , "3" , "4" , "5" ,             "6" , "7" , "8" , "9" , "A" , "B" , "C" , "D" ,             "E" , "F" , "G" , "H" , "I" , "J" , "K" , "L" ,             "M" , "N" , "O" , "P" , "Q" , "R" , "S" , "T" ,             "U" , "V" , "W" , "X" , "Y" , "Z"          };            //对传入网址进行MD5加密                 string hex = MD5(key + url);            string[] resUrl = new string[4];            for (int i = 0; i < 4; i++)            {                //把加密字符按照8位一组16进制与0x3FFFFFFF进行位与运算                     int hexint = 0x3FFFFFFF & Convert.ToInt32("0x" + hex.Substring(i * 8, 8), 16);                string outChars = string.Empty;                for (int j = 0; j < 6; j++)                {                    //把得到的值与0x0000003D进行位与运算，取得字符数组chars索引                         int index = 0x0000003D & hexint;                    //把取得的字符相加                         outChars += chars[index];                    //每次循环按位右移5位                         hexint = hexint >> 5;                }                //把字符串存入对应索引的输出数组                     resUrl[i] = outChars;            }            return resUrl;        }        public static string MD5(String input)        {            byte[] res = new MD5CryptoServiceProvider().ComputeHash(Encoding.Default.GetBytes(input));            return BitConverter.ToString(res).Replace("-", "");        }