/// <summary>

        /// 替换变量

        /// </summary>

        /// <param name="content"></param>

        /// <returns></returns>

        public static string replaceBianLiang(string content)

        {

            content = content.Replace("{当前时间}", DateTime.Now.TimeOfDay.ToString());

            string[] bianliang = new string[] { "{随机字母}", "{随机数字}", "{随机汉字}" };

            Regex r;

            int count;

            string readstr = "";

            foreach (string str in bianliang)

            {

                count = (content.Length - content.Replace(str, "").Length) / str.Length;

                if (str == "{随机汉字}") readstr = RandChina(count);

                if (str == "{随机数字}") readstr = GenerateCheckCodeNum(count);

                if (str == "{随机字母}") readstr = GenerateRandomLetter(count);

                if (count > readstr.Length) count = readstr.Length;

                r = new Regex(str.Replace("{", "\\{").Replace("}", "\\}"));

                for (int i = ; i < count; i++)

                {

                    content = r.Replace(content, readstr.Substring(i, ), );

                }

            }

            return content;

        }

        /// <summary>

        /// 随机生成字母

        /// </summary>

        /// <param name="Length"></param>

        /// <returns></returns>

        public static string GenerateRandomLetter(int Length)

        {

            char[] Pattern = new char[] { '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', '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' };

            string result = "";

            int n = Pattern.Length;

            Random random = new Random(~unchecked((int)DateTime.Now.Ticks));

            for (int i = ; i < Length; i++)

            {

                int rnd = random.Next(, n);

                result += Pattern[rnd];

            }

            return result;

        }

        /// <summary>

        /// 随机生成数字

        /// </summary>

        /// <param name="codeCount"></param>

        /// <returns></returns>

        public static string GenerateCheckCodeNum(int codeCount)

        {

            int rep = ;

            string str = string.Empty;

            long num2 = DateTime.Now.Ticks + rep;

            rep++;

            Random random = new Random(((int)(((ulong)num2) & 0xffffffffL)) | ((int)(num2 >> rep)));

            for (int i = ; i < codeCount; i++)

            {

                int num = random.Next();

                str = str + ((char)(0x30 + ((ushort)(num % )))).ToString();

            }

            return str;

        }

        /// <summary>

        /// 此函数为生成指定数目的汉字

        /// </summary>

        /// <param name="charLen">汉字数目</param>

        /// <returns>所有汉字</returns>

        public static string RandChina(int charLen)

        {

            int area, code;//汉字由区位和码位组成(都为0-94,其中区位16-55为一级汉字区,56-87为二级汉字区,1-9为特殊字符区)

            StringBuilder strtem = new StringBuilder();

            Random rand = new Random();

            for (int i = ; i < charLen; i++)

            {

                area = rand.Next(, );

                if (area == )//第55区只有89个字符

                {

                    code = rand.Next(, );

                }

                else

                {

                    code = rand.Next(, );

                }

                strtem.Append(Encoding.GetEncoding("GB2312").GetString(new byte[] { Convert.ToByte(area + ), Convert.ToByte(code + ) }));

            }

            return strtem.ToString();

        }