/// 从字符串转换到16进制表示的字符串

        /// 编码,如"utf-8","gb2312"

        /// 是否每字符用逗号分隔

        public static string ToHex(string s, string charset, bool fenge)

        {

            if ((s.Length % 2) != 0)

            {

                s += " ";//空格

                //throw new ArgumentException("s is not valid chinese string!");

            }

            System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);

            byte[] bytes = chs.GetBytes(s);

            string str = "";

            for (int i = 0; i < bytes.Length; i++)

            {

                str += string.Format("{0:X}", bytes[i]);

                if (fenge && (i != bytes.Length - 1))

                {

                    str += string.Format("{0}", ",");

                }

            }

            return str.ToLower();

        }

        /// 从16进制转换成utf编码的字符串

        /// 编码,如"utf-8","gb2312"

        public static string UnHex(string hex, string charset)

        {

            if (hex == null)

                throw new ArgumentNullException("hex");

            hex = hex.Replace(",", "");

            hex = hex.Replace("\n", "");

            hex = hex.Replace("\\", "");

            hex = hex.Replace(" ", "");

            if (hex.Length % 2 != 0)

            {

                hex += "20";//空格

                throw new ArgumentException("hex is not a valid number!", "hex");

            }

            // 需要将 hex 转换成 byte 数组。

            byte[] bytes = new byte[hex.Length / 2];

            for (int i = 0; i < bytes.Length; i++)

            {

                try

                {

                    // 每两个字符是一个 byte。

                    bytes[i] = byte.Parse(hex.Substring(i * 2, 2),

                    System.Globalization.NumberStyles.HexNumber);

                }

                catch

                {

                    // Rethrow an exception with custom message.

                    throw new ArgumentException("hex is not a valid hex number!", "hex");

                }

            }

            System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);

            return chs.GetString(bytes);

        }