private string StringToHexString(string s,Encoding encode)

        {

            byte[] b = encode.GetBytes(s);//按照指定编码将string编程字节数组

            string result = string.Empty;

            for (int i = ; i < b.Length; i++)//逐字节变为16进制字符，以%隔开

            {

                result += "%"+Convert.ToString(b[i], );

            }

            return result;

        }

        private string HexStringToString(string hs, Encoding encode)

        {

            //以%分割字符串，并去掉空字符

            string[] chars = hs.Split(new char[]{'%'},StringSplitOptions.RemoveEmptyEntries);

            byte[] b = new byte[chars.Length];

            //逐个字符变为16进制字节数据

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

            {

                b[i] = Convert.ToByte(chars[i], );

            }

            //按照指定编码将字节数组变为字符串

            return encode.GetString(b);

        } 

字符串转16进制字节数组

        /// <summary>

        /// 字符串转16进制字节数组

        /// </summary>

       /// <param name="hexString"></param>

        /// <returns></returns>

        private static byte[] strToToHexByte(string hexString)

        {

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

           if ((hexString.Length % ) != )

                 hexString += " ";

            byte[] returnBytes = new byte[hexString.Length / ];

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

                returnBytes[i] = Convert.ToByte(hexString.Substring(i * , ), );

            return returnBytes;

         }

字节数组转16进制字符串

/// <summary>

        /// 字节数组转16进制字符串

        /// </summary>

        /// <param name="bytes"></param>

        /// <returns></returns>

        public static string byteToHexStr(byte[] bytes)

       {

            string returnStr = "";

            if (bytes != null)

            {

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

                {

                     returnStr += bytes[i].ToString("X2");

                 }

             }

            return returnStr;

         }

从汉字转换到16进制

/// <summary>

        /// 从汉字转换到16进制

        /// </summary>

        /// <param name="s"></param>

        /// <param name="charset">编码,如"utf-8","gb2312"</param>

        /// <param name="fenge">是否每字符用逗号分隔</param>

       /// <returns></returns>

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

        {

            if ((s.Length % ) != )

            {

                 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 = ; i < bytes.Length; i++)

            {

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

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

                {

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

                 }

             }

            return str.ToLower();

         }

16进制转换成汉字

///<summary>

        /// 从16进制转换成汉字

        /// </summary>

        /// <param name="hex"></param>

        /// <param name="charset">编码,如"utf-8","gb2312"</param>

       /// <returns></returns>

        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 %  != )

            {

                 hex += "";//空格

             }

            // 需要将 hex 转换成 byte 数组。

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

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

            {

                try

                {

                    // 每两个字符是一个 byte。

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

                     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);

         }

//上述文章为转载!