网络编程常用字符串转换函数

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public static 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 = 0; i < b.Length; i++)//逐字节变为16进制字符，以%隔开            {                result += "%" + Convert.ToString(b[i], 16);            }            return result;        }        public static 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 = 0; i < chars.Length; i++)            {                b[i] = Convert.ToByte(chars[i], 16);            }            //按照指定编码将字节数组变为字符串            return encode.GetString(b);        }        /// <summary>        /// 字符串转16进制字节数组        /// </summary>        /// <param name="hexString"></param>        /// <returns></returns>        public static byte[] strToToHexByte(string hexString)        {            hexString = hexString.Replace(" ", "");            if ((hexString.Length % 2) != 0)                hexString += " ";            byte[] returnBytes = new byte[hexString.Length / 2];            for (int i = 0; i < returnBytes.Length; i++)                returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);            return returnBytes;        }        /// <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 = 0; i < bytes.Length; i++)                {                    returnStr += bytes[i].ToString("X2");                }            }            return returnStr;        }        /// <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 % 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();        }        ///<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 % 2 != 0)            {                hex += "20";//空格            }            // 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);        }    }                 /// <summary>        /// 十六进制换算为十进制        /// </summary>        /// <param name="strColorValue"></param>        /// <returns></returns>        public  int GetHexadecimalValue(String strColorValue)        {            char[] nums = strColorValue.ToCharArray();            int total = 0;            try            {                for (int i = 0; i < nums.Length; i++)                {                    String strNum = nums[i].ToString().ToUpper();                    switch (strNum)                    {                        case "A":                            strNum = "10";                            break;                        case "B":                            strNum = "11";                            break;                        case "C":                            strNum = "12";                            break;                        case "D":                            strNum = "13";                            break;                        case "E":                            strNum = "14";                            break;                        case "F":                            strNum = "15";                            break;                        default:                            break;                    }                    double power = Math.Pow(16, Convert.ToDouble(nums.Length - i - 1));                    total += Convert.ToInt32(strNum) * Convert.ToInt32(power);                }            }            catch (System.Exception ex)            {                String strErorr = ex.ToString();                return 0;            }            return total;        }
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