1.请问c#中如何将十进制数的字符串转化成十六进制数的字符串//十进制转二进制Console.WriteLine("十进制166的二进制表示: "+Convert.ToString(166, 2));//十进制转八进制Console.WriteLine("十进制166的八进制表示: "+Convert.ToString(166, 8));//十进制转十六进制Console.WriteLine("十进制166的十六进制表示: "+Convert.ToString(166, 16));    //二进制转十进制Console.WriteLine("二进制 111101 的十进制表示: "+Convert.ToInt32("111101", 2));//八进制转十进制Console.WriteLine("八进制 44 的十进制表示: "+Convert.ToInt32("44", 8));//十六进制转十进制Console.WriteLine("十六进制 CC的十进制表示: "+Convert.ToInt32("CC", 16));2.在串口通讯过程中，经常要用到 16进制与字符串、字节数组之间的转换//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 = 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;        }        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 = 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);        }         /// 
        /// 字符串转16进制字节数组        /// 
       ///         /// 
             private 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;         }  /// 
        /// 字节数组转16进制字符串        /// 
        ///         /// 
             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;         }  /// 
        /// 从汉字转换到16进制        /// 
        ///         /// 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进制转换成汉字        /// 
        ///         /// 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             }            // 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);         }//上述文章为转载!