C# 16进制字符串的判断和转换

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判断

        //判断一个字符串是否为 aa 55 a1 这样的字符串，是的就返回byte个数，否则，返回-1        public int IsHex(string str)        {            int i = 0,len=-1;            //string str = "12312412410afed123";            string pstr = "^";            if (str.Length % 3 == 2) //最后面没有空格            {                len = (str.Length + 1) / 3;                for (i = 0; i < len - 1; i++)                    pstr = pstr + "[0-9a-fA-F][0-9a-fA-F][: :]";                pstr = pstr + "[0-9a-fA-F][0-9a-fA-F]";            }            else if (str.Length % 3 == 0) //最后面有空格            {                len = str.Length / 3;                for (i = 0; i < len ; i++)                    pstr = pstr + "[0-9a-fA-F][0-9a-fA-F][: :]";            }            else            {               // Console.WriteLine("not");                return -1;            }           // string pstr = "^[0-9a-fA-F][0-9a-fA-F][: :]";           // Console.WriteLine(pstr);            if (System.Text.RegularExpressions.Regex.IsMatch(str, pstr))            {                //是地                //Console.WriteLine("yes");                return len;            }            else            {                return -1;               // Console.WriteLine("not");            }        }

转换

        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;        }