C#中的Byte，String，Int，Hex之间的转换函数

        /// <summary>
        /// 16进制字符串转换为二进制数组
        /// </summary>
        /// <param name="hexstring">用空格切割字符串</param>
        /// <returns>返回一个二进制字符串</returns>
        public static byte[] HexStringToBinary(string hexstring)
        {

            string[] tmpary = hexstring.Trim().Split(' ');
            byte[] buff = new byte[tmpary.Length];
            for (int i = 0; i < buff.Length; i++)
            {
                buff[i] = Convert.ToByte(tmpary[i], 16);
            }
            return buff;
        }

https://www.cnblogs.com/ThreeS/articles/9377547.html