//16进制字符串转为字节数组
        private byte[] hexToByteArr(string hexStr)
        {
            hexStr = hexStr.ToLower();
            string[] hexStrSplit = hexStr.Split(‘ ‘);
            byte[] byteArr = new byte[hexStrSplit.Length / 2];
            int i = 0;
            foreach (string hex in hexStrSplit)
            {
                int value = Convert.ToInt32(hex, 16);
                byteArr[i] = (byte)value;
            }
            return byteArr;
        }