C# 异或校验算法

   public partial class FormCRC : Form
    {
        public FormCRC()
        {
            InitializeComponent();
        }

        private void FormCRC_Load(object sender, EventArgs e)
        {

        }
        /// <summary>
        /// CRC异或校验 
        /// </summary>
        /// <param name="cmdString">命令字符串</param>
        /// <returns></returns>
        private static string CRC(string cmdString)
        {
            try
            {
                //CRC寄存器
                int CRCCode = 0;
                //将字符串拆分成为16进制字节数据然后两位两位进行异或校验
                for (int i = 1; i < cmdString.Length / 2; i++)
                {
                    string cmdHex = cmdString.Substring(i * 2, 2);
                    if (i == 1)
                    {
                        string cmdPrvHex = cmdString.Substring((i - 1) * 2, 2);
                        CRCCode = (byte)Convert.ToInt32(cmdPrvHex, 16) ^ (byte)Convert.ToInt32(cmdHex, 16);
                    }
                    else
                    {
                        CRCCode = (byte)CRCCode ^ (byte)Convert.ToInt32(cmdHex, 16);
                    }
                }
                return Convert.ToString(CRCCode, 16).ToUpper();//返回16进制校验码
            }
            catch
            {
                throw;
            }
        }

        private void btnConvert_Click(object sender, EventArgs e)
        {
            try
            {
                txtCRCCode.Text = CRC(txtCMDString.Text.Replace(" ", ""));
            }
            catch
            {
                MessageBox.Show("校验失败,请检查字符串是否包含特殊字符");
            }
        }
    }