大家给看看这段程序，谢谢了
class protocol:IDisposable
    {
        private static protocol instance;
        /// <summary>
        /// 实例化协议类
        /// </summary>
        /// <returns></returns>
        public protocol()
        {
 
        }
        private string _model;
        /// <summary>
        /// 累加和后的指令属性
        /// </summary>
        /// <returns></returns>
        public string _Model
        {
            get
            {
                return _model;
            }
            set 
            {
                _model = value;
            }
        }
        /// <summary>
        /// 输入一个参数将其进行累加和及异或校验
        /// </summary>
        /// <param name="ls"></param>
        /// <returns></returns>
        private protocol(string ls)
        {
            #region      //生成指令代码
            char[] c_ls = ls.ToCharArray();
            int sum = 0;//累加和
            long xor = 0;//异或
            int model = 0;//取模
            string ls_jy = null;//临时校验参数
            ASCIIEncoding AE1 = new ASCIIEncoding();
            for (int i = 0; i < c_ls.Length; i++)
            {
                byte[] ByteArray1 = AE1.GetBytes(c_ls[i].ToString());
             &nbs