class BCD
    {
        public enum BcdType
        {
            码8421,
            码5421,
            码2421,
            余3码,
            余3循环码
        }
        /// <summary>
        /// 或BCD表数据
        /// </summary>
        /// <returns></returns>
        private static DataTable GetBcdTable()
        {
            DataTable _BCDTable = new DataTable();
            _BCDTable.Columns.Add("十进制数");
            _BCDTable.Columns.Add("码8421");
            _BCDTable.Columns.Add("码5421");
            _BCDTable.Columns.Add("码2421");
            _BCDTable.Columns.Add("余3码");
            _BCDTable.Columns.Add("余3循环码");

            _BCDTable.Rows.Add(new object[] { "0", "0000", "0000", "0000", "0011", "0010" });
            _BCDTable.Rows.Add(new object[] { "1", "0001", "0001", "0001", "0100", "0110" });
            _BCDTable.Rows.Add(new object[] { "2", "0010", "0010", "0010", "0101", "0111" });
            _BCDTable.Rows.Add(new object[] { "3", "0011", "0011", "0011", "0110", "0101" });
            _BCDTable.Rows.Add(new object[] { "4", "0100", "0100", "0100", "0111", "0100" });
            _BCDTable.Rows.Add(new object[] { "5", "0101", "1000", "1011", "1000", "1100" });
            _BCDTable.Rows.Add(new object[] { "6", "0110", "1001", "1100", "1001", "1101" });
            _BCDTable.Rows.Add(new object[] { "7", "0111", "1010", "1101", "1010", "1111" });
            _BCDTable.Rows.Add(new object[] { "8", "1000", "1011", "1110", "1011", "1110" });
            _BCDTable.Rows.Add(new object[] { "9", "1001", "1100", "1111", "1100", "1010" });
            return _BCDTable;

        }

        /// <summary>
        /// BCD解码
        /// </summary>
        /// <param name="p_Value">BCD码</param>
        /// <param name="p_BcdType">BCD码类型</param>
        /// <param name="p_LongValue">返回数据</param>
        /// <returns>false 解码失败 true解编成功</returns>
        public static ulong GetBcdDecode(string p_Value, BcdType p_BcdType)
        {
            DataTable _BCDTable = GetBcdTable();
          ulong  p_LongValue = 0;
            StringBuilder _Return = new StringBuilder();
            if (p_Value.Length % 4 == 0)
            {
                int _Count = p_Value.Length / 4;
                string _ValueText = p_Value.ToString();
                for (int i = 0; i != _Count; i++)
                {
                    DataRow[] _Row = _BCDTable.Select(p_BcdType.ToString() + "=" + _ValueText.Substring(i * 4, 4));
                    if (_Row.Length == 0) return 0;
                    _Return.Append(_Row[0]["十进制数"].ToString());
                }
                p_LongValue = Convert.ToUInt64(_Return.ToString());
                return p_LongValue;
            }
            return 0;
        }

        /// <summary>
        /// BCD