mes-client/PLCDataReader/ClassFile/BaseUtil.cs

namespace ClassFile
{
    class BaseUtil
    {
        /// <summary>
        /// 获取LRC
        /// </summary>
        /// <param name="SQL"></param>
        public static string getLRC(string SENDMESSAGE)
        {
            string message = SENDMESSAGE.Trim();
            if (message.Length % 2 != 0)
            {
                message = message + "0";
            }

            int LRC = 0x0;
            for (int i = 0; i < message.Length; i = i + 2)
            {
                int inside = int.Parse(message.Substring(i, 1).ToString() + message.Substring(i + 1, 1).ToString(), System.Globalization.NumberStyles.HexNumber);
                LRC += inside;
            }
            string _LRC = string.Format("{0:X2}", LRC);
            string LRCre = "";
            for (int i = 0; i < _LRC.Length; i++)
            {
                int index;
                if (i != _LRC.Length - 1)
                {
                    index = 0xF - int.Parse(_LRC.Substring(i, 1).ToString(), System.Globalization.NumberStyles.HexNumber);
                }
                else
                    index = 0xF - int.Parse(_LRC.Substring(i, 1).ToString(), System.Globalization.NumberStyles.HexNumber) + 1;
                LRCre += string.Format("{0:X}", index);
            }

            return LRCre;
        }
    }
}