c# CRC16位校验辅助类

    public class CRC16Helper

    {

        /// <summary>

        /// CRC校验

        /// </summary>

        /// <param name="data">校验数据</param>

        /// <returns>高低8位</returns>

        public static string CRCCalc(string data)

        {

            string[] datas = data.Split(' ');

            List<byte> bytedata = new List<byte>();

            foreach (string str in datas)

            {

                bytedata.Add(byte.Parse(str, System.Globalization.NumberStyles.AllowHexSpecifier));

            }

            byte[] crcbuf = bytedata.ToArray();

            //计算并填写CRC校验码

            int crc = 0xffff;

            int len = crcbuf.Length;

            for (int n = ; n < len; n++)

            {

                byte i;

                crc = crc ^ crcbuf[n];

                for (i = ; i < ; i++)

                {

                    int TT;

                    TT = crc & ;

                    crc = crc >> ;

                    crc = crc & 0x7fff;

                    if (TT == )

                    {

                        crc = crc ^ 0xa001;

                    }

                    crc = crc & 0xffff;

                }

            }

            string[] redata = new string[];

            redata[] = Convert.ToString((byte)((crc >> ) & 0xff), );

            redata[] = Convert.ToString((byte)((crc & 0xff)), );

            return data + " " + redata[] + " " + redata[];

        }

        /// <summary>

        /// CRC校验

        /// </summary>

        /// <param name="bytes"></param>

        /// <returns></returns>

        public static byte[] CRC16(byte[] bytes)

        {

            //计算并填写CRC校验码

            int crc = 0xffff;

            int len = bytes.Length;

            for (int n = ; n < len; n++)

            {

                byte i;

                crc = crc ^ bytes[n];

                for (i = ; i < ; i++)

                {

                    int TT;

                    TT = crc & ;

                    crc = crc >> ;

                    crc = crc & 0x7fff;

                    if (TT == )

                    {

                        crc = crc ^ 0xa001;

                    }

                    crc = crc & 0xffff;

                }

            }

            var nl = bytes.Length + ;

            //生成的两位校验码

            byte[] redata = new byte[];

            redata[] = (byte)((crc & 0xff));

            redata[] = (byte)((crc >> ) & 0xff);

            //重新组织字节数组

            var newByte = new byte[nl];

            for (int i = ; i < bytes.Length; i++)

            {

                newByte[i] = bytes[i];

            }

            newByte[nl - ] = (byte)redata[];

            newByte[nl -] = redata[];

            return newByte;

        }

    }

第一个方法是把校验位返回，返回的是字符串

第二个是在第一个的基础上改的，返回的是加了校验位之后的数据，字节数组。

说明：代码来自好互联网。