C# Crc16 源代码

算法：

 public ushort[] CRC16Table = {  
           0x0, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,  
           0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,  
           0x1231, 0x210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,  
           0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,  
           0x2462, 0x3443, 0x420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,  
           0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,  
           0x3653, 0x2672, 0x1611, 0x630, 0x76D7, 0x66F6, 0x5695, 0x46B4,  
           0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,  
           0x48C4, 0x58E5, 0x6886, 0x78A7, 0x840, 0x1861, 0x2802, 0x3823,  
           0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,  
           0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0xA50, 0x3A33, 0x2A12,  
           0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,  
           0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0xC60, 0x1C41,  
           0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,  
           0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0xE70,  
           0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,  
           0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,  
           0x1080, 0xA1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,  
           0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,  
           0x2B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,  
           0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,  
           0x34E2, 0x24C3, 0x14A0, 0x481, 0x7466, 0x6447, 0x5424, 0x4405,  
           0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,  
           0x26D3, 0x36F2, 0x691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,  
           0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,  
           0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x8E1, 0x3882, 0x28A3,  
           0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,  
           0x4A75, 0x5A54, 0x6A37, 0x7A16, 0xAF1, 0x1AD0, 0x2AB3, 0x3A92,  
           0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,  
           0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0xCC1,  
           0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,  
           0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0xED1, 0x1EF0  
            };

        public int CRC16(Byte[] dat, int count)
        {
            int crc = 0;
            Byte crctemp;
            int i = 0;
            while (count > 0)
            {
                count -= 1;
                crctemp = Convert.ToByte(crc >> 8);
                crc = (crc << 8) & 0xFFFF;
                crc = (CRC16Table[crctemp ^ dat[i]] ^ crc) & 0xFFFF;
                i += 1;
            }
            return crc;
        }

        public bool Check(Byte[] portData)
        {
            Byte[] portTemp = new Byte[4];
            portTemp[0] = portData[1];
            portTemp[1] = portData[2];
            portTemp[2] = 0;
            portTemp[3] = 0;

            int crcTemp = CRC16(portTemp, 2);
            portTemp[2] = Convert.ToByte(crcTemp >> 8);
            portTemp[3] = Convert.ToByte(crcTemp & 255);

            if (portTemp[2] == portData[3] && portTemp[3] == portData[4])
            {
                Console.WriteLine("通过CRC校验，这是正确的停车卡号码");
                return true;
            }
            else
            {
                Console.WriteLine("不能通过CRC校验，不正确的停车卡");
                return false;
            }
        }

调用：

            byte[] aaff = { 0xdd, 0xdd, 0xff };
            int aa = CRC16(aaff, aaff.Length);
            string bb = Convert.ToString(aa, 16).ToUpper();