C# ModBusCRC16校验

串口发送命令需要CRC16校验，找到一个好用的代码，记录下

 #region 16位CRC校验public static class CRC16{/// <summary>/// CRC校验，参数data为byte数组/// </summary>/// <param name="data">校验数据，字节数组</param>/// <returns>字节0是高8位，字节1是低8位</returns>public static byte[] CRCCalc(byte[] data){//crc计算赋初始值int crc = 0xffff;for (int i = 0; i < data.Length; i++){crc = crc ^ data[i];for (int j = 0; j < 8; j++){int temp;temp = crc & 1;crc = crc >> 1;crc = crc & 0x7fff;if (temp == 1){crc = crc ^ 0xa001;}crc = crc & 0xffff;}}//CRC寄存器的高低位进行互换byte[] crc16 = new byte[2];//CRC寄存器的高8位变成低8位，crc16[1] = (byte)((crc >> 8) & 0xff);//CRC寄存器的低8位变成高8位crc16[0] = (byte)(crc & 0xff);return crc16;}/// <summary>/// CRC校验，参数为空格或逗号间隔的字符串/// </summary>/// <param name="data">校验数据，逗号或空格间隔的16进制字符串(带有0x或0X也可以),逗号与空格不能混用</param>/// <returns>字节0是高8位，字节1是低8位</returns>public static byte[] CRCCalc(string data){//分隔符是空格还是逗号进行分类，并去除输入字符串中的多余空格IEnumerable<string> datac = data.Contains(",") ? data.Replace(" ", "").Replace("0x", "").Replace("0X", "").Trim().Split(',') : data.Replace("0x", "").Replace("0X", "").Split(' ').ToList().Where(u => u != "");List<byte> bytedata = new List<byte>();foreach (string str in datac){bytedata.Add(byte.Parse(str, System.Globalization.NumberStyles.AllowHexSpecifier));}byte[] crcbuf = bytedata.ToArray();//crc计算赋初始值return CRCCalc(crcbuf);}/// <summary>///  CRC校验，截取data中的一段进行CRC16校验/// </summary>/// <param name="data">校验数据，字节数组</param>/// <param name="offset">从头开始偏移几个byte</param>/// <param name="length">偏移后取几个字节byte</param>/// <returns>字节0是高8位，字节1是低8位</returns>public static byte[] CRCCalc(byte[] data, int offset, int length){byte[] Tdata = data.Skip(offset).Take(length).ToArray();return CRCCalc(Tdata);}}#endregion