socket粘包、断包、校验

try
{
    byte[] buffer = UDPClient.Receive(ref _udpOpto.localPoint);
    numberOfBytesRead = 0;
    numberOfBytesRead = buffer.Length;
    receiveBuffer = new byte[numberOfBytesRead];                    
    Array.Copy(buffer, 0, receiveBuffer, 0, numberOfBytesRead);
    Array.Clear(buffer, 0, receiveBuffer.Length);

    //断包处理
    if (bodyWriteIndex > 0)
    {
        int writeLength = Math.Min(bodyLength, numberOfBytesRead);
        Array.Copy(receiveBuffer, 0, bodyBuffer, bodyWriteIndex, writeLength);
        readIndex += writeLength;
        bodyWriteIndex += writeLength;
    }
    //新包/粘包
    else
    {
        //验证帧头
        string s = BitConverter.ToString(receiveBuffer).Replace("-", "");
        int i = s.IndexOf("AA01");
        if (i != 0)
        {
            return;
        }
        int writeLength = Math.Min(bodyLength, numberOfBytesRead - readIndex);
        bodyBuffer = new byte[bodyLength];
        Array.Copy(receiveBuffer, readIndex, bodyBuffer, 0, writeLength);
        readIndex += writeLength;
        bodyWriteIndex += writeLength;
    }
    Array.Clear(receiveBuffer, 0, receiveBuffer.Length);
                    
    //完成一个包
    if (bodyWriteIndex == bodyLength)
    {
        readIndex = 0;
        bodyWriteIndex = 0;
        //验收帧头
        string s = BitConverter.ToString(bodyBuffer).Replace("-", "");
        int dh = s.IndexOf("AA01");        
        if (dh == 0)
        {
            int dSum = 0;
            for (int i = 0; i<bodyBuffer.Length - 1; i++)
            {
                dSum += bodyBuffer[i];
            }
            //验证校验码
            if (dSum % 256 == bodyBuffer[82])
            {
                xxModel pm = bufferToModel(bodyBuffer);
                Array.Clear(bodyBuffer, 0, bodyBuffer.Length);
                //异步
                Task.Run(() =>
                {
                    //存储
                });
            }
        }
    }
}
catch (ThreadAbortException ex)
{
    //不作处理          
}
catch (Exception ex)
{
    LogHelper.WriteLog(LogFile.Error, "[错误信息]:" + ex.ToString());
}