多个串口,最好用多线程,这样比较方便 ，
也可以在一个线程中,一个一个读串口数据! 本源码是从网上收集的，用于保留自己以后使用，同时希望对需要的朋友提供一点学习的资料。

using System;
using System.IO.Ports;
using System.Threading;
using System.Text;

namespace Tangxu.Common
{
    public class ReadCom
    {
        public ReadCom()
        {
            _ReadConfig = new ReadConfigure(System.Environment.CurrentDirectory + "\\Com_Info.xml");
        }

        public ReadCom(string sCom,int nBaud):this()
        {
       
        }

        private byte[] _ReadBuffer;
        private SerialPort ss_port = new SerialPort();
        private static int nReadCount = 0;
        private ReadConfigure _ReadConfig;

        #region Initialize com port

        public bool InitCom()//初始化建串口类实例
        {
          // return true;
            try
            {
                ss_port.PortName = _ReadConfig.GetNodeValue("PORT");// _sComPort;
                ss_port.BaudRate = int.Parse(_ReadConfig.GetNodeValue("BAUD"));//_nBaud;
                ss_port.ReadBufferSize = 10240;
                ss_port.DataBits = int.Parse(_ReadConfig.GetNodeValue("DATA"));//8;
                switch (_ReadConfig.GetNodeValue("PARITY"))
                {
                    case "None":
                        ss_port.Parity = Parity.None;
                        break;
                    case "Even":
                        ss_port.Parity = Parity.Even;