SerialPort SPCom = new SerialPort("COM1",9600);
SPCom.Open();

 private void SPCom_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            //定义变量
            byte[] BufferBytes,ReceivedBuff;
            

            int Count;
            Count = SPCom.BytesToRead;

            //得到数据
              BufferBytes = new Byte[Count];
            SPCom.Read(BufferBytes, 0, Count);

            for (int i = 0; i < Count; i++)
            {
                ReceivedBuff[i]= BufferBytes[i];
            }
        }

------解决方案--------------------

C# code
1using System; 
 2using System.IO.Ports; 
 3using System.Collections; 
 4using System.Collections.Generic; 
 5using System.Windows.Forms; 
 6using System.Runtime.InteropServices; 
 7 
 8namespace Lordeo.AssetMan.PPC.App 
 9{ 
 10  public class GpsMonitor 
 11  { 
 12    private SerialPort m_serialPort; 
 13 
 14    private System.Windows.Forms.Timer m_timer; 
 15    private const int defaultTimerInterval = 800; //越快越容易出错 
  16    //读取到事件 
  17    public event EventHandler OnDataRecieved; 
 18    //临时存储读取的信息 
  19    private string m_dataReaded = string.Empty; 
 20 
 21    /**////  <summary> 
  22    /// 构造 
  23    ///  </summary> 
  24    public GpsMonitor() 
 25    { 
 26      //timer 
  27      m_timer = new System.Windows.Forms.Timer(); 
 28      m_timer.Interval = defaultTimerInterval; 
 29      m_timer.Tick += new EventHandler(Timer_Tick); 
 30 
 31      //设置端口的默认值 
  32      m_serialPort = new SerialPort(); 
 33      m_serialPort.ReadBufferSize = 2048; 
 34      m_serialPort.BaudRate = 4800; //P800默认的速率，过高的速率容易产生误码 
  35      m_serialPort.DataBits = 8; 
 36      m_serialPort.Parity = Parity.None; 
 37      m_serialPort.StopBits = StopBits.One; 
 38      m_serialPort.ReadTimeout = 2000;//超时 
  39      m_serialPort.PortName = "COM4"; //多数GPS都用COM4 
  40 
 41      m_serialPort.ErrorReceived += new SerialErrorReceivedEventHandler(SerialPort_ErrorReceived); 
 42    } 
 43 
 44    private void SerialPort_ErrorReceived(object sender, SerialErrorReceivedEventArgs e) 
 45    { 
 46      this.Message = e.ToString(); 
 47    } 
 48 
 49    timer#region timer 
 50    /**////  <summary> 
  51    /// 计时器工作 
  52    ///  </summary> 
  53    ///  <param name="sender"> </param> 
  54    ///  <param name="e"> </param> 
  55    private void Timer_Tick(object sender, EventArgs e) 
 56    { 
 57      try 
 58      { 
 59        if (!string.IsNullOrEmpty(m_serialPort.ReadLine())) 
 60        {