c#串口多线程收发要怎么实现

            }

public static void Run(string serialName )
        {
            SerialPort sp1 = new SerialPort();
            sp1.PortName = serialName;//设置串口名
            sp1.BaudRate = 57600;       //波特率
            sp1.DataBits = 8;       //数据位
            sp1.StopBits = StopBits.One;//停止位
            sp1.Parity = Parity.None; //校验位
 
            sp1.DataReceived += new SerialDataReceivedEventHandler(sp1_DataReceived);//数据接收事件
            sp1.DtrEnable = true;//准备就绪     
            sp1.RtsEnable = true;
            sp1.ReadTimeout = 1000;//设置数据读取超时为1秒
            portcom.Add(sp1);//保存串口实例
            if (sp1.IsOpen == true)//如果打开状态，则先关闭一下
            {
                sp1.Close();
            }
            sp1.Open();
        }

 private static void sp1_DataReceived(object sender SerialDataReceivedEventArgs e)
        {
            Thread.Sleep(50);
            lock (ojb)
            {
                SerialPort sp = sender as SerialPort;//获取当前接收数据的串口
 
 
                if (!sp.IsOpen)//安全措施
                {
                    return;
                }
                int len = sp.BytesToRead;//数据的长度
                byte[] receivedData = new byte[len];
                sp.Read(receivedData 0 len);//读取数据
            }
        }