【C#】串口操作实用类

  做工业通信有很长时间了，特别是串口（232/485)，有VB/VC/C各种版本的串口操作代码，这些代码也经过了多年的现场考验，应该说是比较健壮的代码，但是目前却没有C#相对成熟的串口操作代码，最近用Moxa的设备开发基于WinCE5.0的串口操作代码，所以就扩充完善了一下串口操作，特别是SendCommand函数，这是我比较常用的主从通信代码，不喜欢用事件或线程接数据，在规定的超时时间内直接循环判断要接收的数据。

     下面是具体的代码：   

 

public class PortData
   {
       public event PortDataReceivedEventHandle Received;
       public event SerialErrorReceivedEventHandler Error;
       public SerialPort port;
       public bool ReceiveEventFlag = false;  //接收事件是否有效 false表示有效

       public PortData(string sPortName, int baudrate,Parity parity,SerialInterface.SerialMode mode)
       {
           port = new SerialPort(sPortName, baudrate, parity, 8, StopBits.One);
           port.RtsEnable = true;
           port.ReadTimeout = 3000;
           port.DataReceived += new SerialDataReceivedEventHandler(DataReceived);
           port.ErrorReceived += new SerialErrorReceivedEventHandler(ErrorEvent);
       }

       ~PortData()
       {
           Close();
       }
       public void Open()
       {
           if (!port.IsOpen)
           {
               port.Open();
           }
       }

       public void Close()
       {
           if (port.IsOpen)
           {
               port.Close();
           }
       }
       //数据发送
       public void SendData(byte[] data)
       {
           if (port.IsOpen)
           {
               port.Write(data, 0, data.Length);
           }
       }
       public void SendData(byte[] data,int offset,int count)
       {
           if (port.IsOpen)
           {
               port.Write(data, offset, count);
           }
       }
       //发送命令
       public int SendCommand(byte[] SendData, ref  byte[] ReceiveData,int Overtime)
       {

           if(port.IsOpen)
           {
               ReceiveEventFlag = true;        //关闭接收事件
               port.DiscardInBuffer();         //清空接收缓冲区
               port.Write(SendData, 0, SendData.Length);
               int num=0,ret=0;
               while (num++ < Overtime)
               {
                   if (port.BytesToRead >= ReceiveData.Length) break;
                   System.Threading.Thread.Sleep(1);
               }
               if (port.BytesToRead >= ReceiveData.Length)
                   ret = port.Read(ReceiveData, 0, ReceiveData.Length);
               ReceiveEventFlag = false;       //打开事件
               return ret;
           }
           return -1;
       }

       public void ErrorEvent(object sender, SerialErrorReceivedEventArgs e)
       {
           if (Error != null) Error(sender, e);
       }
       //数据接收
       public void DataReceived(object sender, SerialDataReceivedEventArgs e)
       {
           //禁止接收事件时直接退出
           if (ReceiveEventFlag) return;

           byte[] data = new byte[port.BytesToRead];
           port.Read(data, 0, data.Length);
           if (Received != null) Received(sender, new PortDataReciveEventArgs(data));
       }

       public bool IsOpen()
       {
           return port.IsOpen;
       }
   }
   public delegate void PortDataReceivedEventHandle(object sender, PortDataReciveEventArgs e);
   public class PortDataReciveEventArgs : EventArgs
   {
       public PortDataReciveEventArgs()
       {
           this.data = null;
       }

       public PortDataReciveEventArgs(byte[] data)
       {
           this.data = data;
       }

       private byte[] data;

       public byte[] Data
       {
           get { return data; }
           set { data = value; }
       }
   }

【附注】1~9 串口的名称是 "COMx:",>9的以前用\\\\.\\COMx:比较好使，但是在moxa 661设备上却不行，要用如下格式"$device\\COM" + PortNo.ToString() + "\0"，也许这是moxa修改了相应的串口驱动。