【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 PortDataReceivedEventHandleReceived;
public event SerialErrorReceivedEventHandlerError;
public SerialPortport;
public bool ReceiveEventFlag = false ; // 接收事件是否有效false表示有效

public PortData( string sPortName, int baudrate,Parityparity,SerialInterface.SerialModemode)
{
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,SerialErrorReceivedEventArgse)
{
if (Error != null )Error(sender,e);
}
// 数据接收
public void DataReceived( object sender,SerialDataReceivedEventArgse)
{
// 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,PortDataReciveEventArgse);
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。