从Microsoft .Net 2.0版本以后，就默认提供了System.IO.Ports.SerialPort类，用户可以非常简单地编写少量代码就完成串口的信息收发程序。
串口端口号搜索 string[] portList = System.IO.Ports.SerialPort.GetPortNames(); for (int i = 0; i < portList.Length; i++) { string name = portList[i]; comboBox.Items.Add(name); } 串口属性参数设置 SerialPort mySerialPort = new SerialPort("COM2");//端口 mySerialPort.BaudRate = 9600;//波特率 mySerialPort.Parity = Parity.None;//校验位 mySerialPort.StopBits = StopBits.One;//停止位 mySerialPort.DataBits = 8;//数据位 mySerialPort.Handshake = Handshake.Non; mySerialPort.ReadTimeout = 1500; mySerialPort.DtrEnable = true;//启用数据终端就绪信息 mySerialPort.Encoding = Encoding.UTF8; mySerialPort.ReceivedBytesThreshold = 1;//DataReceived触发前内部输入缓冲器的字节数 mySerialPort.DataReceived += new SerialDataReceivedEvenHandler(DataReceive_Method); mySerialPort.Open(); 串口发送信息 // Write a string port.Write("Hello World"); // Write a set of bytes port.Write(new byte[] { 0x0A, 0xE2, 0xFF }, 0, 3); // Close the port port.Close(); 串口接收信息 string serialReadString; private void port_DataReceived(object sender, SerialDataReceivedEventArgs e) { serialReadString = port.ReadExisting()); this.txt1.Invoke( new MethodInvoker(delegate { this.txt1.AppendText(serialReadString); })); } 循环接收数据 void com_DataReceived(object sender, SerialDataReceivedEventArgs e) { // Use either the binary OR the string technique (but not both) // Buffer and process binary data while (com.BytesToRead > 0) bBuffer.Add((byte)com.ReadByte()); ProcessBuffer(bBuffer); // Buffer string data sBuffer += com.ReadExisting(); ProcessBuffer(sBuffer); } private void ProcessBuffer(string sBuffer) { // Look in the string for useful information // then remove the useful data from the buffer } private void ProcessBuffer(List<byte> bBuffer) { // Look in the byte array for useful information // then remove the useful data from the buffer }