1 using System;
2 using System.Collections.Generic;
3 using System.IO.Ports;
4 using System.Linq;
5 using System.Text;
6 using System.Threading.Tasks;

1 private SerialPort serialPort = new SerialPort();
2 public static bool IsOpen { get; set; }  //标志量

 1 public void InitlizeBaudRate(out string[] baudRate)
 2 {
 3     baudRate = new string[]{};  //初始化
 4     baudRate[0] = "2400";
 5     baudRate[1] = "4800";
 6     baudRate[2] = "9600";
 7     baudRate[3] = "19200";
 8     baudRate[4] = "38400";
 9     baudRate[5] = "57600";
10     baudRate[6] = "115200";
11 }

 1 public void OpenSerialPort(string portName, int baudRate)
 2 {
 3     serialPort.PortName = portName;
 4     serialPort.BaudRate = baudRate;
 5     //serialPort.Parity = Parity.None;
 6     //serialPort.StopBits = StopBits.One;
 7     //serialPort.DataBits = 8;
 8     serialPort.Open();
 9     IsOpen = true;
10 }

1 public void CloseSerialPort()
2 {
3     if (serialPort.IsOpen)
4     {
5         serialPort.Close();
6     }
7 }

1 public void WriteToSerialPort(string data)
2 {
3     if (serialPort.IsOpen)
4     {
5         serialPort.WriteLine(data);
6     }
7 }

 1 public string ReadFromSerialPort()
 2 {
 3     if (serialPort.IsOpen)
 4     {
 5         return serialPort.ReadExisting();
 6     }
 7     return null;
 8 }
 9 
10 public string ReadLine()
11 {
12     if (serialPort.IsOpen)
13     {
14         return serialPort.ReadLine();
15     }
16     return null;
17 }

1 public void DiscardInBuffer()
2 {
3     if (serialPort.IsOpen)
4     {
5         serialPort.DiscardInBuffer();
6     }
7 }

1 private void SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
2 {
3     string data = serialPort.ReadExisting();
4     // 这里可以触发一个事件，让其他部分的代码知道有数据接收
5     OnDataReceived(data);
6 }

1 public event EventHandler<string> DataReceived;
2 
3 protected virtual void OnDataReceived(string data)
4 {
5     DataReceived?.Invoke(this, data);
6 }