c# - 使用 .NET 框架读取串口的正确方法是什么？

Question

我在这里阅读了很多关于如何使用 .NET SerialPort 类从串行端口读取数据的问题，但没有一种推荐方法对我来说是完全有效的。

这是我现在使用的代码:

SerialPort port = new SerialPort("COM1");
port.DataReceived += new SerialDataReceivedEventHandler(MyDataReceivedHandler);

和事件处理程序:

void MyDataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
    int count = port.BytesToRead;
    byte[] ByteArray = new byte[count];
    port.Read(ByteArray, 0, count);
}

但我仍然有时会丢失数据。我尝试了不同的方式来读取事件处理程序中的数据，但没有成功。

随着 .NET 4.5 为执行一些异步任务带来新的可能性，例如 ReadAsync似乎可用于 SerialPort 流的方法，我很想知道处理这些情况的推荐方法是什么。

Answer 1

你能试试这样吗，例如我想你想利用的是 port.ReadExisting() 方法

 using System;
 using System.IO.Ports;

 class SerialPortProgram 
 { 
  // Create the serial port with basic settings 
    private SerialPort port = new   SerialPort("COM1",
      9600, Parity.None, 8, StopBits.One); 
    [STAThread] 
    static void Main(string[] args) 
    { 
      // Instatiate this 
      SerialPortProgram(); 
    } 

    private static void SerialPortProgram() 
    { 
        Console.WriteLine("Incoming Data:");
         // Attach a method to be called when there
         // is data waiting in the port's buffer 
        port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived); 
        // Begin communications 
        port.Open(); 
        // Enter an application loop to keep this thread alive 
        Console.ReadLine();
     } 

    private void port_DataReceived(object sender, SerialDataReceivedEventArgs e) 
    { 
       // Show all the incoming data in the port's buffer
       Console.WriteLine(port.ReadExisting()); 
    } 
}

或者你想根据你想做的来做，你可以试试这个

public class MySerialReader : IDisposable
{
  private SerialPort serialPort;
  private Queue<byte> recievedData = new Queue<byte>();

  public MySerialReader()
  {
    serialPort = new SerialPort();
    serialPort.Open();
    serialPort.DataReceived += serialPort_DataReceived;
  }

  void serialPort_DataReceived(object s, SerialDataReceivedEventArgs e)
  {
    byte[] data = new byte[serialPort.BytesToRead];
    serialPort.Read(data, 0, data.Length);
    data.ToList().ForEach(b => recievedData.Enqueue(b));
    processData();
  }

  void processData()
  {
    // Determine if we have a "packet" in the queue
    if (recievedData.Count > 50)
    {
        var packet = Enumerable.Range(0, 50).Select(i => recievedData.Dequeue());
    }
  }

  public void Dispose()
  {
        if (serialPort != null)
        {
            serialPort.Dispose();
        }
  }