使用.NET框架读取串口的正确方法是什么？

Question

我在这里已经阅读了很多关于如何使用.NET SerialPort类从串口读取数据的问题，但没有一种推荐的方法对我来说已经证明是完全有效的。

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);
}

但有时我仍然缺少一些数据。我尝试过在事件处理程序中读取数据的不同方法，但没有运气。

由于.NET 4.5为执行某些异步任务带来了新的可能性，例如可能在SerialPort流上使用的ReadAsync方法，我很想知道处理这些情况的推荐方法是什么。

Answer 1

你可以试试这样的东西，例如我认为你想要使用的是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()); 
    } 
}

或者你想根据你想要做的事情去做，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();
        }
  }

Answer 2

我使用了与@MethodMan相似的代码，但我必须跟踪串口发送的数据，并查找终止字符以了解串口何时完成发送数据。

private string buffer { get; set; }
private SerialPort _port { get; set; }

public Port() 
{
    _port = new SerialPort();
    _port.DataReceived += new SerialDataReceivedEventHandler(dataReceived);
    buffer = string.Empty;
}

private void dataReceived(object sender, SerialDataReceivedEventArgs e)
{    
    buffer += _port.ReadExisting();

    //test for termination character in buffer
    if (buffer.Contains("\r\n"))
    {
        //run code on data received from serial port
    }
}

Answer 3

    using System;
    using System.IO.Ports;
    using System.Threading;

    namespace SerialReadTest
    {
        class SerialRead
        {
            static void Main(string[] args)
            {
        Console.WriteLine("Serial read init");
        SerialPort port = new SerialPort("COM6", 115200, Parity.None, 8, StopBits.One);
        port.Open();
        while(true){
          Console.WriteLine(port.ReadLine());
        }

    }
}
}