读取串口时抛出IO操作中止错误(IO operation aborted error thrown while reading serial port)

 我们正在尝试使用.Net串口类读取连接到串行端口的外部设备（本例中为称重秤）写入的数据。 
 
 首先我们初始化串口如下： 
 
InitializeSerialPort()
{
   if ((serialPort != null) && (serialPort.IsOpen))
        {
            serialPort.Close();
            serialPort.Dispose();
            serialPort = null;
        }

        serialPort = new SerialPort("COM2", 9600, Parity.None, 8,
                                    StopBits.One) { Handshake = Handshake.None };
        serialPort.DataReceived += serialPort_DataReceived;
        serialPort.NewLine = "\r";
}
 
 我们使用后台工作线程通过在串行端口上发送命令（由称重秤理解）来连续轮询设备。 一旦我们发送命令，连接到串行端口的设备就会响应响应输出。 我们调用SerialPort类的ReadLine API来获取设备在DataReceived事件中写入的串行端口上的数据，如下面的代码片段所示： 
 
private void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
    try
        {
            data = serialPort.ReadLine();
        }
        catch(System.IO.IOException ex)
        {
            //since serial port reading threw an error so there is no value to be parsed hence exit the function.
            return;
        }
//if no error then parse the data received
}
 
 我正在使用.Net framework 4.0的System.IO.Ports.SerialPort类。 我可以看到很多人在其他论坛上发布此问题，但没有具体的解决方案。 他们中的一些人将.Net串口类称为bug，至今尚未由Microsoft修复。 提到此错误的论坛之一就在这里 
 
 我也试过这里发布的解决方案，但没有任何帮助。 如果任何其他人遇到此问题或其解决方案，我需要一些输入。 

We are trying to read data written by an external device (weighing scale in this case) connected to serial port using .Net serial port class. 
 
First we initialize the serial port as below:
 
InitializeSerialPort()
{
   if ((serialPort != null) && (serialPort.IsOpen))
        {
            serialPort.Close();
            serialPort.Dispose();
            serialPort = null;
        }

        serialPort = new SerialPort("COM2", 9600, Parity.None, 8,
                                    StopBits.One) { Handshake = Handshake.None };
        serialPort.DataReceived += serialPort_DataReceived;
        serialPort.NewLine = "\r";
}
 
We are using background worker thread to poll the device on continuous interval by sending a command(understood by the weighing scale) on the serial port. As soon as we send the command the device connected to serial port reacts with a response output. We call ReadLine API of SerialPort class to get the data present on the serial port written by the device in the DataReceived event as shown in the code snippet below :
 
private void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
    try
        {
            data = serialPort.ReadLine();
        }
        catch(System.IO.IOException ex)
        {
            //since serial port reading threw an error so there is no value to be parsed hence exit the function.
            return;
        }
//if no error then parse the data received
}
 
I'm using System.IO.Ports.SerialPort class of .Net framework 4.0. I can see a number of people posting this issue on other forums but with no specific resolution. Some of them terming .Net Serial port class as buggy which has not been fixed by Microsoft till date. One of the forums where this error is mentioned is here
 
I also tried the solution posted here but of no help. I need some input if any one else has come across this issue or its resolution.

原文：https://stackoverflow.com/questions/21305392