C# 讀COM PORT的代碼詳解

C# 讀COM PORT

參照了MSDN的樣本：

https://msdn.microsoft.com/en-us/library/system.io.ports.serialport.aspx

還是不工作，需要加這一行代碼：

mySerialPort.DtrEnable = true;

DtrEnable屬性的描述：

Gets or sets a value that enables the Data Terminal Ready (DTR) signal during serial communication.

demo代碼：

public class COMPortListener    {        private static ILog logger = LogManager.GetLogger(typeof (COMPortListener));            #region single instance        private COMPortListener()                {        }                static COMPortListener()                {        }                private static COMPortListener _instance = new COMPortListener();                public static COMPortListener Instance { get { return _instance; } }                 #endregion        public Action<string> OnDataReceived;                public void SerialPortListenAsync()                {                    if (OnDataReceived == null)            {                            throw new InvalidOperationException("must set callback [OnDataReceived] first.");            }            Task.Run(() =>            {                            var mySerialPort = new SerialPort(ConfigurationManager.AppSettings["COM_PORT"]);                mySerialPort.BaudRate = 9600;                mySerialPort.Parity = Parity.None;                mySerialPort.StopBits = StopBits.One;                mySerialPort.DataBits = 8;                mySerialPort.Handshake = Handshake.None;                mySerialPort.RtsEnable = true;                mySerialPort.DtrEnable = true;                mySerialPort.ReadTimeout = 500;                mySerialPort.ErrorReceived += (sender, args) =>                {                    Console.WriteLine("######error");                    Console.WriteLine(args.EventType);                };                mySerialPort.Open();                logger.Info("####COM PORT opened...");                                while (true)                {                                    try                    {                                            string message = mySerialPort.ReadLine();                        OnDataReceived(message);                        Task.Delay(500);                    }                                        catch (TimeoutException ex)                    {                                            //do nothing                    }                }            });        }    }

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