C# 讀COM PORT的程式碼詳解

C#  讀COM PORT

參考了MSDN的範例：

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

還是不工作，需要加這行程式碼：

mySerialPort.DtrEnable = true;

DtrEnable屬性的說明：

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

demo程式碼：

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 Action98c455a79ddfebb79781bff588e7b37e 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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