C# read only Serial port when data comes

Question

I want read my serial port but only when data comes(I want not polling).

This is how I do it.

                Schnittstelle = new SerialPort(\"COM3\"         


        

Answer 1

You will have to add an eventHandler to the DataReceived event.

Below is an example from msdn.microsoft.com, with some edits: see comments!:

public static void Main()
{
    SerialPort mySerialPort = new SerialPort("COM1");

    mySerialPort.BaudRate = 9600;
    mySerialPort.Parity = Parity.None;
    mySerialPort.StopBits = StopBits.One;
    mySerialPort.DataBits = 8;
    mySerialPort.Handshake = Handshake.None;

    mySerialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);

    mySerialPort.Open();

    Console.WriteLine("Press any key to continue...");
    Console.WriteLine();
    Console.ReadKey();
    mySerialPort.Close();
}

private static void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
    SerialPort sp = (SerialPort)sender;
    string indata = sp.ReadExisting();
    Debug.Print("Data Received:");
    Debug.Print(indata);
}

Everytime data comes in, the DataReceivedHandler will trigger and prints your data to the console. I think you should be able to do this in your code.