Question

I would like to read information from a device connected to a SerialPort. I did this previously using a form (code below) but I am trying to do it without one, just storing the information into an array of string.

Code used with a form:

private void serialPort1_DataReceived(object sender,  System.IO.Ports.SerialDataReceivedEventArgs e)
            {
                string line = port.ReadExisting();              
                this.BeginInvoke(new LineReceivedEvent(LineReceived), line);
            }

        private delegate void LineReceivedEvent(string line);
        private void LineReceived(string line)
        {
            textBox3.AppendText(line);
        }

How far i got without a form (the DA method is allows to store variables within the program). I get the following error on the last line Cannot implicitly convert type 'string' to 'System.IO.Ports.SerialDataReceivedEventHandler'.

protected override void SolveInstance(IGH_DataAccess DA)
  {
    string selectedportname;
    DA.GetData(1, ref selectedportname);
    int selectedbaudrate;
    DA.GetData(2, ref selectedbaudrate);
    bool connecttodevice;
    DA.GetData(3, ref connecttodevice);
    bool sendtoprint;
    DA.GetData(3, ref sendtoprint);


    port = new SerialPort(selectedportname, selectedbaudrate, Parity.None, 8, StopBits.One); //Create the serial port
    port.DtrEnable = true;   //enables the Data Terminal Ready (DTR) signal during serial communication (Handshaking)
    port.Open();             //Open the port
    port.DataReceived += port.ReadExisting();                                             

  }

Answer 1

Assuming ReadExisting is a method with the right parameters:

//port.DataReceived += port.ReadExisting();   
  port.DataReceived += port.ReadExisting;   

But the error indicates it is returning a ‘string’ so there is more to solve here.

Edit:

Looks like it should be:

  port.DataReceived += this.serialPort1_DataReceived;