Accessing methods across classes

Question

I want to be able to access methods in my "Uart" class from "AtCommand" class. ie the AT command class sends and receives commands to and from modem via serial port. I an unable to figure out why the methods in Uart are NOT available in "AtCommand" BUT they ARE available if I try to access them from my Main Form.

Here is the code for both classes, note: there are wriggly red lines under GsmPort.Write and warning it is not available in current context (so I assume scope issue).

using System.IO.Ports;
namespace ClassLessons
{
    class Uart
    {
        public bool Connected { get; set; }
        public bool DataInBuffer { get; set; }
        public string RxData;

    SerialPort port = new SerialPort();

    public Uart()
    {
        this.port.PortName = Properties.Settings.Default.PortName;
        this.DataInBuffer = false;
        this.RxData = "";
        this.port.BaudRate = 115200;
        this.port.ReadTimeout = 500;
        this.port.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived);
        Connected = false;
        try
        {
            if (!port.IsOpen)
            {
                port.Open();
                Connected = true;
            }
        }
        catch { }
    }

    private void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        try
        {
            string data = this.port.ReadLine();
            RxData = data;
            DataInBuffer = true;
        }
        catch
        {

        }
    }

    public void Write(string message)
    {
        this.port.WriteLine(message);
    }


}

} }

AND AtCommand :

namespace ClassLessons
{
    class AtCommand
    {
        Uart GsmPort = new Uart();
        GsmPort.Write("Test");
    }
}

Answer 1

Your port field is private:

Change:

SerialPort port = new SerialPort();

To:

public SerialPort port = new SerialPort();

And it will be publicly accessible in other classes.

Answer 2

You're calling GsmPort.Write("Test") outside of a method. You probably want something like:

namespace ClassLessons
{
    class AtCommand
    {
        Uart GsmPort = new Uart();
        public AtCommand()
        {
            GsmPort.Write("Test");
        }
    }
}

Answer 3

您需要同时制作 Uart 和 AtCommand公共课程