C# realizes reading USB to serial port parameters and displaying them in ComboBox

Automatic detection and reading of serial port parameters is a very useful feature in many applications, especially those that require communication with external hardware. In this article, we will discuss how to implement this functionality in C#, with the focus on how to automatically identify devices converted to serial ports via USB and display their parameters in ComboBox of Windows Forms application.

Steps Overview

Get a list of available serial ports.

Fill in ComboBox control.

Read and display the parameters of the selected serial port.

Development Environment

Language: C#

Framework: .NET Framework

IDE：Visual Studio

Implementation steps

Step 1: Create forms and controls

First, we need to create a new Windows Forms application in Visual Studio. Add the following controls to the main form:

• ComboBox (named comboBoxPorts)
• Label (used to display serial port parameters, such as labelBaudRate, labelDataBits, etc.)

Step 2: Write code

Next, let's dig into the details of the code implementation.

using System;
using ;
using ;

public partial class MainForm : Form
{
    public MainForm()
    {
        InitializeComponent();
        LoadSerialPortNames();
    }

    private void LoadSerialPortNames()
    {
        ();
        string[] portNames = ();
        foreach (var portName in portNames)
        {
            (portName);
        }
    }

    private void comboBoxPorts_SelectedIndexChanged(object sender, EventArgs e)
    {
        if ( != null)
        {
            string selectedPort = ();
            using (SerialPort port = new SerialPort(selectedPort))
            {
                try
                {
                    ();
                    DisplayPortParameters(port);
                }
                catch (Exception ex)
                {
                    ("Error: " + );
                }
            }
        }
    }

    private void DisplayPortParameters(SerialPort port)
    {
         = "Baud Rate: " + ();
         = "Data Bits: " + 

();
         = "Stop Bits: " + ();
         = "Parity: " + ();
    }
}

(Some code)

In, make sure the ComboBox and Label controls are configured correctly. Here is a sample code snippet for these control configurations:

private void InitializeComponent()
{
     = new ();
     = new ();
    // ... Initialization of other controls ...
    // 
    // comboBoxPorts
    // 
     = ;
     = true;
     = new (12, 12);
     = "comboBoxPorts";
     = new (121, 21);
     = 0;
     += new (this.comboBoxPorts_SelectedIndexChanged);

    // 
    // labelBaudRate
    // 
     = true;
     = new (12, 36);
     = "labelBaudRate";
     = new (68, 13);
     = 1;
     = "Baud Rate:";

    // ... Configuration of other controls ...}

Step 3: Run and Test

Compile and run the application. After the program starts, ComboBox will list all available serial ports. Select a serial port and the application will try to open the serial port and display its parameters in the Label control.

in conclusion

In this article, we introduce how to read the parameters of USB to serial port in C# and display these parameters using the ComboBox control in Windows Forms application. This approach is very useful in applications that require interaction with various hardware devices, especially in serial communication.

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