C# How to check if certain device is connected in COM port?

Question

I want to make a program that detects if a certain device is connected to a COM port by the device name when a button is clicked. For example, if the device is connected and it shows "HUAWEI Mobile Connect - 3G PC UI Interface (COM16)" in the device manager, say in a message box if the device is connected.

I have a code but it only shows the available COM port.

private void button1_Click(object sender, EventArgs e)
    {
        string[] ports = SerialPort.GetPortNames();

        foreach (string port in ports)
        {
            richTextBox1.Text = port.ToString();
        }
    }

D M · Accepted Answer · 2021-10-28 21:16:06Z

2

If you are fine with using the System.Management NuGet package in Visual Studio, you can use the following bit of code to get your device name.

using (var devices = new ManagementObjectSearcher("SELECT * FROM WIN32_SerialPort"))
{
    string[] portnames = SerialPort.GetPortNames();
    var ports = devices.Get().Cast<ManagementBaseObject>().ToList();
    var device_list = (from n in portnames
                       join p in ports on n equals p["DeviceID"].ToString()
                       select n + " - " + p["Caption"]).ToList();
}

Here, device_list contains the names of all the devices connected to COM. You can search for a particular device by device name.

edited Oct 28, 2021 at 21:16

D M

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answered Apr 1, 2019 at 11:00

Apoorva Raju

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