How can I find out a COM port number of a bluetooth device in c#?

Question

My company developed a device that communicates with a PC via Bluetooth using a virtual COM port.

Now we need a user to pair a device with a PC (MS Windows OS) firs

Answer 1

    private static string FindSerialPortForRFIDReaderCore()
    {
        string serialPort = "";

        List ports = new List();

        System.Management.ManagementObjectSearcher Searcher = new System.Management.ManagementObjectSearcher("Select * from WIN32_SerialPort");

        foreach (System.Management.ManagementObject Port in Searcher.Get())
        {
            if (Port["PNPDeviceID"].ToString().ToUpper().Contains("MacAddress")) 
                ports.Add(Port["DeviceID"].ToString());
        }

        if (ports.Count > 1) // There are more than one Serial Ports created for the bluetooth device.
            serialPort = ports.OrderByDescending(p => p).FirstOrDefault();
        else if(ports.Count == 1)
            serialPort = ports[0];


        return serialPort;
    }