How to get Physical device IDs of RFID readers using WMI?

Question

Reading RFID's Physical Device Object Name through Serial Port using WMI in C#

I'm setting up a C# code to read signals from different RFID readers. So, I want to get Physical Device ID to recognize which device is sending which signal. So I'm trying to read device information through WMI which has more than 13xx classes.

code .

ManagementObjectSearcher objSearcher = new ManagementObjectSearcher("Select * From Win32_PnPEntity");
ManagementObjectCollection objCollection = objSearcher.Get();

foreach (ManagementObject obj in objCollection)
{
    string info = "HardwareID : "+obj["HardwareID"];
}

I expected the information of each RFID reader unique physical ID.

Answer 1

HardwareID is a string[] and not a string so to obtain is you have to do something like this

var objSearcher = new ManagementObjectSearcher("Select * From Win32_PnPEntity");
var objCollection = objSearcher.Get();

foreach (var queryObj in objSearcher.Get())
{
    Console.WriteLine("Name {0}" , queryObj["Name"]);
    if (queryObj["HardwareID"] == null)
         Console.WriteLine("HardwareID: {0}", queryObj["HardwareID"]);
    else
    {
         var arrHardwareID = (String[])(queryObj["HardwareID"]);                    
         foreach (var arrValue in arrHardwareID)
         {
             Console.Write("HardwareID: {0}\t", arrValue);
         }
    }
}

Also, you can always use any NuGet package to ease your work like Kexla or ORMi