c# - How to get all available PNPClass names from WMI

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Learn more about Teams Listing 111 setup classes. XboxComposite : Xbox Peripherals RemotePosDevice : POS Remote Device DigitalMediaDevices : Digital Media Devices PrintQueue : Print queues

So from that I can see there are 111 setup classes. However, when I query for Win32_PnPEntity :

var query = new ManagementObjectSearcher("SELECT * FROM Win32_PnPEntity");
var results = query.Get();
var set = new HashSet<string>();
foreach(var device in results)
    var className = (string)device.GetPropertyValue("PNPClass");
    set.Add(className)
var count = set.Count; // 25 <---- not 111
I get 25, not 111. So My query is clearly a subset of what's actually available to the machine which makes sense. The classes that output from devcon classes line up with the PNPClass property value, so I assume they are the same.
So there must be a way to fetch all the available PNPClass's unless devcon.exe just hardcodes that list it outputs with devcon classes
I would like to generate this list myself programmatically, not invoking devcon classes as a subprocess and parsing it's output.
Unfortunately, Win32_PNPEntity doesn't map exactly to the data you would get from devcon.  Devcon gives you all the available classes on the system including System, filter, PNP, etc.  Win32_PNPEntity is just the plug and play devices.  Win32_PNPEntity data also depends on what hardware is currently connected.
devcon is outputting all the data from the subkeys in  "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class" where there is no name/value called NoUseClass=1.  It's displaying the Class and ClassDesc values.  The ClassDesc value could be either a literal string, a reference to a value in a .inf or a reference from a dll so outputting that info would take some work.
What are you trying to do with that data?  Maybe there is another way you can get the info you need?  If you are just trying to get the class info for connected PNP devices then your existing code should get the info you need.
                Ah, ok so that answers it for me. I just need to do a kind of health check on a plugged in device. "is it there, and if so is it ok" and provide a browser to grab the DeviceID to check.  What Win32_PNPEntity provides will work. I just wanted to be sure I was not missing something.
– AJ Venturella
                Nov 29, 2018 at 15:32
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