Error in using WMI to catch logical drives events

Hi everyone, I'm trying to catch Win32 events to detect plugged in drives such as usb and external hard disks. I've imported the System.Management.dll from C:\Windows\Microsoft.NET\Framework64\v4.0.30319\ and then wrote the script like this

Code (CSharp):

1.  var watcher = new ManagementEventWatcher();
2. var query = new WqlEventQuery("SELECT * FROM Win32_VolumeChangeEvent");
3. watcher.EventArrived += (s, e) =>
4. {
5.          //log event properties
6. };
7. watcher.Query = query;
8. watcher.Start();

However, this raises an error when the thread starts:

Code (CSharp):

1.  NullReferenceException: Object reference not set to an instance of an object
2. System.Management.ThreadDispatch.Start () (at <a2edda3557ef4ca8b6e3156a8719c2a2>:0)
3. System.Management.ManagementScope.Initialize () (at <a2edda3557ef4ca8b6e3156a8719c2a2>:0)
4. System.Management.ManagementObjectSearcher.Initialize () (at <a2edda3557ef4ca8b6e3156a8719c2a2>:0)
5. System.Management.ManagementObjectSearcher.Get () (at <a2edda3557ef4ca8b6e3156a8719c2a2>:0)

Does anyone have any experience with this? The same code works when inside a simple console application or inside a windows service

 

2 years later and I'm still having this exact same issue... I would love to know if this is just an engine limitation or not.

 

After another 2 years, I also encountered this problem, but in a slightly different use case:

Code (CSharp):

1.  
2.         ManagementObjectSearcher searcher =
3.         new ManagementObjectSearcher("root\\CIMV2",
4.         "SELECT * FROM Win32_PnPEntity");
5.         foreach ( ManagementObject queryObj in searcher.Get( ) ) {
6.             Debug.Log( $"Device id: {queryObj[ "DeviceID" ]}\nPNPDeviceID: {queryObj[ "PNPDeviceID" ]}\nName: {queryObj[ "Name" ]}" );
7.         }