System.Management: unable to get instance of Msvm_VirtualSystemManagementService

[antonalabin]

.NET 7.0 project created through Template Studio for WinUI
Package: System.Management

Unable to get instance of Msvm_VirtualSystemManagementService: managementObjectCollection contains no objects.

ManagementScope scope = new ManagementScope(@"root\virtualization\v2");
using (ManagementClass managementServiceClass = new ManagementClass("Msvm_VirtualSystemManagementService"))
{
    managementServiceClass.Scope = scope;
    ManagementObjectCollection managementObjectCollection = managementServiceClass.GetInstances();
    if (managementObjectCollection.Count == 0)
    {
        throw new ArgumentException("The collection contains no objects", "collection");
    }
}

[danmoseley]

Can you reduce to simplest standalone repro code? Does it work on .NET Framework?

[danmoseley]

OK, WPF runs its UI on an STA thread, by design. The fix should be fairly simple: make these calls off the main thread thread. Use Task.Run(..) for example.

[stephentoub]

OK, WPF runs its UI on an STA thread, by design. The fix should be fairly simple: make these calls off the main thread thread. Use Task.Run(..) for example.

What's the explanation for "Yes. it works with .NET Framework"?

[antonalabin]

What's the explanation for "Yes. it works with .NET Framework"?

I used a console application with .NET Framework.
Template from Template Studio for WinUI is created only on .NET 7.0.

[antonalabin]

OK, WPF runs its UI on an STA thread, by design. The fix should be fairly simple: make these calls off the main thread thread. Use Task.Run(..) for example.

This does not work.

[danmoseley]

Can you inspect the thread's GetApartmentState()? And compare the working case

[antonalabin]

Problem solved. Required to run as administrator. In the case of WinUI, it is not enough to run Visual Studio with administrator rights and you need to change the project settings.