WMI Association Classes

I've been trying for most of the day to determine how to create a WMI Association class using C#. Here's the ONLY reference I found, sheesh!

http://msdn.microsoft.com/en-us/library/system.management.instrumentation.managementreferenceattribute.aspx

This example demonstrates how to use the ManagementReferenceAttribute attribute together with the ManagementQualifierAttribute to create an association WMI class that links two other WMI classes. The example is a decoupled provider that exposes three WMI classes in the root/assoc namespace. The first two classes, NumberPhonetic and NumberLetter, are linked by the last class, LetterPhonetic.
To compile the example, you will need to include references to both System.Management.Instrumentation and System.Configuration.Install. You must run installutil.exe against the resulting executable and ensure that the program is running in order to use the implemented WMI classes.
Copy Codeusing System;
using System.Collections;
using System.Management.Instrumentation;
[assembly: WmiConfiguration("root/assoc", HostingModel = ManagementHostingModel.Decoupled)]
[System.ComponentModel.RunInstaller(true)]
public class TheInstaller : DefaultManagementInstaller
{ }
namespace AssocExample
{
class Program
{
static void Main(string[] args)
{
InstrumentationManager.RegisterType(typeof(NumberPhonetic));
InstrumentationManager.RegisterType(typeof(NumberLetter));
InstrumentationManager.RegisterType(typeof(LetterPhonetic));
Console.WriteLine("Press enter to exit");
Console.ReadLine();
InstrumentationManager.UnregisterType(typeof(NumberPhonetic));
InstrumentationManager.UnregisterType(typeof(NumberLetter));
InstrumentationManager.UnregisterType(typeof(LetterPhonetic));

}
}
[ManagementEntity]
public class NumberPhonetic
{
[ManagementKey]
public int Number;
[ManagementProbe]
public string Name;
[ManagementBind]
public NumberPhonetic(int Number)
{
this.Number = Number;
if(Number == 1)
{
Name = "alpha";
}
else if(Number == 2)
{
Name = "bravo";
}
else
{
throw new InstanceNotFoundException();
}
}
[ManagementEnumerator]
static public IEnumerable EnumerateInstances()
{
for (int i = 1; i < 3; i++)
{
yield return new NumberPhonetic(i);
}
}

}
[ManagementEntity]
public class NumberLetter
{
[ManagementKey]
public int Number;
[ManagementProbe]
public string Letter;
[ManagementBind]
public NumberLetter(int Number)
{
this.Number = Number;
if(Number == 1)
{
Letter = "A";
}
else if(Number == 2)
{
Letter = "B";
}
else
{
throw new InstanceNotFoundException();
}
}
[ManagementEnumerator]
static public IEnumerable EnumerateInstances()
{
for (int i = 1; i < 3; i++)
{
yield return new NumberLetter(i);
}
}
}
[ManagementEntity]
[ManagementQualifier("Association", Flavor = ManagementQualifierFlavors.DisableOverride)]
public class LetterPhonetic
{
[ManagementReference(Type = "NumberLetter")]
[ManagementKey]
public string LetterNumber;
[ManagementReference(Type = "NumberPhonetic")]
[ManagementKey]
public string PhoneticNumber;
[ManagementEnumerator]
static public IEnumerable EnumerateInstances()
{
ArrayList insts = new ArrayList();
for (int i = 1; i < 3; i++)
{
LetterPhonetic inst = new LetterPhonetic();
inst.LetterNumber = "Letter = " + i;
inst.PhoneticNumber = "Phonetic = " + i;
insts.Add(inst);
}
return insts;
}
}
}