Accessing nested Win32/CIM Classes, using System.Management namesp

microsoft.public.dotnet.framework

20 Jun 2006 1:52 AM

Alex

This is a general question, but one that I have encountered in many different
projects.

When trying to access a nested class using the
ManagementBaseObject.GetPropertyValue("PropertyName") method my programs
always throw exceptions. I have also tried using the Indexer
ManagementBaseObject["PropertyName"] and the same exception is raised.

Here's an example of what I am trying to do:

//Display the "Name" of a CIM_LogicalDevice class which is nested in a
Win32_USBControllerDevice class
((ManagementBaseObject)usbConDev.GetPropertyValue("Dependent")).GetPropertyValue("Name").ToString();

The line above will cause an exception every time... I realize a lot is
happening in one line, but you should be able to break it up into seperate
shorter lines if you like.

My problem is that GetPropertyValue & the Indexer both have a return type of
"object". When trying to cast the returned object to a
"ManagementBaseObject", "int" or anything else other than a string I get
exceptions.

Does anyone know a way around this?

I tried using the GetType() method but it seemed to always return a
"System.string"

Any help would be greatly appreciated!!

Alex