Powershell Command in C#

Along the lines of Keith's approach

using System;using System.Management.Automation;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            var script = @"                 Get-WmiObject -list -namespace root\cimv2 | Foreach {$_.Name}            ";            var powerShell = PowerShell.Create();            powerShell.AddScript(script);            foreach (var className in powerShell.Invoke())            {                Console.WriteLine(className);            }        }    }}

I'm not sure why you mentioned PowerShell; you can do this in pure C# and WMI (the System.Management namespace, that is).

To get a list of all WMI classes, use the SELECT * FROM Meta_Class query:

using System.Management;...try{    EnumerationOptions options = new EnumerationOptions();    options.ReturnImmediately = true;    options.Rewindable = false;    ManagementObjectSearcher searcher =        new ManagementObjectSearcher("root\\cimv2", "SELECT * FROM Meta_Class", options);    ManagementObjectCollection classes = searcher.Get();    foreach (ManagementClass cls in classes)    {        Console.WriteLine(cls.ClassPath.ClassName);    }}catch (ManagementException exception){    Console.WriteLine(exception.Message);}

Personally I would go with Helen's approach and eliminate taking a dependency on PowerShell. That said, here's how you would code this in C# to use PowerShell to retrieve the desired info:

using System;using System.Collections.Generic;using System.Collections.ObjectModel;using System.Linq;using System.Management.Automation;namespace RunspaceInvokeExp{    class Program    {        static void Main()        {            using (var invoker = new RunspaceInvoke())            {                string command = @"Get-WmiObject -list -namespace root\cimv2" +                                  " | Foreach {$_.Name}";                Collection<PSObject> results = invoker.Invoke(command);                var classNames = results.Select(ps => (string)ps.BaseObject);                foreach (var name in classNames)                {                    Console.WriteLine(name);                }            }        }    }}