com - How do I instantiate CorRuntimeHost from mscoree.tlb in PowerShell? -

i want enumerate appdomains in current process powershell. process happens visual studio, hosting studioshell. need instantiate corruntimhost, part of mscoree.tlb, can adapt this c# code..

i tried proper name of corruntimehost , pass new-object -comobject "objectname". based on this forum posting, searched registry , think correct name clrmetadata.corruntimehost. however, while new-object -comobject 'clrmetadata.corruntimehost' -strict return object, exposes methods intrinsic com object.

based on this stackoverflow question tried [activator]::createinstance(). however, following 2 statements give me same problem new-object, namely can't call icorruntimehost::enumdomains() method.

$corruntimehost = [activator]::createinstance([type]::gettypefromprogid('clrmetadata.corruntimehost')); $enumerator = $null; $corruntimehost.enumdomains([ref]$enumerator);  method invocation failed because [system.__comobject] doesn't contain method named 'enumdomains'. @ line:1 char:1 + $corruntimehost.enumdomains([ref]$enumerator) + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~     + categoryinfo          : invalidoperation: (:) [], runtimeexception     + fullyqualifiederrorid : methodnotfound 

to working in powershell 3.0 ended having use assemblybuilder. below working code:

the problem seems there no public constructor mscoree.corruntimehostclass in .net 4.0 there in 3.5.

i later tested on windows 7 vm powershell 2.0 , code work in powershell 2.0 , 3.0.

$tlbname = split-path -parent ([appdomain]::currentdomain.getassemblies() | { $_.location -match '\\mscorlib.dll$' }).location  $tlbname = join-path $tlbname 'mscoree.tlb';  $csharpstring = @" //adapted here http://blog.semanticsworks.com/2008/04/enumerating-appdomains.html using system; using system.collections.generic; using system.reflection; using system.reflection.emit; using system.runtime.interopservices;  public class listprocessappdomains {      [dllimport( `"oleaut32.dll`", charset = charset.unicode, preservesig = false )]     private static extern void loadtypelibex         (string strtypelibname, regkind regkind,           [marshalas( unmanagedtype.interface )] out object typelib);      private enum regkind     {         default = 0,         register = 1,         none = 2     }      private class conversioneventhandler : itypelibimporternotifysink     {         public void reportevent( importereventkind eventkind, int eventcode, string eventmsg )         {             console.error.writeline("kind: {0} code: {1} message");         }          public assembly resolveref( object typelib )         {             string stacktrace = system.environment.stacktrace;             console.writeline("resolveref ({0})", typelib);             console.writeline(stacktrace);           return null;          }         }      public static assemblybuilder loadmscoreedll( ref object typelib ) {         conversioneventhandler eventhandler = new conversioneventhandler();         string assemblyname = "poshcomwrapper.dll";         loadtypelibex( @"$($tlbname)", regkind.none, out typelib );          typelibconverter typelibconverter = new typelibconverter();         return typelibconverter.converttypelibtoassembly( typelib, assemblyname, 0, eventhandler, null, null, null, null );     } } "@  # can run scipt multiple times try { [listprocessappdomains] } catch {  add-type -typedefinition $csharpstring }  function get-appdomain {     $typelib = $null;     $assemblybuilder = [listprocessappdomains]::loadmscoreedll([ref] $typelib)     $corruntimehostclass = $assemblybuilder.createinstance('poshcomwrapper.corruntimehostclass')     $enumhandle = [intptr]::zero     $corruntimehostclass.enumdomains([ref] $enumhandle);     $appdomain = $null;         {         $corruntimehostclass.nextdomain($enumhandle, [ref] $appdomain);         if ($appdomain -ne $null -and $appdomain.gettype() -eq [appdomain]) { $appdomain; }     } while ($appdomain -ne $null) }  get-appdomain