Get a list of members of a WinNT group

Question

There are a couple of questions similar to this on stack overflow but not quite the same.

I want to open, or create, a local group on a win xp computer and add members to it, domain, local and well known accounts. I also want to check whether a user is already a member so that I don't add the same account twice, and presumably get an exception.

So far I started using the DirectoryEntry object with the WinNT:// provider. This is going ok but I'm stuck on how to get a list of members of a group?

Anyone know how to do this? Or provide a better solution than using DirectoryEntry?

Answer 1

Okay, it's taken a while, messing around with different solutions but the one that fits best with my original question is given below. I can't get the DirectoryEntry object to access the members of a local group using the 'standard' methods, the only way I could get it to enumerate the members was by using the Invoke method to call the native objects Members method.

 using(DirectoryEntry groupEntry = new DirectoryEntry("WinNT://./Administrators,group")) {     foreach(object member in (IEnumerable) groupEntry.Invoke("Members"))     {         using(DirectoryEntry memberEntry = new DirectoryEntry(member))         {             Console.WriteLine(memberEntry.Path);         }     } } 

I also used a similar technique to add and remove members from the local group.

Hopefully this helps someone else as well. Keith.

EDIT by Tim: added VB.Net version

Public Function MembersOfGroup(ByVal GroupName As String) As List(Of DirectoryEntry)     Dim members As New List(Of DirectoryEntry)     Try         Using search As New DirectoryEntry("WinNT://./" & GroupName & ",group")             For Each member As Object In DirectCast(search.Invoke("Members"), IEnumerable)                 Dim memberEntry As New DirectoryEntry(member)                 members.Add(memberEntry)             Next         End Using     Catch ex As Exception         MessageBox.Show(ex.ToString)     End Try     Return members End Function