GroupPrincipal.GetMembers fails when group (or child group if recursive) contains ForeignSecurityPrincipal

Question

This is not so much a question as information for anyone experiencing the same problem.

The following error occurs:

System.Directory         


        

Answer 1

Sure this is an old thread, but might help someone. I used the below code block the solve the problem. the Principal class exposes a property called StructuralObjectClass which tells you what is the AD Class of that principal. I used this to decide whether the object is a user. The GetMembers(true) recursively searches all nested-members in the groupPrincipal in question.

Hope this helps someone.

    List members = new List();
    foreach (var principal in groupPrincipal.GetMembers(true))
    {
        var type = principal.StructuralObjectClass;
        if (type.Contains("user"))
            members.Add((UserPrincipal)principal);
    }

Thanks, R