Get all users in localgroup using DirectoryEntry LINQ C#

Question

I am trying to wrap my head around LINQ, so I can figure out how to query the DirectoryEntry. At the moment I am trying to write some code in C# that will take a string variable and gave a list of member within a group based upon this string.

Below is what I have managed to figure out so far

public static string[] GetAllUsersInGroup(string groupname)
{
    var names = new List<string>();
    var path = string.Format("WinNT://{0},computer", Environment.MachineName);
    var computerEntry = new DirectoryEntry(path);

    if (computerEntry != null)
    {
        using (computerEntry)
        {
            var menberNames = from DirectoryEntry childEntry
                                in computerEntry.Children.Find("testgroup", "group")
                              where childEntry.SchemaClassName == "User"
                              select childEntry.Name;

            foreach (var name in memberNames)
            {
                names.Add(name);
            }
        }
    }

    return names.ToArray();
}

The problem with this is that I can't use Children.Find() in the where statement.

Although I would like to know how to do this correctly, I really want to be able to figure this out, since there are other queries I need to do. So if anyone know of any GOOD source to find this info please let me know

@PaulAlanTaylor I can't use Children.Find() is the where because it is not a boolean ie if I had something I where childEntry.SchemaClassName == "User" this would work to return all users in the Computer — Sam Stephenson
– Sam Stephenson, Commented Sep 26, 2012 at 10:20

Jan P. · Accepted Answer · 2012-09-26 10:23:52Z

1

I am not really sure about this. Try if it works for you.

public static string[] GetAllUsersInGroup(string groupname)
{
    var path = string.Format("WinNT://{0},computer", Environment.MachineName);

    using (var computerEntry = new DirectoryEntry(path))
    {
        if (computerEntry != null)
        {
            return
                computerEntry.Children.SelectMany(childEntry => 
                    ChildEntry.Children.Find("Administrators", "group")
                        .Children.Select(child => child.Name))
                    .ToArray();
        }
        else 
        {
            return null;
        }
    }
}

answered Sep 26, 2012 at 10:23

Jan P.

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5 Comments

Jan P. Over a year ago

You can't do this more LINQy without loosing security

Sam Stephenson Over a year ago

SelectMany is not a property of Children

Cody Over a year ago

I have the same issue as @SamStephenson. I cant call any LINQ methods on computerEntry.Children.

Jan P. Over a year ago

@Cody You got using System.Linq; within your document head? :P

Cody Over a year ago

@jaydotnet yup. The problem was that Children is an IEnumerable, but not the generic kind, IEnumerable<T>. I had to use Children.OfType<DirectoryEntry>().

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