Question

In C#, how do i access Active Directory to get the list of groups that a certain user belongs to?

The user details are in the form:

"MYDOMAIN\myuser"

I’ve been following the instructions from here but they only work if i have the user details in the form:

"LDAP://sample.com/CN=MySurname MyFirstname,OU=General,OU=Accounts,DC=sample,DC=com"

So maybe what i’m asking is, how to get from the first, shorter, form to the fully qualified form below?

Thanks a lot!

Answer 1

This might help…

using System.Collections;
using System.DirectoryServices;

/// <summary>
/// Gets the list of AD groups that a user belongs to
/// </summary>
/// <param name="loginName">The login name of the user (domain\login or login)</param>
/// <returns>A comma delimited list of the user's AD groups</returns>
public static SortedList GetADGroups(string loginName)
{
    if (string.IsNullOrEmpty(loginName))
        throw new ArgumentException("The loginName should not be empty");

    SortedList ADGroups = new SortedList();

    int backSlash = loginName.IndexOf("\\");
    string userName = backSlash > 0 ? loginName.Substring(backSlash + 1) : loginName;

    DirectoryEntry directoryEntry = new DirectoryEntry();
    DirectorySearcher directorySearcher = new DirectorySearcher(directoryEntry, "(sAMAccountName=" + userName + ")");

    SearchResult searchResult = directorySearcher.FindOne();
    if (null != searchResult)
    {
        DirectoryEntry userADEntry = new DirectoryEntry(searchResult.Path);

        // Invoke Groups method.
        object userADGroups = userADEntry.Invoke("Groups");
        foreach (object obj in (IEnumerable)userADGroups)
        {
            // Create object for each group.
            DirectoryEntry groupDirectoryEntry = new DirectoryEntry(obj);
            string groupName = groupDirectoryEntry.Name.Replace("cn=", string.Empty);
            groupName = groupName.Replace("CN=", string.Empty);
            if (!ADGroups.ContainsKey(groupName))
                ADGroups.Add(groupName, groupName);
        }
    }

    return ADGroups;
}