Bradley L. Foley

A recent requirement came up for a quick bit of code to retrieve the names and e-mail addresses from an ActiveDirectroy group. I did this in code instead of power shell in order to be able to use these methods in further logic.

So here we go….

First we’re going to create a simple structure to represent the user information we need:

        public struct UserInfo
        {
            public string DisplayName;
            public string Mail;
            public string Login;
        }

Next were going to create a simple entry point in which we will use to test our methods:

static void Main(string[] args)
{
    ArrayList ar = GetADGroupUsers("GroupName");

    List<UserInfo> users = new List<UserInfo>();
    foreach (string user in ar)
    {
        users.Add(GetADUserInfo(user));

    }
}

Now we will need to implement the two methods seen above. First the method to get all the users in a group:

static public ArrayList GetADGroupUsers(string groupName)
{
    SearchResult result;
    DirectorySearcher search = new DirectorySearcher();
    search.Filter = String.Format("(cn={0})", groupName);
    search.PropertiesToLoad.Add("member");
    search.PropertiesToLoad.Add("mail");
    search.PropertiesToLoad.Add("samaccountname");
    result = search.FindOne();

    ArrayList userNames = new ArrayList();
    if (result != null)
    {
        for (int counter = 0; counter <
                 result.Properties["member"].Count; counter++)
        {

            userNames.Add((string)result.Properties["member"][counter]);
        }
    }
    return userNames;
}

Now that we have the ArrayList of users, we will need to get the information about the users:

static public UserInfo GetADUserInfo(string userName)
{
    SearchResult result;

    DirectoryEntry de = new DirectoryEntry("LDAP://mydomaincontroller/"+userName);

    UserInfo ui = new UserInfo();
    ui.DisplayName = de.Properties["displayName"].Value.ToString();
    ui.Mail = de.Properties["mail"].Value.ToString();
    ui.Login = de.Properties["sAMAccountName"].Value.ToString();
    return ui;

}

And that’s it, now we have a nice list of users with their email addresses.