LDAP Connection to AD and search on all User in all OUs

Question

Im using the Code from: How can I get a list of users from active directory? to get all User from my AD.

Now im trying to connect via LDAP to a Domain to get all Users from that Active Directory with the following changes:

using (PrincipalContext context = new PrincipalContext(ContextType.Domain, "192.168.1.100", "Username@testdomain.local", "Password"))

There are 2 different OUs at testdomain.local with Users but Im only getting the Users of one OU? I thought that gives me all Users from all OUs from AD?

If I use the following for my current AD Domain then I get all USers from all OUs?

using (PrincipalContext context = new PrincipalContext(ContextType.Domain, currentDomain))

Could that be a configuration problem on the other domain or is the Code not working with a LDAP Connection?

Thank you

UPDATE:

Code:

using (PrincipalContext context = new PrincipalContext(ContextType.Domain, "192.168.1.100", "Username@testdomain.local", "Password"))
{
    using (PrincipalSearcher searcher = new PrincipalSearcher(new UserPrincipal(context)))
    {
        foreach (var result in searcher.FindAll())
        {
            DirectoryEntry de = result.GetUnderlyingObject() as DirectoryEntry;
            de.Properties["samAccountName"].Value
        }
        catch (Exception c)
        {
        }
        result.Dispose();
    }
}

Answer 1

The code you have above works fine and pull all the records without any errors or skips. I would recommend changing the domain name from IP address to testdomain.local and username without @testdomain.local.

If you are looking to get samAccountName, or other properties, and convert them to DirectoryEntry, I would recommend the following route that uses DirectorySearcher. It provides better performance and looks up in all OUs.

DirectoryEntry entry = new DirectoryEntry("LDAP://DC=testdomain,DC=local", "username", "password");
string searchQuery = $"(&(objectCategory=user)(objectClass=user))";

var listOfUsers = new List<string>();
DirectorySearcher ds = new DirectorySearcher(entry, searchQuery,
                            new string[] { "samAccountName" });
ds.SizeLimit = int.MaxValue;
ds.PageSize = int.MaxValue;
foreach (SearchResult user in ds.FindAll())
{
    string samAccountName = user.Properties["samAccountName"][0].ToString();
    Console.WriteLine(samAccountName);
    listOfUsers.Add(samAccountName);
}