Where is the domain name in a UserPrincipal object?

Question

I'm using the System.DirectoryServices.ActiveDirectory classes to find all Active Directory users. The code is very simple:

var context = new PrincipalContext(ContextType.Domain);
var searcher = new PrincipalSearcher(new UserPrincipal(context));
var results = searcher.FindAll();

I want to get the domain-qualified username in the "friendly" (aka. "pre-Windows 2000" format), eg. "CONTOSO\SmithJ". UserPrincipal.SamAccountName gives me the username part, but how do I get the domain part? I cannot assume that the domain will be the same as the machine's or current user's domain.

Answer 1

For AD DS, the value of msDS-PrincipalName is the NetBIOS domain name, followed by a backslash ("\").

You can find it using :

/* Retreiving the root domain attributes
 */ 
sFromWhere = "LDAP://DC_DNS_NAME:389/dc=dom,dc=fr"; 
DirectoryEntry deBase = new DirectoryEntry(sFromWhere, "AdminLogin", "PWD"); 

DirectorySearcher dsLookForDomain = new DirectorySearcher(deBase); 
dsLookForDomain.Filter = "(objectClass=*)"; 
dsLookForDomain.SearchScope = SearchScope.base; 
dsLookForDomain.PropertiesToLoad.Add("msDS-PrincipalName"); 

SearchResult srcDomains = dsLookForDomain.FindOne();