How to get domain user information from Active Directory in C#

jpinquie — Wed, 06 Feb 2008 11:07:00 GMT

First, we have to know the user connection name (here from an ASP.NET page).

string principal = this.Context.User.Identity.Name;

Then we have to define some stuff :

string filter = string.Format("(&(ObjectClass={0})(sAMAccountName={1}))", "person", principal);

string domain = "DOMAIN";

string[] properties = new string[] { "fullname" };

To search in Active Directory, we need the following objects :

DirectoryEntry adRoot = new DirectoryEntry("LDAP://" + domain, null, null, AuthenticationTypes.Secure);

DirectorySearcher searcher = new DirectorySearcher(adRoot);

searcher.SearchScope = SearchScope.Subtree;

searcher.ReferralChasing = ReferralChasingOption.All;

searcher.PropertiesToLoad.AddRange(properties);

searcher.Filter = filter;

SearchResult result = searcher.FindOne();

DirectoryEntry directoryEntry = result.GetDirectoryEntry();

Finally, once information is retrieved in the DirectoryEntry object, we can get the details of each property defined.

string displayName = directoryEntry.Properties["displayName"][0].ToString();

string firstName = directoryEntry.Properties["givenName"][0].ToString();

string lastName = directoryEntry.Properties["sn"][0].ToString();

string email = directoryEntry.Properties["mail"][0].ToString();

Julien Pinquié : c#