Tuesday, March 06, 2012

Finding a UserPrincipal for an email address

I wanted to let users log in to our application using their Windows user name or their email address. In order to achieve this aim, I needed to get hold of a UserPrincipal from the user’s email address so I could then test the password they entered was correct. It took quite a lot of searching to find the relevant code, so I thought I’d post the pertinent part here.

      PrincipalContext context = new PrincipalContext(
        ContextType.Domain, Environment.UserDomainName);
      UserPrincipal user = new UserPrincipal(context);
      user.EmailAddress = "test@test.com";

      // create a principal searcher for running a search operation
      PrincipalSearcher pS = new PrincipalSearcher(user);

      // run the query
      PrincipalSearchResult<Principal> results = pS.FindAll();

      foreach (Principal result in results)
        // do something useful...


Anonymous said...


Anonymous said...

Saved me time. Thank you.

jtpatil said...

This saved me a lot of time. Thanks!

D. Rowe said...

This was really bugging me yesterday. Thank you so much!

Anonymous said...

Thank you!, my "do something useful" was getting the manager name

var dirEntryForUser = result.GetUnderlyingObject() as DirectoryEntry;
if (dirEntryForUser != null)
if (dirEntryForUser.Properties["manager"] != null &&
dirEntryForUser.Properties["manager"].Count > 0)
string mgrDN = dirEntryForUser.Properties["manager"][0].ToString();
UserPrincipal usermanager = UserPrincipal.FindByIdentity(context,