Find Users e-mail based on the current IPrincipal

Question

I am using Windows Authentication in an ASP.net MVC application. I would like to query Active Directory to get a users e-mail address based on the current user:

IPrincipal principal = HttpContext.Current.User;

Is there a way I can use Active Directory to query for their e-mail address?

Answer 1

using (var context = new PrincipalContext(ContextType.Domain)) {
  using (var user = UserPrincipal.FindByIdentity(context, userName)) {
    if (user != null) {
       return user.EmailAddress;
    }
  }
}