How to set the directory search filter for UPN in Active Directory

Question

string searchFilter = "(" + obj.MatchingCriteriaAttributeName + " = " + MatchingCriteriaAttributeValue + ")";

which set as (userPrincipalName=a@domainname)

passed in

        public bool UserExists(string username, string password, string searchRootpath, string searchFilter,string objectGuid,out string dnName)
        {
            dnName = null;
            string sAccount = username.Replace(@"NOA\", "");
            // Get root of directory entry given credentials and search root           
            using (DirectoryEntry rootDomaintoStart = searchRootpath == null ? new DirectoryEntry(GetCurrentDomainPath()) : new DirectoryEntry(searchRootpath, username, password))
            {
                // Create new instance of directory searcher with directory entry root
                DirectorySearcher search = new DirectorySearcher(rootDomaintoStart);
                // search.Filter = "(SAMAccountName=" + sAccount + ")";
                //if (!string.IsNullOrEmpty(objectGuid))
               search.Filter = searchFilter;
                //else
                SearchResult result;
                //  global.MessageBox.Show(deSearch.Filter.ToString());
                try
                {
                   result = search.FindOne();
                }
                catch (Exception)
                {

                    throw;
                }
                

                if (null == result)
                {
                    dnName = null;
                    return false;
                }

Answer 1

Hello there,

Found this script online which is used to set the directory search filter for UPN in Active Directory.

public String findUserByUPN( LdapContext ctx, String username )
{
   // Domain name should be in DC=your,DC=domain,DC=com format
   String domain = "DC=demo,DC=com";
   String filter = "(userPrincipalName=" + username + ")" ;
   NamingEnumeration<SearchResult> results = ctx.search( domain, filter, null );
   while ( results.hasMore() )
   {
       SearchResult result = results.next();
       // If you get a result here, the user was found
       return result.getNameInNamespace();
   }
   return null;
}

Hope this resolves your Query !!

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