Question

I’m querying our Active Directory with the following code:

            using (DirectorySearcher search = new DirectorySearcher(de))
            {
                search.PropertiesToLoad.Add("cn");
                search.PropertiesToLoad.Add("employeeid");
                search.PropertiesToLoad.Add("employeenumber");
                search.PropertiesToLoad.Add("distinguishedname");
                search.PropertiesToLoad.Add("mail");
                search.Filter = @"(&(objectClass=user)(employeeid=*)(employeenumber=*))";
                search.PageSize = 3000;

                SearchResultCollection src = search.FindAll();
                foreach (SearchResult rec in src)
                {
                    yield return new ADUser()
                    {
                        Name = rec.Properties["cn"][0].ToString(),
                        Path = rec.Properties["distinguishedname"][0].ToString(),
                        Acctno = rec.Properties["employeeid"][0].ToString(),
                        Personno = rec.Properties["employeenumber"][0].ToString(),
                        Email = rec.Properties["mail"][0].ToString()
                    };
                }

            }

As you can see, I’m trying to convert the results into an IEnumerable list of ADUser (my own class defined like this):

    public class ADUser
    {
        public string Name { get; set; }
        public string Path { get; set; }
        public string Acctno { get; set; }
        public string Personno { get; set; }
        public string Email { get; set; }
    }

However, my code crashes anytime I hit a user who does not have an email entry. It seems as though the SearchResult does not contain a property for mail when the user has no email. Is there a way to get the result to return the property with a null or empty value instead?

Thanks for your help.

Answer 1

Edit after comment:

if (rec.Properties.Contains("mail") && rec.Properties["mail"] != null)
{
  Email = rec.Properties["mail"][0].ToString()
}
else
{
   Email = "No mail"; # or Email = ""; if you want no text returned 

}