检查 AD 中是否存在已完成的列公司

Question

请告诉我如何检查用户是否填写了组织字段

我正在 MVC 5 上制作电话簿。有一个模型和一个控制器。

型号

     public class Person
    {
        public string DisplayName { get; set; }
        public string Office { get; set; }
        public string PhoneNumber { get; set; }
        public string ExtensionPhoneNumber { get; set; }
        public string Email { get; set; }
        public string Department { get; set; }
        //public string Title { get; set; }
        public int DepartmentNumber { get; set; }
        public string Subdivision { get; set; }
        public string Manager { get; set; }
        public string Mobile { get; set; }
        public int EmployeeNumber { get; set; }
    }

控制器

using System.DirectoryServices;
using System.DirectoryServices.AccountManagement;

 public class PeopleController : Controller
    {
        public ActionResult Home(string department)
        {
            IEnumerable<Person> persons = GetPeople();
            return View(persons);
        }

        public static List<Person> GetPeople()
        {

            List<Person> people = new List<Person>();

            var path = new PrincipalContext(ContextType.Domain, "RCSON.local", "OU=RCSON, DC=RCSON, DC=local");

            UserPrincipal user = new UserPrincipal(path);
            user.Enabled = true;

            //user.Name = "*";
            //user.VoiceTelephoneNumber = "*";
            //user.EmailAddress = "*";
            //user.Description = "";
            
            var search = new System.DirectoryServices.AccountManagement.PrincipalSearcher();
            search.QueryFilter = user;
            var results = search.FindAll();
            foreach (UserPrincipal item in results)
            {
                var directoryEntry = item.GetUnderlyingObject() as DirectoryEntry;

                people.Add(new Person
                {
                    DisplayName = item.Name,
                    PhoneNumber = item.VoiceTelephoneNumber,
                    ExtensionPhoneNumber = item.VoiceTelephoneNumber,
                    Email = item.EmailAddress,
                    Office = directoryEntry.Properties["physicalDeliveryOfficeName"].Value as string,
                    Department = directoryEntry.Properties["subdivision"].Value as string,
                    //Title = directoryEntry.Properties["title"].Value as string,
                    DepartmentNumber = Convert.ToInt32(directoryEntry.Properties["departmentNumber"].Value),
                    Subdivision = directoryEntry.Properties["department"].Value as string,
                    Manager = directoryEntry.Properties["manager"].Value as string,
                    Mobile = directoryEntry.Properties["mobile"].Value as string,
                    EmployeeNumber = Convert.ToInt32(directoryEntry.Properties["employeeNumber"].Value)
                });
            }
            return people;
        }
}

[在此处输入图片描述][1] [1]：https://i.stack.imgur.com/kv2vh.jpg

如何过滤具有组织名称的用户。