C#无法在LDAP中加载权限用户属性

using System;
using System.DirectoryServices;

class Program
{
    static void Main(string[] args)
    {
        string ldapPath = "LDAP://your-ldap-server";

        using (DirectoryEntry entry = new DirectoryEntry(ldapPath))
        {
            using (DirectorySearcher searcher = new DirectorySearcher(entry))
            {
                searcher.Filter = "(objectClass=user)";

                // 添加要加载的属性，这里以"memberOf"为例
                searcher.PropertiesToLoad.Add("memberOf");

                SearchResultCollection results = searcher.FindAll();

                foreach (SearchResult result in results)
                {
                    // 获取权限用户属性值
                    if (result.Properties.Contains("memberOf"))
                    {
                        foreach (string value in result.Properties["memberOf"])
                        {
                            Console.WriteLine(value);
                        }
                    }
                }
            }
        }
    }
}