c#检查一个组的用户成员？

using System;
using System.DirectoryServices;

public class GroupMemberChecker
{
    public static bool IsUserMemberOfGroup(string username, string groupName)
    {
        try
        {
            using (DirectoryEntry entry = new DirectoryEntry())
            {
                entry.Path = "LDAP://<your_domain_controller>"; // 替换为你的域控制器地址
                entry.Username = "<your_username>"; // 替换为你的用户名
                entry.Password = "<your_password>"; // 替换为你的密码

                using (DirectorySearcher searcher = new DirectorySearcher(entry))
                {
                    searcher.Filter = $"(&(objectClass=user)(sAMAccountName={username}))";
                    searcher.PropertiesToLoad.Add("memberOf");

                    SearchResult result = searcher.FindOne();
                    if (result != null)
                    {
                        foreach (string group in result.Properties["memberOf"])
                        {
                            if (group.Contains(groupName))
                            {
                                return true;
                            }
                        }
                    }
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Error: " + ex.Message);
        }

        return false;
    }
}

string username = "john.doe";
string groupName = "Administrators";

bool isMember = GroupMemberChecker.IsUserMemberOfGroup(username, groupName);
Console.WriteLine($"Is {username} a member of {groupName}? {isMember}");