在windows2003中怎样得到局域网中的域的所有用户,工作组的所有用户？(100分)

[foison]

在windows2003中怎样得到局域网中的域的所有用户,工作组的所有用户？

[真相重于对错]

using DirectoryServices

[Knight94]

ref:
http://community.csdn.net/Expert/FAQ/FAQ_Index.asp?id=149991

[爱睡的猫]

接下面的代码

using System;
using System.DirectoryServices;

class Class1
{
static void Main (string[] args)
{
ShowLocalUsers();
}

public static void ShowLocalUsers()
{
DirectoryEntry root = new DirectoryEntry("WinNT:"); //alternativ WinNT://your_domain
DirectoryEntries domains = root.Children;
domains.SchemaFilter.Add("domain");
foreach (DirectoryEntry domain in domains)
{
Console.WriteLine(domain.Name);
DirectoryEntries computers = domain.Children;
computers.SchemaFilter.Add("computer");
foreach (DirectoryEntry computer in computers)
{
Console.WriteLine("\t" + computer.Name);
DirectoryEntries users = computer.Children;
users.SchemaFilter.Add("user");
foreach (DirectoryEntry user in users)
{
Console.WriteLine("\t\t" + user.Name);
}
}
}
}
}

[foison]

如果没有域，只有工作组，怎么得到组下面的用户呢？