Четене/филтриране на подгрупите на групата за разпространение на активна директория?

Ако сте на .NET 3.5 (или можете да надстроите до него), можете да използвате този код, като използвате пространството от имена System.DirectoryServices.AccountManagement:

// create the "context" in which to operate - your domain here, 
// as the old-style NetBIOS domain, and the container where to operate in
PrincipalContext ctx = new PrincipalContext(ContextType.Domain, "YOURDOMAIN", "cn=Distribution Group,dc=YourDomain,dc=local");

// define a "prototype" - an example of what you're searching for
// Here: just a simple GroupPrincipal - you want all groups
GroupPrincipal prototype = new GroupPrincipal(ctx);

// define a PrincipalSearcher to find those principals that match your prototype
PrincipalSearcher searcher = new PrincipalSearcher(prototype);

// define a list of strings to hold the group names        
List<string> groupNames = new List<string>();

// iterate over the result of the .FindAll() call
foreach(var gp in searcher.FindAll())
{
    // cast result to GroupPrincipal
    GroupPrincipal group = gp as GroupPrincipal;

    // if everything - grab the group's name and put it into the list
    if(group != null)
    {
       groupNames.Add(group.Name);
    }
}

Това задоволява ли вашите нужди?

За повече информация относно пространството от имена System.DirectoryServices.AccountManagement, прочетете Управление на принципи за сигурност на директорията в .NET Статия за Framework 3.5 в списание MSDN.

Ето решението, което направих; за интересуващите се:

public ArrayList getGroups()
{
    // ACTIVE DIRECTORY AUTHENTICATION DATA
    string ADDomain = "myDomain.local";
    string ADBranchsOU = "Distribution Group";
    string ADUser = "Admin";
    string ADPassword = "password";

    // CREATE ACTIVE DIRECTORY ENTRY 
    DirectoryEntry ADRoot 
        = new DirectoryEntry("LDAP://OU=" + ADBranchsOU
                             + "," + getADDomainDCs(ADDomain),
                             ADUser, 
                             ADPassword);

    // CREATE ACTIVE DIRECTORY SEARCHER
    DirectorySearcher searcher = new DirectorySearcher(ADRoot);
    searcher.Filter = "(&(objectClass=group)(cn=* Region))";
    SearchResultCollection searchResults = searcher.FindAll();

    // ADDING ACTIVE DIRECTORY GROUPS TO LIST
    ArrayList list = new ArrayList();
    foreach (SearchResult result in searchResults)
    {
        string groupName = result.GetDirectoryEntry().Name.Trim().Substring(3);
        list.Add(groupName);
    }
    return list; 
}

public string getADDomainDCs(string ADDomain)
{
    return (!String.IsNullOrEmpty(ADDomain)) 
        ? "DC=" + ADDomain.Replace(".", ",DC=") 
        : ADDomain;
}