問題描述

I have a group, lets call it GotRocks. I am attempting to get all of its members, but I am getting wildly different results count-wise between DirectoryEntry and AccountManagement. Below are the counts by member retrieval method:

Method 1: DirectoryEntry.PropertyName.member = 350
Method 2: AccountManagement.GroupPrincipal.GetMembers(false) = 6500
Method 2: AccountManagement.GroupPrincipal.GetMembers(true) = 6500

As a sanity check, I went into ADUC and pulled the list of members from the group, which is limited to 2,000 by default. The important thing here is that ADUC seems to validate the AccountManagement result. I have checked the Children property as well, but it is blank. Also, none of the members listed in DirectoryEntry are of the SchemaName group - they are all users.

I do not think this is a code problem, but perhaps a lack of understanding of how DirectoryEntry and the GetMembers methods retrieve group members. Can anyone explain why the DirectoryEntry member list would yield a different result from the GetMembers recursive function? Is there a certain method or property I need to be aware of? Note: I have built a function that will query DirectoryEntry by "member;range={0}-{1}" where the loop gets members in chunks of 1,500. I am at a complete and utter loss here.

The fact that DirectoryEntry is returning so few results is problematic because I want to use DirectoryEntry for the simple fact that going this route is, at a minimum, two orders of magnitude faster than AccountManagement (i.e., stopwatch times of 1,100 milliseconds versus 250,000 milliseconds).

UPDATE 1: Methods:

Method 1: DirectoryEntry

private List<string> GetGroupMemberList(string strPropertyValue, string strActiveDirectoryHost, int intActiveDirectoryPageSize)
{
    // Variable declaration(s).
    List<string> listGroupMemberDn = new List<string>();
    string strPath = strActiveDirectoryHost + "/<GUID=" + strPropertyValue + ">";
    string strMemberPropertyRange = null;
    DirectoryEntry directoryEntryGroup = null;
    DirectorySearcher directorySearcher = null;
    SearchResultCollection searchResultCollection = null;
    // https://msdn.microsoft.com/en-us/library/windows/desktop/ms676302(v=vs.85).aspx
    const int intIncrement = 1500;

    // Load the DirectoryEntry.
    try
    {
        directoryEntryGroup = new DirectoryEntry(strPath, null, null, AuthenticationTypes.Secure);

        directoryEntryGroup.RefreshCache();
    }
    catch (Exception)
    { }

    try
    {
        if (directoryEntryGroup.Properties["member"].Count > 0)
        {
            int intStart = 0;

            while (true)
            {
                int intEnd = intStart + intIncrement - 1;

                // Define the PropertiesToLoad attribute, which contains a range flag that LDAP uses to get a list of members in a pre-specified chunk/block of members that is defined by each loop iteration.
                strMemberPropertyRange = string.Format("member;range={0}-{1}", intStart, intEnd);

                directorySearcher = new DirectorySearcher(directoryEntryGroup)
                {
                    Filter = "(|(objectCategory=person)(objectCategory=computer)(objectCategory=group))", // User, Contact, Group, Computer objects

                    SearchScope = SearchScope.Base,

                    PageSize = intActiveDirectoryPageSize,

                    PropertiesToLoad = { strMemberPropertyRange }
                };

                try
                {
                    searchResultCollection = directorySearcher.FindAll();

                    foreach (SearchResult searchResult in searchResultCollection)
                    {
                        var membersProperties = searchResult.Properties;

                        // Find the property that starts with the PropertyName of "member;" and get all of its member values.
                        var membersPropertyNames = membersProperties.PropertyNames.OfType<string>().Where(n => n.StartsWith("member;"));

                        // For each record in the memberPropertyNames, get the PropertyName and add to the lest.
                        foreach (var propertyName in membersPropertyNames)
                        {
                            var members = membersProperties[propertyName];

                            foreach (string memberDn in members)
                            {                                   
                                listGroupMemberDn.Add(memberDn);
                            }
                        }
                    }
                }
                catch (DirectoryServicesCOMException)
                {
                    // When the start of the range exceeds the number of available results, an exception is thrown and we exit the loop.
                    break;
                }

                intStart += intIncrement;
            }
        }

        return listGroupMemberDn;
    }
    finally
    {
        listGroupMemberDn = null;
        strPath = null;
        strMemberPropertyRange = null;
        directoryEntryGroup.Close();
        if(directoryEntryGroup != null) directoryEntryGroup.Dispose();                
        if (directorySearcher != null) directorySearcher.Dispose();
        if(searchResultCollection != null) searchResultCollection.Dispose();
    }
}

Method 2: AccountManagement (toggle bolRecursive as either true or false).

private List<Guid> GetGroupMemberList(string strPropertyValue, string strDomainController, bool bolRecursive)
{
    // Variable declaration(s).
    List<Guid> listGroupMemberGuid = null;
    GroupPrincipal groupPrincipal = null;
    PrincipalSearchResult<Principal> listPrincipalSearchResult = null;
    List<Principal> listPrincipalNoNull = null;
    PrincipalContext principalContext = null;
    ContextType contextType;
    IdentityType identityType;

    try
    {
        listGroupMemberGuid = new List<Guid>();

        contextType = ContextType.Domain;

        principalContext = new PrincipalContext(contextType, strDomainController);

        // Setup the IdentityType. Use IdentityType.Guid because GUID is unique and never changes for a given object. Make sure that is what strPropertyValue is receiving.
        // This is required, otherwise you will get a MultipleMatchesException error that says "Multiple principals contain a matching Identity."
        // This happens when you have two objects that AD thinks match whatever you're passing to UserPrincipal.FindByIdentity(principalContextDomain, strPropertyValue)
        identityType = IdentityType.Guid;

        groupPrincipal = GroupPrincipal.FindByIdentity(principalContext, identityType, strPropertyValue);

        if (groupPrincipal != null)
        {
            // Get all members that the group contains and add it to the list.
            // Note: The true flag in GetMembers() specifies a recursive search, which enables the application to search a group recursively and return only principal objects that are leaf nodes.
            listPrincipalSearchResult = groupPrincipal.GetMembers(bolRecursive);

            // Remove the nulls from the list, otherwise the foreach loop breaks prematurly on the first null found and misses all other object members.
            listPrincipalNoNull = listPrincipalSearchResult.Where(item => item.Name != null).ToList();

            foreach (Principal principal in listPrincipalNoNull)
            {
                listGroupMemberGuid.Add((Guid)principal.Guid);
            }
        }

        return listGroupMemberGuid;
    }
    catch (MultipleMatchesException)
    {
        // Multiple principals contain a matching identity. 
        // In other words, the same property value was found on more than one record in either of the six attributes that are listed within the IdentityType enum.
        throw new MultipleMatchesException(strPropertyValue);
    }
    finally
    {
        // Cleanup objects.
        listGroupMemberGuid = null;
        if(listPrincipalSearchResult != null) listPrincipalSearchResult.Dispose();
        if(principalContext != null) principalContext.Dispose();
        if(groupPrincipal != null) groupPrincipal.Dispose();
    }
}

UPDATE 2:

public static void Main()
{
    Program objProgram = new Program();

    // Other stuff here.

    objProgram.GetAllUserSingleDc();

    // Other stuff here.
}

private void GetAllUserSingleDc()
{
    string strDomainController = "domain.com"; 
    string strActiveDirectoryHost = "LDAP://" + strDomainController;
    int intActiveDirectoryPageSize = 1000;
    string[] strAryRequiredProperties = null;
    DirectoryEntry directoryEntry = null;
    DirectorySearcher directorySearcher = null;
    SearchResultCollection searchResultCollection = null;
    DataTypeConverter objConverter = null;
    Type fieldsType = null;

    fieldsType = typeof(AdUserInfoClass);

    objConverter = new DataTypeConverter();

    directoryEntry = new DirectoryEntry(strActiveDirectoryHost, null, null, AuthenticationTypes.Secure);

    directorySearcher = new DirectorySearcher(directoryEntry)
    {
        //Filter = "(|(objectCategory=person)(objectCategory=computer)(objectCategory=group))", // User, Contact, Group, Computer objects
        Filter = "(sAMAccountName=GotRocks)", // Group

        SearchScope = SearchScope.Subtree,

        PageSize = intActiveDirectoryPageSize

        PropertiesToLoad = { "isDeleted","isCriticalSystemObject","objectGUID","objectSid","objectCategory","sAMAccountName","sAMAccountType","cn","employeeId",
                            "canonicalName","distinguishedName","userPrincipalName","displayName","givenName","sn","mail","telephoneNumber","title","department",
                            "description","physicalDeliveryOfficeName","manager","userAccountControl","accountExpires","lastLogon","logonCount","lockoutTime",
                            "primaryGroupID","pwdLastSet","uSNCreated","uSNChanged","whenCreated","whenChanged","badPasswordTime","badPwdCount","homeDirectory",
                            "dNSHostName" }
    };         

    searchResultCollection = directorySearcher.FindAll();            

    try
    {
        foreach (SearchResult searchResult in searchResultCollection)
        {
            clsAdUserInfo.GidObjectGuid = objConverter.ConvertByteAryToGuid(searchResult, "objectGUID");            
            clsAdUserInfo.StrDirectoryEntryPath = strActiveDirectoryHost + "/<GUID=" + clsAdUserInfo.GidObjectGuid + ">";
            clsAdUserInfo.StrSchemaClassName = new DirectoryEntry(clsAdUserInfo.StrDirectoryEntryPath, null, null, AuthenticationTypes.Secure).SchemaClassName;

            if (clsAdUserInfo.StrSchemaClassName == "group")
            {
                // Calling the functions here.
                List<string> listGroupMemberDnMethod1 = GetGroupMemberListStackOverflow(clsAdUserInfo.GidObjectGuid.ToString(), strActiveDirectoryHost, intActiveDirectoryPageSize);

                List<Guid> listGroupMemberGuidMethod2 = GetGroupMemberList(clsAdUserInfo.GidObjectGuid.ToString(), strDomainController, false)
            }   
            // More stuff here.
        }
    }
    finally
    {
        // Cleanup objects.
        // Class constructors.
        objProgram = null;
        clsAdUserInfo = null;
        // Variables.
        intActiveDirectoryPageSize = -1;
        strActiveDirectoryHost = null;
        strDomainController = null;
        strAryRequiredProperties = null;
        directoryEntry.Close();
        if(directoryEntry !=null) directoryEntry.Dispose();
        if(directorySearcher != null) directorySearcher.Dispose();
        if(searchResultCollection != null) searchResultCollection.Dispose();
        objConverter = null;
        fieldsType = null;
    }   
}

UPDATE 3:

Below is the list of namespaces that I am using.

using System;
using System.Collections.Generic;
using System.DirectoryServices;
using System.DirectoryServices.AccountManagement;
using System.Security.Principal;
using System.Text;
using System.Linq;
using System.Collections;

UPDATE 4: Program.cs

using System;
using System.Collections.Generic;
using System.DirectoryServices;
using System.DirectoryServices.AccountManagement;
using System.Security.Principal;
using System.Text;
using System.Linq;

namespace activeDirectoryLdapExamples
{
    public class Program
    {
         public static void Main()
        {
            Program objProgram = new Program();
            objProgram.GetAllUserSingleDc();
        }

        #region GetAllUserSingleDc
        private void GetAllUserSingleDc()
        {
            Program objProgram = new Program();
            string strDomainController = "EnterYourDomainhere";
            string strActiveDirectoryHost = "LDAP://" + strDomainController;
            int intActiveDirectoryPageSize = 1000;
            DirectoryEntry directoryEntry = null;
            DirectorySearcher directorySearcher = null;
            SearchResultCollection searchResultCollection = null;
            DataTypeConverter objConverter = null;

            objConverter = new DataTypeConverter();

            directoryEntry = new DirectoryEntry(strActiveDirectoryHost, null, null, AuthenticationTypes.Secure);

            directorySearcher = new DirectorySearcher(directoryEntry)
            {
                Filter = "(sAMAccountName=GotRocks)", // Group

                SearchScope = SearchScope.Subtree,

                PageSize = intActiveDirectoryPageSize,

                PropertiesToLoad = { "isDeleted","isCriticalSystemObject","objectGUID","objectSid","objectCategory","sAMAccountName","sAMAccountType","cn","employeeId",
                                        "canonicalName","distinguishedName","userPrincipalName","displayName","givenName","sn","mail","telephoneNumber","title","department",
                                        "description","physicalDeliveryOfficeName","manager","userAccountControl","accountExpires","lastLogon","logonCount","lockoutTime",
                                        "primaryGroupID","pwdLastSet","uSNCreated","uSNChanged","whenCreated","whenChanged","badPasswordTime","badPwdCount","homeDirectory",
                                        "dNSHostName" }
            };

            searchResultCollection = directorySearcher.FindAll();

            try
            {
                foreach (SearchResult searchResult in searchResultCollection)
                {                    
                    Guid? gidObjectGuid = objConverter.ConvertByteAryToGuid(searchResult, "objectGUID");
                    string StrSamAccountName = objConverter.ConvertToString(searchResult, "sAMAccountName");
                    // Get new DirectoryEntry and retrieve the SchemaClassName from it by binding the current objectGUID to it.
                    string StrDirectoryEntryPath = strActiveDirectoryHost + "/<GUID=" + gidObjectGuid + ">";
                    string StrSchemaClassName = new DirectoryEntry(StrDirectoryEntryPath, null, null, AuthenticationTypes.Secure).SchemaClassName;

                    #region GetGroupMembers
                    if (StrSchemaClassName == "group")
                    {
                        // FAST!
                        var watch = System.Diagnostics.Stopwatch.StartNew();
                        List<string> listGroupMemberDn = GetGroupMemberList(gidObjectGuid.ToString(), strActiveDirectoryHost, intActiveDirectoryPageSize);
                        watch.Stop();
                        var listGroupMemberDnElapsedMs = watch.ElapsedMilliseconds;

                        // SLOW!
                        watch = System.Diagnostics.Stopwatch.StartNew();
                        List<Guid> listGroupMemberGuidRecursiveTrue = GetGroupMemberList(gidObjectGuid.ToString(), strDomainController, true);
                        watch.Stop();
                        var listGroupMemberGuidRecursiveTrueElapsedMs = watch.ElapsedMilliseconds;

                        watch = System.Diagnostics.Stopwatch.StartNew();
                        List<Guid> listGroupMemberGuidRecursiveFalse = GetGroupMemberList(gidObjectGuid.ToString(), strDomainController, false);
                        watch.Stop();
                        var listGroupMemberGuidRecursiveFalseElapsedMs = watch.ElapsedMilliseconds;

                        ////// Display all members of the list.
                        //listGroupMemberDn.ForEach(item => Console.WriteLine("Member GUID: {0}", item));
                        //listGroupMemberGuidRecursiveTrue.ForEach(item => Console.WriteLine("Member GUID: {0}", item));
                        //listGroupMemberGuidRecursiveFalse.ForEach(item => Console.WriteLine("Member GUID: {0}", item));

                        Console.WriteLine("objectGUID: {0}", gidObjectGuid);
                        Console.WriteLine("sAMAccountName: {0}", strSamAccountName);

                        // Result: 350
                        Console.WriteLine("
listGroupMemberDn Count Members: {0}", listGroupMemberDn.Count);
                        Console.WriteLine("Total RunTime listGroupMemberDnElapsedMs (in milliseconds): {0}", listGroupMemberDnElapsedMs);

                        // Result: 6500
                        Console.WriteLine("
listGroupMemberGuidRecursiveTrue Count Members: {0}", listGroupMemberGuidRecursiveTrue.Count);
                        Console.WriteLine("Total RunTime listGroupMemberGuidRecursiveTrueElapsedMs (in milliseconds): {0}", listGroupMemberGuidRecursiveTrueElapsedMs);

                        // Result: 6500
                        Console.WriteLine("
listGroupMemberGuidRecursiveFalse Count Members: {0}", listGroupMemberGuidRecursiveFalse.Count);
                        Console.WriteLine("Total RunTime listGroupMemberGuidRecursiveFalseElapsedMs (in milliseconds): {0}", listGroupMemberGuidRecursiveFalseElapsedMs);
                        Console.WriteLine("
");
                    }
                    #endregion

                    #region CurrentSearchResult
                    else
                    {
                        Console.WriteLine("ObjectGuid = {0}", gidObjectGuid);
                        Console.WriteLine("SamAccountName = {0}", strSamAccountName);

                    }
                    #endregion
                }

                Console.WriteLine("
Press any key to continue.");
                Console.ReadKey();
            }
            finally
            {
                objProgram = null;
                intActiveDirectoryPageSize = -1;
                strActiveDirectoryHost = null;
                strDomainController = null;
                directoryEntry.Close();
                if (directoryEntry != null) directoryEntry.Dispose();
                if (directorySearcher != null) directorySearcher.Dispose();
                if (searchResultCollection != null) searchResultCollection.Dispose();
                objConverter = null;
            }
        }
        #endregion

        #region GetGroupMemberListGuid
        private List<Guid> GetGroupMemberList(string strPropertyValue, string strDomainController, bool bolRecursive)
        {
            List<Guid> listGroupMemberGuid = null;
            List<Principal> listPrincipalNoNull = null;
            GroupPrincipal groupPrincipal = null;
            PrincipalSearchResult<Principal> listPrincipalSearchResult = null;
            PrincipalContext principalContext = null;
            ContextType contextType;
            IdentityType identityType;

            try
            {
                listGroupMemberGuid = new List<Guid>();

                contextType = ContextType.Domain;

                principalContext = new PrincipalContext(contextType, strDomainController);

                identityType = IdentityType.Guid;

                groupPrincipal = GroupPrincipal.FindByIdentity(principalContext, identityType, strPropertyValue);

                if (groupPrincipal != null)
                {
                    listPrincipalSearchResult = groupPrincipal.GetMembers(bolRecursive);

                    listPrincipalNoNull = listPrincipalSearchResult.Where(item => item.Name != null).ToList();

                    foreach (Principal principal in listPrincipalNoNull)
                    {
                        listGroupMemberGuid.Add((Guid)principal.Guid);
                    }
                }

                return listGroupMemberGuid;
            }
            catch (MultipleMatchesException)
            {
                throw new MultipleMatchesException(strPropertyValue);
            }
            finally
            {
                // Cleanup objects.
                listGroupMemberGuid = null;
                listPrincipalNoNull = null;
                principalContext = null;
                if (groupPrincipal != null) groupPrincipal.Dispose();
                if (listPrincipalSearchResult != null) listPrincipalSearchResult.Dispose();
                if (principalContext != null) principalContext.Dispose();
            }
        }
        #endregion

        #region GetGroupMemberListDn
        private List<string> GetGroupMemberList(string strPropertyValue, string strActiveDirectoryHost, int intActiveDirectoryPageSize)
        {
            List<string> listGroupMemberDn = new List<string>();
            string strPath = strActiveDirectoryHost + "/<GUID=" + strPropertyValue + ">";
            const int intIncrement = 1500; // https://msdn.microsoft.com/en-us/library/windows/desktop/ms676302(v=vs.85).aspx

            var members = new List<string>();

            // The count result returns 350.
            var group = new DirectoryEntry(strPath, null, null, AuthenticationTypes.Secure);
            //var group = new DirectoryEntry($"LDAP://{"EnterYourDomainHere"}/<GUID={strPropertyValue}>", null, null, AuthenticationTypes.Secure);

            while (true)
            {
                var memberDns = group.Properties["member"];
                foreach (var member in memberDns)
                {
                    members.Add(member.ToString());
                }

                if (memberDns.Count < intIncrement) break;

                group.RefreshCache(new[] { $"member;range={members.Count}-*" });
            }
            return members;
        }
        #endregion

        #region DataTypeConvert
        private class DataTypeConverter
        {
            public DataTypeConverter() { }

            public String ConvertToString(SearchResult searchResult, string strPropertyName)
            {
                String bufferObjectString = null;

                try
                {
                    bufferObjectString = (String)this.GetPropertyValue(searchResult, strPropertyName);

                    if (string.IsNullOrEmpty(bufferObjectString))
                    {
                        return null;
                    }
                    else
                    {
                        return bufferObjectString;
                    }
                }
                finally
                {
                    bufferObjectString = null;
                }
            }

            public Guid? ConvertByteAryToGuid(SearchResult searchResult, string strPropertyName)
            {
                Guid? bufferObjectGuid = null;

                try
                {
                    bufferObjectGuid = new Guid((Byte[])(Array)this.GetPropertyValue(searchResult, strPropertyName));

                    if (bufferObjectGuid == null || bufferObjectGuid == Guid.Empty)
                    {
                        throw new NullReferenceException("The field " + strPropertyName + ", of type GUID, can neither be NULL nor empty.");
                    }
                    else
                    {
                        return bufferObjectGuid;
                    }
                }
                finally
                {
                    bufferObjectGuid = null;
                }
            }
        }
        #endregion
    }
}

The last code block (Update 2) is the answer!

The code you have for reading the member attribute is more complicated than it needs to be. There may be a reason in there why it's returning skewed results, but I didn't look too hard because you don't need to be using DirectorySearcher at all. I just rewrote it.

Here is what it should look like, in it's simplest form:

private static List<string> GetGroupMemberList(string groupGuid, string domainDns) {
    var members = new List<string>();

    var group = new DirectoryEntry($"LDAP://{domainDns}/<GUID={groupGuid}>", null, null, AuthenticationTypes.Secure);

    while (true) {
        var memberDns = group.Properties["member"];
        foreach (var member in memberDns) {
            members.Add(member.ToString());
        }

        if (memberDns.Count == 0) break;

        try {
            group.RefreshCache(new[] {$"member;range={members.Count}-*", "member"});
        } catch (System.Runtime.InteropServices.COMException e) {
            if (e.ErrorCode == unchecked((int) 0x80072020)) { //no more results
                break;
            }
            throw;
        }
    }
    return members;
}

Call it like this:

var members = GetGroupMemberList("00000000-0000-0000-0000-000000000000", "domain.com");

This is not recursive. To make it recursive, you will have to create a new DirectoryEntry from each member and test if it is a group, then get the members of that group.

I have the code open, so here's the recursive version. It is slow because it has to bind to each member to see if it's a group.

This is not bullet-proof. There are still cases where you might get weird results (like if you have users on trusted external domains in a group).

private static List<string> GetGroupMemberList(string groupGuid, string domainDns, bool recurse = false) {
    var members = new List<string>();

    var group = new DirectoryEntry($"LDAP://{domainDns}/<GUID={groupGuid}>", null, null, AuthenticationTypes.Secure);

    while (true) {
        var memberDns = group.Properties["member"];
        foreach (var member in memberDns) {
            if (recurse) {
                var memberDe = new DirectoryEntry($"LDAP://{member}");
                if (memberDe.Properties["objectClass"].Contains("group")) {
                    members.AddRange(GetGroupMemberList(
                        new Guid((byte[]) memberDe.Properties["objectGuid"].Value).ToString(), domainDns,
                        true));
                } else {
                    members.Add(member.ToString());
                }
            } else {
                members.Add(member.ToString());
            }
        }

        if (memberDns.Count == 0) break;

        try {
            group.RefreshCache(new[] {$"member;range={members.Count}-*", "member"});
        } catch (System.Runtime.InteropServices.COMException e) {
            if (e.ErrorCode == unchecked((int) 0x80072020)) { //no more results
                break;
            }
            throw;
        }
    }
    return members;
}

Update: I did have to edit your GetMembers example, since it kept throwing exceptions on me. I commented out the .Where line and changed the foreach loop that adds the members to the list:

        //listPrincipalNoNull = listPrincipalSearchResult.Where(item => item.Name != null).ToList();
        if (groupPrincipal != null) {
            foreach (Principal principal in listPrincipalSearchResult) {
                listGroupMemberGuid.Add(((DirectoryEntry)principal.GetUnderlyingObject()).Guid);
            }
        }

This, of course, is compiling a list of Guids rather than DNs.

Update 2: Here is a version that also pulls users who have the group as the primary group (but not listed in the member attribute of the group). GetMembers seems to do this. It would be odd for a user-created group to be the primary group, but it is technically possible. Parts of this are copied from the answer here: How to retrieve Users in a Group, including primary group users

private List<string> GetGroupMemberList(string strPropertyValue, string strActiveDirectoryHost, int intActiveDirectoryPageSize)
{
    // Variable declaration(s).
    List<string> listGroupMemberDn = new List<string>();
    string strPath = strActiveDirectoryHost + "/<GUID=" + strPropertyValue + ">";
    const int intIncrement = 1500; // https://msdn.microsoft.com/en-us/library/windows/desktop/ms676302(v=vs.85).aspx

    var members = new List<string>();

    // The count result returns 350.
    var group = new DirectoryEntry(strPath, null, null, AuthenticationTypes.Secure);
    //var group = new DirectoryEntry($"LDAP://{"EnterYourDomainHere"}/<GUID={strPropertyValue}>", null, null, AuthenticationTypes.Secure);

    while (true)
    {
        var memberDns = group.Properties["member"];
        foreach (var member in memberDns)
        {
            members.Add(member.ToString());
        }

        if (memberDns.Count < intIncrement) break;

        group.RefreshCache(new[] { $"member;range={members.Count}-*" });
    }

    //Find users that have this group as a primary group
    var secId = new SecurityIdentifier(group.Properties["objectSid"][0] as byte[], 0);

    /* Find The RID (sure exists a best method)
     */
    var reg = new Regex(@"^S.*-(d+)$");
    var match = reg.Match(secId.Value);
    var rid = match.Groups[1].Value;

    /* Directory Search for users that has a particular primary group
     */
    var dsLookForUsers =
        new DirectorySearcher {
            Filter = string.Format("(primaryGroupID={0})", rid),
            SearchScope = SearchScope.Subtree,
            PageSize = 1000,
            SearchRoot = new DirectoryEntry(strActiveDirectoryHost)
    };
    dsLookForUsers.PropertiesToLoad.Add("distinguishedName");

    var srcUsers = dsLookForUsers.FindAll();

    foreach (SearchResult user in srcUsers)
    {
        members.Add(user.Properties["distinguishedName"][0].ToString());
    }
    return members;
}

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