C# Scan Directories recusively with given Maxdepth

I have the followin class, scanning all Subdirectories of a given Directory. I would like to add a new parameter "Maxdepth", so it only scans with a maximum Depth of the given param

e.g.

Dir 1
  Dir 1.1
    Dir 1.1.1
      Dir 1.1.1.1 -> should not be scanned

How can I count the actual depth and go to the next directory?

Actualy I have 3 Arguments:
1. List with Include Paths
2. List with exclude paths
3. Boolean for recursive scan

The 4. Parameter should be the Maxdepth

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Management;
using System.Xml.Linq;
using System.IO;
using System.Security;
using System.Security.AccessControl;
using System.Security.Principal;
using System.DirectoryServices.ActiveDirectory;
using System.DirectoryServices;
using System.Windows.Forms;
 
namespace DirectoryScan
{
    public class ACL
    {
 
        /// <summary>
        /// Variables
        /// </summary>
        private String mDirectoryName       = string.Empty;
        private String mAccountName         = string.Empty;
        private String mTyp                 = string.Empty;
        private String mRights              = string.Empty;
        private String mInherited           = string.Empty;
        private String mInheritanceFlags    = string.Empty;
        private String mPropagationFlags    = string.Empty;
        private int mDirectoryCount         = 0;
 
        /// <summary>
        /// Default Constructor
        /// </summary>
        public ACL()
        {
        
        }
 
        public static Dictionary<String, List<ACL>> GetACLInformation(List<Object> includePath, List<Object> excludePath, bool recursive)
        {
 
            // Create Collection Instance
            Dictionary<String,List<ACL>> aclSet = new Dictionary<String,List<ACL>>();
 
            foreach (String driveInfo in includePath)
            {
                // Call recursive private Method
                readDir(new DirectoryInfo(driveInfo), excludePath, aclSet, recursive);
            }
 
            // Return Dictionary
            return new Dictionary<string,List<ACL>>(aclSet);
 
        }
 
 
        private static void readDir(DirectoryInfo directory, List<Object> excludePath, Dictionary<String,List<ACL>> lAclSet, bool recursive)
        {
 
            try
            {
 
                // Check exclude Paths
                if (! excludePath.Contains(directory.FullName.ToString().Trim()))
                {
 
                    // Save Directory Name
                    String dirName = directory.FullName.ToString();
 
                    // Count Subfolders
                    DirectoryInfo[] subDirs = directory.GetDirectories();
                    String dirCount = subDirs.Length.ToString();
 
                    // Create Key
                    String key = dirName + ";" + dirCount;
                    
 
                    // Security Object
                    DirectorySecurity ds = directory.GetAccessControl(AccessControlSections.Access);
                    
                    // Showing access rules data
                    AuthorizationRuleCollection arc = ds.GetAccessRules(true, true, typeof(NTAccount));
                    
                    // Create List
                    List<ACL> aclList = new List<ACL>();
 
                    foreach (FileSystemAccessRule ar in arc)
                    {
 
                        // Create Object
                        ACL acl = new ACL();
 
                        // Set Values
                        acl.AccountName         = ar.IdentityReference.Value.ToString();
                        acl.Typ                 = ar.AccessControlType.ToString();
                        acl.Rights              = ar.FileSystemRights.ToString();
                        acl.Inherited           = ar.IsInherited.ToString();
                        acl.InheritanceFlags    = ar.InheritanceFlags.ToString();
                        acl.PropagationFlags    = ar.PropagationFlags.ToString();
 
                        // Add to List
                        aclList.Add(acl);
 
                    }
 
                    // Add to Dictionary
                    if (! lAclSet.ContainsKey(key))
                    {
                        lAclSet.Add(key, aclList);
                    }
 
                }
 
 
                // Search in Subfolders if recursive true
                if (recursive)
                {
                    foreach (DirectoryInfo subDirectory in directory.GetDirectories())
                    {
                        readDir(subDirectory, excludePath, lAclSet, recursive);
                    }
                }
            }
            catch
            {
                return;
            }
 
        }
 
 
        public String DirectoryName
        {
            get { return mDirectoryName; }
            set { mDirectoryName = value; }
        }
 
        public String AccountName
        {
            get { return mAccountName; }
            set { mAccountName = value; }
        }
 
        public String Typ
        {
            get { return mTyp; }
            set { mTyp = value; }
        }
 
        public String Rights
        {
            get { return mRights; }
            set { mRights = value; }
        }
 
        public String Inherited
        {
            get { return mInherited; }
            set { mInherited = value; }
        }
 
        public String InheritanceFlags
        {
            get { return mInheritanceFlags; }
            set { mInheritanceFlags = value; }
        }
 
        public String PropagationFlags
        {
            get { return mPropagationFlags; }
            set { mPropagationFlags = value; }
        }
 
        public int DirectoryCount
        {
            get { return mDirectoryCount; }
            set { mDirectoryCount = value; }
        }
    }
}

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