Allow Access Control before accessing File System

public class ACL

    {

        private DirectoryInfo dInfo = null;

        private NativeObjectSecurity secInfo = null;

        private bool isAclSet = false;



        public ACL(string path)//, [System.Runtime.InteropServices.OptionalAttribute, System.Runtime.InteropServices.DefaultParameterValueAttribute(false)] // ERROR: Optional parameters aren't supported in C# bool isRegistryPath) 

        {

            this.dInfo = new DirectoryInfo(path);

            if (!dInfo.Exists)

                throw new ApplicationException("Path " + path + " not found");



            this.secInfo = dInfo.GetAccessControl(AccessControlSections.Access);

        }



        public bool CanAccess(string idName)

        {

            NTAccount userAcc = new NTAccount(idName);

            AuthorizationRuleCollection authRules = this.secInfo.GetAccessRules(true, true, typeof(NTAccount));

            bool allowAccess = false;

            bool denyAccess = false;



            foreach (FileSystemAccessRule authRule in authRules)

            {

                if (authRule.IdentityReference.Equals(userAcc))

                {

                    if (authRule.AccessControlType.Equals(AccessControlType.Deny))

                        denyAccess = (authRule.FileSystemRights & FileSystemRights.FullControl).Equals(FileSystemRights.FullControl);

                    else if (authRule.AccessControlType.Equals(AccessControlType.Allow))

                        allowAccess = (authRule.FileSystemRights & FileSystemRights.FullControl).Equals(FileSystemRights.FullControl);

                }

            }



            return (allowAccess & !denyAccess);

        }



        public void SetAccessible(string idName)

        {

            this.SetAccess(idName);

            this.isAclSet = true;

        }

        public void SetAccessibleToCurrentUser()

        {

            string currentUser = WindowsIdentity.GetCurrent().Name;

            this.SetAccessible(currentUser);

        }

        public void SetAccessibleToEveryone()

        {

            this.SetAccessible("EVERYONE");

        }

        private void SetAccess(string idName)

        {

            FileSystemAccessRule rule = new FileSystemAccessRule(idName, FileSystemRights.FullControl, InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit, PropagationFlags.NoPropagateInherit, AccessControlType.Allow);



            DirectorySecurity dSecInfo = (DirectorySecurity)this.secInfo;

            dSecInfo.RemoveAccessRule(rule);

            this.dInfo.SetAccessControl(dSecInfo);



            foreach (FileInfo info in this.dInfo.GetFiles())

            {

                FileSecurity fsec = info.GetAccessControl(AccessControlSections.Access);

                info.SetAccessControl(fsec);

            }



        }

        public void ResetAccessible(string idName)

        {

            if (this.isAclSet)

            {

                this.SetAccess(idName);

                this.isAclSet = false;

            }

        }

        public void ResetAccessibleToCurrentUser()

        {

            string currentUser = WindowsIdentity.GetCurrent().Name;

            this.ResetAccessible(currentUser);

        }

        public void ResetAccessibleToEveryone()

        {

            this.ResetAccessible("EVERYONE");

        }

        public void RemoveReadonlyAttribute()

        {

            //' remove readonly attributes from inner directories 

            foreach (DirectoryInfo di in this.dInfo.GetDirectories("*", SearchOption.AllDirectories))

                if ((di.Attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)

                    di.Attributes = (di.Attributes & ~FileAttributes.ReadOnly);



            //' remove readonly attributes from inner files 

            foreach (FileInfo fi in this.dInfo.GetFiles("*.*", SearchOption.AllDirectories))

                if ((fi.Attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)

                    fi.Attributes = (fi.Attributes & ~FileAttributes.ReadOnly);



            //' remove readonly attributes from top level directory 

            if ((this.dInfo.Attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)

                this.dInfo.Attributes = (this.dInfo.Attributes & ~FileAttributes.ReadOnly);

        }



    }