Hi,

I've written a very quick console app to recursive through a directory tree
and display directories that have explicit file permissions (code below).  It
works, but GetAccessControl() fails on some folders (always the same) with
the error:

The binary form of an ACE object is invalid.
Parameter name: binaryForm

I've had a look at the folder properties, security tab for a couple of the
affected folders and everything seems to look ok.

Anyone have any ideas?

Thanks,
Ryan

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Security.Principal;
using System.Security.AccessControl;

namespace CheckACLs {
   class Program {
       static void Main(string[] args) {
           DirectoryInfo di = new DirectoryInfo(@"c:\");
           DisplayRights(di, 0);
           Console.ReadKey();
       }

       static void DisplayRights(DirectoryInfo di, int recurseLevel) {
           if (recurseLevel <= 2) {
               recurseLevel++;
               foreach (DirectoryInfo d in di.GetDirectories()) {
                   DisplayRights(d, recurseLevel);
               }
           }

           bool firstRun = true;

           DirectorySecurity ds = di.GetAccessControl();          
           foreach (FileSystemAccessRule fsa in ds.GetAccessRules(true,
false, typeof(NTAccount))) {
               if (firstRun) {
                   Console.WriteLine(di.FullName);
                   firstRun = false;
               }

               Console.WriteLine("\t" + fsa.IdentityReference.ToString() +
" " +
                   fsa.FileSystemRights.ToString() + " " +
                   fsa.AccessControlType.ToString());
           }
       }
   }
}