System.IO.IsolatedStorage.IsolatedStorageFile.ContainsUnknownFiles C# (CSharp) Method

        private bool ContainsUnknownFiles(string directory)
        {
            string[] dirs, files;

            try
            {
                files = Directory.GetFiles(directory);
                dirs = Directory.GetDirectories(directory);
            }
            catch
            {
                throw new IsolatedStorageException(SR.IsolatedStorage_DeleteDirectories);
            }

            if (dirs.Length > 1 || (dirs.Length > 0 && !IsMatchingScopeDirectory(dirs[0])))
            {
                // Unknown folder present
                return true;
            }

            if (files.Length == 0)
                return false;

            // Check if we have unknown files

            // Note that we don't generate these files in CoreFX, but we want to match
            // NetFX removal semantics as NetFX will generate these.

            if (Helper.IsRoaming(Scope))
                return ((files.Length > 1) || !IsIdFile(files[0]));

            return (files.Length > 2 ||
                (
                    (!IsIdFile(files[0]) && !IsInfoFile(files[0]))) ||
                    (files.Length == 2 && !IsIdFile(files[1]) && !IsInfoFile(files[1]))
                );
        }