Чем заменить Directory.GetFiles?

// First, process all the files directly under this folder
try
{
     files = root.GetFiles("*.*");
}
// This is thrown if even one of the files requires permissions greater
// than the application provides.
catch (UnauthorizedAccessException e)
{
// This code just writes out the message and continues to recurse.
// You may decide to do something different here. For example, you
// can try to elevate your privileges and access the file again.
    log.Add(e.Message);
}
catch (System.IO.DirectoryNotFoundException e)
{
    Console.WriteLine(e.Message);
}

        public static List<string> GetFilesRecursed(string dirPath, string searchPattern)
        {
            var result = new List<string>();
            string[] files = null;
 
            try
            {
                files = Directory.GetFiles(dirPath, searchPattern);
            }
            catch (UnauthorizedAccessException) {}
            catch (DirectoryNotFoundException) {}
 
            if (files != null)
            {
                foreach (var file in files)
                    result.Add(file);
 
                string[] subDirs = Directory.GetDirectories(dirPath);
 
                foreach (var subDir in subDirs)
                    result.AddRange(GetFilesRecursed(subDir, searchPattern));
            }
 
            return result;
        }

        public static List<string> GetFilesRecursed(string dirPath, string searchPattern)
        {
            var result = new List<string>();
            string[] files = null;
            try { files = Directory.GetFiles(dirPath, searchPattern); }
            catch (UnauthorizedAccessException) {}
            catch (DirectoryNotFoundException) {}
            if (files != null) {
                foreach (var file in files) result.Add(file);
                string[] subDirs = Directory.GetDirectories(dirPath);
                foreach (var subDir in subDirs) result.AddRange(GetFilesRecursed(subDir, searchPattern)); }
           return result;
        }

        public static List<string> GetFilesRecursed(string dirPath, string searchPattern)
        {
            var result = new List<string>();
            string[] files = null;
            try {
                files = Directory.GetFiles(dirPath, searchPattern);
                result.AddRange(files);
            }
            catch (UnauthorizedAccessException) {}
            catch (DirectoryNotFoundException) {}
            if (files != null) {
                string[] subDirs = Directory.GetDirectories(dirPath);
                foreach (var subDir in subDirs) result.AddRange(GetFilesRecursed(subDir, searchPattern));
            }
           return result;
        }