ImageGlass.Library.DirectoryFinder.FindDirectories C# (CSharp) Method

        public static List<string> FindDirectories(string RootDirectory,
            bool SearchAllDirectories, Predicate<string> Filter)
        {
            List<string> retList = new List<string>();

            try
            {
                // create a directory info object
                DirectoryInfo di = new DirectoryInfo(RootDirectory);

                // loop through directories populating the list
                Parallel.ForEach(di.GetDirectories(), folder =>
                {
                    try
                    {
                        // add the folder if it passes the filter
                        if ((Filter == null) || (Filter(folder.FullName)))
                        {
                            // add the folder
                            retList.Add(folder.FullName);

                            // get it's sub folders
                            if (SearchAllDirectories)
                                retList.AddRange(FindDirectories(folder.FullName, true,
                                    Filter));
                        }
                    }

                    catch (UnauthorizedAccessException)
                    {
                        // don't really need to do anything
                        // user just doesn't have access
                    }

                    catch (Exception ex)
                    {
                        // TODO: log the exception
                    }
                });
            }

            catch (Exception ex)
            {
                // TODO: save exception
            }

            // return the list
            return retList;
        }