public IEnumerable<Category> GetAll()

        {

            var result = HttpRuntime.Cache[cacheKey] as string;

​

            if (String.IsNullOrWhiteSpace(result)) {

                if (!TempFileHandler.TempFileExists(tempFilename)) {

​

                    using (IRISEntityProvider db = new IRISEntityProvider()) {

                        List<Category> tmpResult = db.Set<Category>().Include("Keywords").Include("Keywords.Settings").Include("Keywords.Settings.Setting").Include("Keywords.ChildKeywords").OrderBy(item => item.SortOrder).ThenBy(item => item.Name).AsNoTracking().ToList();

                        db.Configuration.LazyLoadingEnabled = false;

​

                        result = SerializationHandler.JsonSerialize<List<Category>>(tmpResult, 3);

                        TempFileHandler.SaveToTempFile(tempFilename, result);

                    }

                } else {

                    result = TempFileHandler.ReadFromTempFile(tempFilename);

                }

​

                HttpRuntime.Cache.Insert(cacheKey, result, null, DateTime.UtcNow.AddHours(24), TimeSpan.Zero);

            }

​

            return SerializationHandler.JsonDeserialize<List<Category>>(result);

        }