public async Task UpdateMessagesFromApi(int dialogId, int?offset = null) { var dialog = FirstOrDefaultWithLock(dialogId); if (dialog == null) { return; } var collection = dialog.Messages; var newMessages = await MessagesClient.GetMessages(dialog.Id, offset); if (newMessages.Any()) { var isNewestMessagesBatch = offset == null; AddUpdateMessagesInCollection(dialogId, newMessages, dialog.UnreadCount, isNewestMessagesBatch); await DurableCacheManager.SaveMessages(dialog.Id, collection).ConfigureAwait(false); } }