private List <UserNotification> GetNotificationsByType(string filterOption, string userId, bool onlyUnread) { if (Enum.TryParse <UserNotificationOptionsEnum>(filterOption, out var notificationOption)) { switch (notificationOption) { case UserNotificationOptionsEnum.All: return(_userNotificationRepository.GetNotificationsByUserId(userId, onlyUnread).OrderByDescending(n => n.CreatedOn).ToList()); case UserNotificationOptionsEnum.Comments: return(_userNotificationRepository.GetCommentNotificationsByUserId(userId, onlyUnread).OrderByDescending(n => n.CreatedOn).ToList()); case UserNotificationOptionsEnum.Posts: return(_userNotificationRepository.GetPostNotificationsByUserId(userId, onlyUnread).OrderByDescending(n => n.CreatedOn).ToList()); case UserNotificationOptionsEnum.DeletionRequests: return(_userNotificationRepository.GetDeletionRequestNotificationsByUserId(userId, onlyUnread).OrderByDescending(n => n.CreatedOn).ToList()); case UserNotificationOptionsEnum.DeletionResponses: return(_userNotificationRepository.GetDeletionResponseNotificationsByUserId(userId, onlyUnread).OrderByDescending(n => n.CreatedOn).ToList()); } } return(null); }