Refactoring: Added interfaces, custom exceptions, UserManager unit tests, dependency injection/inversion; Regex match search by date, keywords

StudentHouseDashboard/Logic/IAnnouncementRepository.cs

@@ -0,0 +1,21 @@
+using Models;
+using System;
+using System.Collections.Generic;
+using System.Data.SqlClient;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Logic
+{
+    public interface IAnnouncementRepository
+    {
+        public List<Announcement> GetAllAnnouncements();
+        public Announcement GetAnnouncementById(int id);
+        public List<Announcement> GetAnnouncementsByPage(int p, int c);
+        public void CreateAnnouncement(string title, string description, User author, DateTime publishDate, bool isImportant, bool isSticky);
+        public void UpdateAnnouncement(int id, string title, string description, bool isImportant, bool isSticky);
+        public void DeleteAnnouncement(int id);
+        public List<Announcement> SearchAnnouncement(string query);
+    }
+}