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

StudentHouseDashboard/Models/Announcement.cs

@@ -5,7 +5,7 @@ using System.Text;
 
 namespace Models
 {
-    public class Announcement : GenericMessage, IVotable
+    public class Announcement : GenericMessage
     {
         public Announcement(int id, User author, string description, string title, DateTime publishDate, bool isImportant, bool isSticky) : base(id, author, description, title, publishDate)
         {
@@ -31,16 +31,6 @@ namespace Models
         {
             get; set;
         }
-
-        public void DownVote()
-        {
-            throw new NotImplementedException();
-        }
-
-        public void UpVote()
-        {
-            throw new NotImplementedException();
-        }
         public override string ToString()
         {
             return $"{Title} ({PublishDate.ToString("g")} - {Author.Name})";