public IEnumerable <int> getSimularAnnouncements(Announcement announcement)
{
//Select all items from db except selected announcement
Announcements = _db.Announcements.Where(i => i.Id != announcement.Id).ToList();
//ititialize dictionary with key = announcement.Id, keyValue = similar words count
Dictionary <int, int> IdOfSimilarAnnouncements = new Dictionary <int, int>(Announcements.Count());
//words of selected announcement
var ourAnnouncementWords = announcement.Tittle.ToLower().Split(' ')
.Union(announcement.Description.ToLower().Split(' '));
foreach (var item in Announcements)
{
int sameWordsCount = 0;
var otherAnnouncementWord = item.Tittle.ToString().ToLower().Split(' ')
.Union(item.Description.ToLower().Split(' '));
var sameWords = ourAnnouncementWords.Intersect(otherAnnouncementWord);
sameWordsCount = sameWords.Count();
if (sameWordsCount == 0)
{
continue;
}
else
{
IdOfSimilarAnnouncements.Add(item.Id, sameWordsCount);
}
}
//get id of 3 most similar announcement
IEnumerable <int> ListOfThreeSimilarAnnouncements = IdOfSimilarAnnouncements.OrderByDescending(t => t.Value).Take(3).Select(t => t.Key);
return(ListOfThreeSimilarAnnouncements);
}
