// GET: MonAn
public ActionResult ChiTietMonAn(string id)
{
var model = MonAnQueries.FindFood(id);
CartViewModel cart = (CartViewModel)Session[ConstantsVariable.CART];
List <MonAnViewModel> recommendedFoods = RecommendedFoodQueries.Loc_CollaborativeFiltering(cart, id, 4);
ViewBag.RecommendedFoods = recommendedFoods;
return(View(model));
}
public static List <MonAnViewModel> Loc_CollaborativeFiltering(CartViewModel cart, string idChoosenFood, int quantity_Recommended)
{
var dsDatKHChinh = GetChoosingFoods(cart);
var bestCustomer = FindTheBestCollaborator(dsDatKHChinh, FindListHoaDon(idChoosenFood));
//Lay Ds rate bang duc lo
Dictionary <string, double> R_result = new Dictionary <string, double>();
foreach (var item in dsDatKHChinh)
{
double sim;
if (item.Quantity == 0)
{
sim = bestCustomer.FirstOrDefault(t => t.ID == item.ID).Quantity;
}
else
{
sim = item.Quantity;
}
R_result.Add(item.ID, sim);
}
//------------------------
var res = R_result.OrderByDescending(t => t.Value).Select(t => t.Key).ToList();
int indexChoosenFood = res.FindIndex(t => t == idChoosenFood);
res.RemoveAt(indexChoosenFood);
var collection = res.Take(quantity_Recommended).ToList();
List <MonAnViewModel> recommendedResult = new List <MonAnViewModel>();
if (collection.Count > 0)
{
foreach (var item in collection)
{
recommendedResult.Add(MonAnQueries.FindFood(item));
}
}
return(recommendedResult);
}