public Bid(double value, Buyer bidder)
{
Value = value;
Bidder = bidder;
Time = DateTime.Now;
}
public IEnumerable<Bid> GetUserBids(Buyer buyer)
{
return Bids.Where(b => b.Bidder == buyer);
}
public IEnumerable<Sale> GetUserPurchase(Buyer buyer)
{
return Sales.Where(s => s.IsSaled).Where(s => s.Buyer == buyer);
}
public void AddBuyer(Buyer buyer)
{
if (_buyers.Count(b => b.Login == buyer.Login) == 0)
_buyers.Add(buyer);
else
throw new DuplicateNameException("login is not available");
}
