public void AddItem(TProduct prod, int quantity) { CartLine line = lineCollection .Where(g => g.Product.ID == prod.ID) .FirstOrDefault(); if (line == null) { lineCollection.Add(new CartLine { Product = prod, Quantity = quantity }); } else { line.Quantity += quantity; } }
public void RemoveLine(TProduct product) { lineCollection.RemoveAll(l => l.Product.ID == product.ID); }