//Добавление товара в корзину
public virtual void AddItem(Makdonalds makdonalds, int quantity)
{
MDCartLine line = lineCollection
.Where(p => p.Makdonalds.Id == makdonalds.Id).FirstOrDefault();
if (line == null)
{
lineCollection.Add(new MDCartLine
{
Makdonalds = makdonalds,
Quantity = quantity
});
}
else
{
line.Quantity += quantity;
}
}
//Удаление товара из корзины public virtual void RemoveLine(Makdonalds makdonalds) => lineCollection.RemoveAll(l => l.Makdonalds.Id == makdonalds.Id);