public SaleLineItem AddSaleLineItem(MenuProduct menuProduct)
{
SaleLineItem newLineItem = (SaleLineItems.Where(sli => sli.MenuProduct == menuProduct)).SingleOrDefault();
if (newLineItem == null)
{
newLineItem = new SaleLineItem(this, menuProduct);
this.SaleLineItems.Add(newLineItem);
}
else
{
newLineItem.IncrementQuantity();
}
return(newLineItem);
}
public void CancelSaleLineItem(MenuProduct menuProduct)
{
SaleLineItem sli = SaleLineItems.Where(s => s.MenuProduct == menuProduct).FirstOrDefault();
SaleLineItems.Remove(sli);
}
public int DecrementQuantity(MenuProduct menuProduct)
{
SaleLineItem sli = SaleLineItems.Where(s => s.MenuProduct == menuProduct).FirstOrDefault();
return(sli.DecrementQuantity());
}