/// <summary>
/// Updates the quantity of an item to the given number; If item does not exist in the cart it will be added
/// </summary>
/// <param name="item"></param>
/// <param name="quantity"></param>
/// <param name="lineTotal">optional parameter that override the line total</param>
public void AddOrUpdate(Item item, int quantity, decimal?lineTotal = null)
{
if (CartItems.TryGetValue(item.Name, out CartItem cartItem))
{
cartItem.Quantity = quantity;
if (lineTotal.HasValue)
{
cartItem.LineTotal = lineTotal.Value;
}
}
else
{
CartItems.Add(
item.Name,
new CartItem()
{
Item = item,
Quantity = quantity,
LineTotal = lineTotal.HasValue ? lineTotal.Value : quantity * item.DefaultUnitPrice
});
}
}
