private double GetProductPrice(Product product)
{
if (ProductQuantities.TryGetValue(product, out int quantity))
{
return(product.Price * quantity);
}
throw new KeyNotFoundException(nameof(product));
}
public void AddItem(Product product, int amount)
{
if (product != null && amount > 0)
{
if (ProductQuantities.TryGetValue(product, out int productAmount))
{
ProductQuantities[product] = productAmount + amount;
return;
}
ProductQuantities.Add(product, amount);
}
}