public decimal Total()
{
if (Basket != null && !Basket.Any())
{
throw new NullReferenceException();
}
CalculateTotal();
return(Basket.Sum(p => p.Price));
}
private void AddToBasket(object sender, RoutedEventArgs e)
{
string s = (sender as Button).Content.ToString();
Product product = Products.First((Product p) => p.ProductName.Equals(s));
if (!Basket.Any(b => b.Product.ID == product.ID))
{
Basket.Add(new ReceiptLine {
Amount = 1, Product = product, TotalPrice = product.UnitPrice
});
}
else
{
ReceiptLine receiptLine = Basket.First(p => p.Product.ID == product.ID);
receiptLine.Amount++;
receiptLine.TotalPrice += product.UnitPrice;
}
TotalSum = Basket.Sum(p => p.TotalPrice);
}
