Evaluate all set elements in a set

Evaluate all set elements in a set

 

The scenario is as follows: Order has a Suppler set, that is, there may be multiple suppliers under an Order; Supplier has a set of products, that is, purchasing multiple products for a Supplier.

The requirement is as follows: calculate the total price of all purchased products

The model is as follows:

    public class Order    {        public int OrderId { get; set; }        public ICollection<Supplier> Suppliers { get; set; }        public Order()        {            Suppliers = new List<Supplier>();        }    }    public class Supplier    {        public int SupplierId { get; set; }        public ICollection<Product> Products { get; set; }        public Supplier()        {            Products = new List<Product>();        }    }    public class Product    {        public int ProductId { get; set; }        public decimal UnitPrice { get; set; }        public int Quantity { get; set; }    }

 

Calculate the total price as follows:

        static void Main(string[] args)        {            var orders = new List<Order>            {                new Order                {                    OrderId = 1,                    Suppliers = new List<Supplier>                    {                        new Supplier {SupplierId=11, Products= new List<Product>                        {                            new Product {ProductId=111, Quantity=1, UnitPrice=10 },                            new Product {ProductId = 112, Quantity =1, UnitPrice = 20 }                        } },                        new Supplier {SupplierId =12, Products = new List<Product>                        {                            new Product {ProductId =113, Quantity =2, UnitPrice=30 },                            new Product {ProductId=114, Quantity=1, UnitPrice=50 }                        } }                    }                }            };            var suppliers = orders.Select(t => t.Suppliers);            var productTotalPrice = suppliers.Sum(t => t.Sum(p => p.Products.Sum(o => o.Quantity * o.UnitPrice)));            Console.WriteLine(productTotalPrice);            Console.ReadKey();        }