Evaluates all collection elements under the collection of a collection

The scenario is this: there is a collection of suppler under order, that is, there may be multiple vendors under an order; supplier has a collection of product, which is the purchase of multiple products from one vendor.

The demand is this: figure out the total price of all ordered products

Model This way:

     Public classOrder { Public intOrderId {Get;Set; }  PublicIcollection<supplier> Suppliers {Get;Set; }  PublicOrder () {Suppliers=NewList<supplier>(); }    }     Public classSupplier { Public intSupplierId {Get;Set; }  PublicIcollection<product> Products {Get;Set; }  PublicSupplier () { Products=NewList<product>(); }    }     Public classProduct { Public intProductId {Get;Set; }  Public decimalUnitPrice {Get;Set; }  Public intQuantity {Get;Set; } }

This calculates the total price:

        Static voidMain (string[] args) {            varOrders =NewList<order>            {                NewOrder {OrderId=1, Suppliers=NewList<supplier>                    {                        NewSupplier {supplierid= One, products=NewList<product>                        {                            NewProduct {productid=111, quantity=1, unitprice=Ten },                            NewProduct {ProductId = the, Quantity =1, UnitPrice = - }                        } },                        NewSupplier {SupplierId = A, products =NewList<product>                        {                            NewProduct {ProductId =113, Quantity =2, unitprice= - },                            NewProduct {productid= the, quantity=1, unitprice= - }                        } }                    }                }            }; varsuppliers = orders. Select (t =t.suppliers); varProducttotalprice = suppliers. Sum (t = t.sum (p = p.products.sum (o = o.quantity *( O.unitprice)));            Console.WriteLine (Producttotalprice);        Console.readkey (); }

Evaluates all collection elements under the collection of a collection