Design Pattern Series-Decorative mode

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;//Decorative Mode Demonamespacediscountapplication2{classProgram {Static voidMain (string[] args) {            //Preferential Scheme OneOrder Order1 =NewOrder (); Order1. Goodstotal= -; OrderDiscount OrderDiscount=NewOrderDiscount (); Applyfullreductiondiscount D1=NewApplyfullreductiondiscount ( -,Ten); ApplyDiscount D2=NewApplyDiscount (0.95, 200m); ApplyDiscount D3=NewApplyDiscount (0.8); Console.WriteLine ("\ n Preferential scheme one"); D1.            Setdiscountobject (OrderDiscount); D2.            Setdiscountobject (D1); D3.            Setdiscountobject (D2); D3.            Execute (Order1); //Preferential Scheme twoOrder Order2 =NewOrder (); Order2. Goodstotal= Max; OrderDiscount OrderDiscount2=NewOrderDiscount (); Applyfullreductiondiscount K1=NewApplyfullreductiondiscount ( -,9.9m); ApplyDiscount K2=NewApplyDiscount (0.98, 199m); ApplyDiscount K3=NewApplyDiscount (0.88); Console.WriteLine ("\ n Preferential scheme two"); K1.            Setdiscountobject (OrderDiscount2); K3.            Setdiscountobject (K1); K2.            Setdiscountobject (K3); K2.            Execute (ORDER2);        Console.readkey (); }    }     Public classOrder {/// <summary>        ///total value of goods/// </summary>         Public decimalgoodstotal{Get;Set;} /// <summary>        ///deduction of discount, final customer to pay amount/// </summary>         Public decimalgrandtotal{Get;Set;} }     Public InterfaceIorderdiscount {voidExecute (order order); }     Public classOrderdiscount:iorderdiscount { Public voidExecute (Order order) {Console.WriteLine ("The original price is {0}", order.        Goodstotal.toroundstring ()); }    }     Public Abstract classDiscountbase:iorderdiscount {PrivateIorderdiscount Discount =NULL;  Public  voidsetdiscountobject (iorderdiscount discount) { This. Discount =discount; }         Public Virtual voidExecute (Order order) {if(Discount! =NULL) {discount.            Execute (order); }        }    }      //Full reduction offer     Public classApplyfullreductiondiscount:discountbase {Private decimalFullmoney =decimal.        Zero; Private decimalReductionmoney =decimal.        Zero;  PublicApplyfullreductiondiscount (decimalFullmoney,decimalReductionmoney) {             This. Fullmoney =Fullmoney;  This. Reductionmoney =Reductionmoney; }         Public Override voidExecute (Order order) {Base.            Execute (order); if(Order. Goodstotal >=Fullmoney) {Order. Goodstotal= order. Goodstotal-Reductionmoney; Console.WriteLine ("{ 2} amount after {0} minus {1}", This. Fullmoney, This. Reductionmoney, order.                Goodstotal.toroundstring ()); return; } Console.WriteLine ("condition not satisfied, cannot use offer with {0} minus {1}", This. Fullmoney, This. Reductionmoney); }    }    //Discounted Rates     Public classApplydiscount:discountbase {Private DoubleDiscountRate =1d; Private decimal? Moneycondition =NULL; PrivateOrder order =NULL;  PublicApplyDiscount (DoubleDiscountRate,decimal?moneycondition) {             This. DiscountRate =discountrate;  This. moneycondition =moneycondition; }         PublicApplyDiscount (Doublediscountrate): This(DiscountRate,NULL)        {        }         Public Override voidExecute (Order order) { This. Order =order; Base. Execute ( This. order); if( This. moneycondition! =NULL)            {                if( This. Order. Goodstotal >= This. Moneycondition.value) {                     This.                Executediscount (); }                Else{Console.WriteLine ("The condition is not satisfied, the amount is not full {0}, cannot meet the discount of {1} discount", This. moneyCondition.Value.ToRoundString (), This. discountrate); return; }            }            Else            {                 This.            Executediscount (); } Console.WriteLine ("{1} after the {0} discount is hit", This. DiscountRate, order.        Goodstotal.toroundstring ()); }        Private voidExecutediscount () { This. Order. Goodstotal = This. Order. Goodstotal * (decimal) This. DiscountRate; }    }    //Extending the decimal type     Public Static classDecimalextend { Public Static stringToroundstring ( This decimald) {returnMath.Round (D,2, Midpointrounding.toeven). ToString ("F2"); }    }}

Design Pattern Series-Decorative mode