【C#设计模式(22)——策略模式(Stratege Pattern)】

前言

策略模式： 将每个算法封装在独立的可互换的策略类中，方便在运行时选择不同的算法。

代码

 //(抽象)支付策略public abstract class PaymentStrategy{public abstract void Play(double amount);}//支付策略： 银行卡支付public class BankCardPayment : PaymentStrategy{private string account = "6222800421153124288";private string password = "123456";public BankCardPayment(string account, string password){this.account = account;this.password = password;}public override void Play(double amount){Console.WriteLine($"You used your bank card account {account} to pay ${amount}.");}}//支付策略： 微信支付public class WeChatPayment : PaymentStrategy{private string username = "user1";private string password = "123456";public WeChatPayment(string username, string password){this.username = username;this.password = password;}public override void Play(double amount){Console.WriteLine($"You used your  WeChat account  {username}  to pay ${amount}.");}}//支付环境： 购物车public class ShoppingCart{private PaymentStrategy paymentStrategy;public void SetPaymentStrategy(PaymentStrategy paymentStrategy){this.paymentStrategy = paymentStrategy;}public void CheckOut(double amount){paymentStrategy.Play(amount);}}/** 行为型模式：Behavioral Pattern* 策略模式：Stratege Pattern*/internal class Program{static void Main(string[] args){ShoppingCart cart = new ShoppingCart();PaymentStrategy bankPay = new BankCardPayment("6222800421153000000","123456");cart.SetPaymentStrategy(bankPay);cart.CheckOut(10000);PaymentStrategy wechatPay = new WeChatPayment("asdfghjkl", "123456");cart.SetPaymentStrategy(wechatPay);cart.CheckOut(890.5);Console.ReadLine();}}

结果