策略模式 StrategyPattern

最新推荐文章于 2025-09-05 16:52:13 发布

最新推荐文章于 2025-09-05 16:52:13 发布 · 58 阅读

本文介绍了一种软件设计模式——策略模式的实际应用案例。通过定义一系列的算法，并将每个算法封装起来，使它们可以互相替换。策略模式让算法独立于使用它的客户而变化。

interface flyBehavior { void fly(); }

策略接口A

using System; using System.Text; class flyBySocket : flyBehavior { #region flyBehavior 成员 public void fly() { Console.WriteLine("I can fly by socket!"); } #endregion }

策略接口A的实现A

using System; class flyByWater : flyBehavior { #region flyBehavior 成员 public void fly() { Console.WriteLine("i can fly by water"); } #endregion }

策略接口A的实现B

using System; class NormalFly : flyBehavior { #region flyBehavior 成员 public void fly() { Console.WriteLine("my fly skill is normal!"); } #endregion }

策略接口A的实现C

interface quackBehavior { void quack(); }

策略接口B

using System; class NormalQuack : quackBehavior { #region quackBehavior 成员 public void quack() { Console.WriteLine("I can quack,but my voice is very small!"); } #endregion }

策略接口B的实现A

using System; using System.Text; class cantQuack : quackBehavior { #region quackBehavior 成员 public void quack() { Console.WriteLine("I can't quack!"); } #endregion }

策略接口B的实现B

using System; using System.Text; abstract class duck { protected flyBehavior _flyBehavior; protected quackBehavior _quackBehavior; public abstract void display(); public void fly() { _flyBehavior.fly(); } public void quack() { _quackBehavior.quack(); } }

策略调用者抽象

using System; using System.Text; class MachinalDuck:duck { public MachinalDuck(flyBehavior flyBehavior, quackBehavior quackBehavior) { base._flyBehavior = flyBehavior; base._quackBehavior = quackBehavior; } public override void display() { Console.WriteLine("Im a beautiful MachinalDuck!!!"); } }

策略调用者A

using System; class NormalDuck : duck { public NormalDuck(flyBehavior flyBehav, quackBehavior quackBehav) { _flyBehavior = flyBehav; _quackBehavior = quackBehav; } public override void display() { Console.WriteLine("Im a beautiful NormalDuck!"); } }

策略调用者B

using System; using System.Collections.Generic; using System.Text; namespace DesignPattern { class Program { static void Main(string[] args) { //flyBehavior flyBehav = new flyBySocket(); flyBehavior flyBehav = new flyByWater(); quackBehavior quackBehav = new cantQuack(); duck MachinalDuck = new MachinalDuck(flyBehav, quackBehav); MachinalDuck.display(); MachinalDuck.fly(); MachinalDuck.quack(); //flyBehav = new NormalFly(); //quackBehav = new NormalQuack(); //duck normalDuck = new NormalDuck(flyBehav, quackBehav); //normalDuck.display(); //normalDuck.fly(); //normalDuck.quack(); Console.ReadKey(); } } }

调用者