简单的设计模式

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这个是《大话设计模式》中的一些简单例子，
简单易懂，所以整理下来，方便大家查看。其实我们大多只要熟悉几种设计模式就好了。
public static void Main(string[] args)        {            //Test简单工厂();            //Test策略模式();            //Test装饰模式();            //Test代理模式();            //Test工厂方法();            Console.Read();        }        #region 模式-简单工厂        public abstract class Operation        {            public double NumA { get; set; }            public double NumB { get; set; }            public abstract double GetResult();        }        public class Add : Operation        {            public override double GetResult()            {                return NumA + NumB;            }        }        public class Mul : Operation        {            public override double GetResult()            {                return NumA - NumB;            }        }        public class OperationFactory        {            public static Operation CreateOperation(string operation)            {                Operation o = null;                switch (operation)                {                    case "+": o = new Add(); break;                    case "-": o = new Mul(); break;                }                return o;            }        }        public static void Test简单工厂()        {            Operation o = OperationFactory.CreateOperation("+");            o.NumA = double.Parse(Console.ReadLine());            o.NumB = double.Parse(Console.ReadLine());            double result = o.GetResult();            Console.WriteLine(result);        }        #endregion        #region 模式-策略模式        //抽象算法        public abstract class Strategy        {            //算法方法            public abstract void AlgorithmInterface();        }        public class ConcreteStrategyA : Strategy        {            public override void AlgorithmInterface()            {                Console.WriteLine("A");            }        }        public class ConcreteStrategyB : Strategy        {            public override void AlgorithmInterface()            {                Console.WriteLine("B");            }        }        public class ConcreteStrategyC : Strategy        {            public override void AlgorithmInterface()            {                Console.WriteLine("C");            }        }        public class Context        {            Strategy strategy = null;            public Context(Strategy strategy)            {                this.strategy=strategy;            }            public void ConcreteStrategy()            {                strategy.AlgorithmInterface();            }        }        public static void Test策略模式()        {            Context c = new Context(new ConcreteStrategyA());            c.ConcreteStrategy();            c = new Context(new ConcreteStrategyC());            c.ConcreteStrategy();        }        #endregion        #region 模式-装饰模式        abstract class Component        {            public abstract void Operation();        }        class ConcreteComponent : Component        {            public override void Operation()            {                Console.WriteLine("具体对象的操作");            }        }        abstract class Decorator : Component        {            protected Component component;            public void SetComponent(Component component)            {                this.component = component;            }            public override void Operation()            {                if (component != null)                {                    component.Operation();                }            }        }        class ConcreteDecoratorA : Decorator        {            private string addedState;            public override void Operation()            {                base.Operation();                addedState = "New State";                Console.WriteLine("具体装饰对象A的操作");            }        }        class ConcreteDecoratorB : Decorator        {            public override void Operation()            {                base.Operation();                AddBehavior();                Console.WriteLine("具体装饰对象B的操作");            }            public void AddBehavior()            {                             }        }        public static void Test装饰模式()        {            ConcreteComponent c = new ConcreteComponent();            ConcreteDecoratorA d1 = new ConcreteDecoratorA();            ConcreteDecoratorB d2 = new ConcreteDecoratorB();            d1.SetComponent(c);            d2.SetComponent(d1);            d2.Operation();        }        #endregion        #region 模式-代理模式        abstract class Subject        {            public abstract void Request();        }        class RealSubject : Subject        {            public override void Request()            {                Console.WriteLine("真实请求");            }        }        class Proxy : Subject        {            RealSubject realSubject;            public override void Request()            {                if (realSubject == null)                    realSubject = new RealSubject();                realSubject.Request();            }        }        public static void Test代理模式()        {            Proxy proxy = new Proxy();            proxy.Request();            Console.ReadLine();        }        #endregion        #region 模式-工厂方法        //沿用简单工厂抽象类        interface IFactory        {            Operation CreateOperation();        }        class AddFactory : IFactory        {            public Operation CreateOperation()            {                return new Add();            }        }        class MulFactory : IFactory        {            public Operation CreateOperation()            {                return new Mul();            }        }        public static void Test工厂方法()        {            IFactory operFactory = new AddFactory();            Operation oper = operFactory.CreateOperation();            oper.NumA = 1;            oper.NumB = 2;            double result = oper.GetResult();            Console.WriteLine(result);        }        #endregion        #region 模式-原型模式                #endregion
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