代理模式 原型模式

代理模式：为其他对象提供一种代理，以控制对这个对象的访问。

 

    class Program    {        static void Main(string[] args)        {            Proxy proxy = new Proxy();            proxy.Request();            Console.Read();        }    }    abstract class Subject    {        public abstract void Request();    }    class RealSubject : Subject    {        public override void Request()        {            Console.WriteLine("真实的请求");        }    }    class Proxy : Subject    {        RealSubject realSubject;        public override void Request()        {            if (realSubject == null)            {                realSubject = new RealSubject();            }            realSubject.Request();        }    }

 

 

原型模式：用原型实例指定创建对象的种类，并通过拷贝这些原型创建新的对象。

另外，注意浅拷贝和深拷贝

    class Program    {        static void Main(string[] args)        {            ConcretePrototype1 p1 = new ConcretePrototype1("I");            ConcretePrototype1 c1 = (ConcretePrototype1)p1.Clone();            Console.WriteLine("Cloned: {0}", c1.Id);            ConcretePrototype2 p2 = new ConcretePrototype2("II");            ConcretePrototype2 c2 = (ConcretePrototype2)p2.Clone();            Console.WriteLine("Cloned: {0}", c2.Id);            // Wait for user             Console.Read();        }    }    abstract class Prototype    {        private string id;        // Constructor         public Prototype(string id)        {            this.id = id;        }        // Property         public string Id        {            get { return id; }        }        public abstract Prototype Clone();    }    class ConcretePrototype1 : Prototype    {        // Constructor         public ConcretePrototype1(string id)            : base(id)        {        }        public override Prototype Clone()        {            // Shallow copy             return (Prototype)this.MemberwiseClone();        }    }    class ConcretePrototype2 : Prototype    {        // Constructor         public ConcretePrototype2(string id)            : base(id)        {        }        public override Prototype Clone()        {            // Shallow copy             return (Prototype)this.MemberwiseClone();        }    }