为别人做嫁衣 代理模式
7.1 为别人做嫁衣!
7.2 没有代理的代码
namespace 代理模式 { class Program { static void Main(string[] args) { SchoolGirl jiaojiao = new SchoolGirl(); jiaojiao.Name = "李娇娇"; Pursuit zhuojiayi = new Pursuit(jiaojiao); zhuojiayi.GiveDolls(); zhuojiayi.GiveFlowers(); zhuojiayi.GiveChocolate(); Console.Read(); } } //追求者 class Pursuit { SchoolGirl mm; public Pursuit(SchoolGirl mm) { this.mm = mm; } public void GiveDolls() { Console.WriteLine(mm.Name + " 送你洋娃娃"); } public void GiveFlowers() { Console.WriteLine(mm.Name + " 送你鲜花"); } public void GiveChocolate() { Console.WriteLine(mm.Name + " 送你巧克力"); } } //被追求者 class SchoolGirl { private string name; public string Name { get { return name; } set { name = value; } } } }
7.3 只有代理的代码
namespace 代理模式 { class Program { static void Main(string[] args) { SchoolGirl jiaojiao = new SchoolGirl(); jiaojiao.Name = "李娇娇"; Proxy daili = new Proxy(jiaojiao); daili.GiveDolls(); daili.GiveFlowers(); daili.GiveChocolate(); Console.Read(); } } //代理人 class Proxy { SchoolGirl mm; public Proxy(SchoolGirl mm) { this.mm = mm; } public void GiveDolls() { Console.WriteLine(mm.Name + " 送你洋娃娃"); } public void GiveFlowers() { Console.WriteLine(mm.Name + " 送你鲜花"); } public void GiveChocolate() { Console.WriteLine(mm.Name + " 送你巧克力"); } } //被追求者 class SchoolGirl { private string name; public string Name { get { return name; } set { name = value; } } } }
7.4 符合实际的代码
namespace 代理模式 { class Program { static void Main(string[] args) { SchoolGirl jiaojiao = new SchoolGirl(); jiaojiao.Name = "李娇娇"; Proxy daili = new Proxy(jiaojiao); daili.GiveDolls(); daili.GiveFlowers(); daili.GiveChocolate(); Console.Read(); } } //送礼物 interface GiveGift { void GiveDolls(); void GiveFlowers(); void GiveChocolate(); } class Proxy : GiveGift { Pursuit gg; public Proxy(SchoolGirl mm) { gg = new Pursuit(mm); } public void GiveDolls() { gg.GiveDolls(); } public void GiveFlowers() { gg.GiveFlowers(); } public void GiveChocolate() { gg.GiveChocolate(); } } class Pursuit : GiveGift { SchoolGirl mm; public Pursuit(SchoolGirl mm) { this.mm = mm; } public void GiveDolls() { Console.WriteLine(mm.Name + " 送你洋娃娃"); } public void GiveFlowers() { Console.WriteLine(mm.Name + " 送你鲜花"); } public void GiveChocolate() { Console.WriteLine(mm.Name + " 送你巧克力"); } } class SchoolGirl { private string name; public string Name { get { return name; } set { name = value; } } } }
7.5 代理模式
为其它对象提供一种代理以控制对这个对象的访问,
namespace 代理模式 { class Program { static void Main(string[] args) { Proxy proxy = new Proxy(); proxy.Request(); Console.Read(); } } //定义RealSubject和Proxy的共用接口,这样就在任何使用RealSubject的地方都可以使用Proxy, abstract class Subject { public abstract void Request(); } //定义Proxy所代表的真实实体, class RealSubject : Subject { public override void Request() { Console.WriteLine("真实的请求"); } } //保存一个引用使得代理可以访问实体,并提供一个与Subject的接口相同的接口,这样代理就可以用来替代实体, class Proxy : Subject { RealSubject realSubject; public override void Request() { if (realSubject == null) realSubject = new RealSubject(); realSubject.Request(); } } }
7.6 代理模式的应用
代理模式应用场合:
1.远程代理,也就是为一个对象在不同的地址空间提供局部代表,这样可以隐藏一个对象存在于不同地址空间的事实,
2.虚拟代理,是根据需要创建开销很大的对象,通过它来存放实例化需要很长时间的真实对象,
3.安全代理,用来控制真实对象访问时的权限,
4.智能指引,是指当调用真实的对象时,代理处理另外一些事,
7.7 秀才让小六代其求婚