class1.cs

来自DoFactory的设计模式, 由于是本人根据已有代码创建,没有NETOptimized项

// Proxy pattern -- Structural example  

using System;

namespace DoFactory.GangOfFour.Proxy.Structural
{

    // MainApp test application 

    class MainApp
    {
        static void Main()
        {
            // Create proxy and request a service 
            Proxy proxy = new Proxy();
            proxy.Request();

            // Wait for user 
            Console.Read();
        }
    }

    // "Subject" 

    abstract class Subject
    {
        public abstract void Request();
    }

    // "RealSubject" 

    class RealSubject : Subject
    {
        public override void Request()
        {
            Console.WriteLine("Called RealSubject.Request()");
        }
    }

    // "Proxy" 

    class Proxy : Subject
    {
        RealSubject realSubject;

        public override void Request()
        {
            // Use 'lazy initialization' 
            if (realSubject == null)
            {
                realSubject = new RealSubject();
            }

            realSubject.Request();
        }
    }
}