proxystructural.cs

来自「使用C#程序将23个常用设计模式进行列表显示」· CS 代码 · 共 53 行

using System;
using System.Windows.Forms;
using System.Text;

namespace DesignPattern.ProxyStructural
{
    class ProxyStructural : AbstractPattern
    {
        public static void Run(TextBox tbInfo)
        {
            s_tbInfo = tbInfo;
            s_tbInfo.Text = "";

            // 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()
        {
            DesignPattern.FormMain.OutputInfo("Called RealSubject.Request()"); 
        }
    }
    
    // "Proxy" 
    class Proxy : Subject 
    {
        RealSubject realSubject; 
        public override void Request()
        {
            // Use 'lazy initialization' 
            if (realSubject == null) 
            {
                realSubject = new RealSubject(); 
            }
            realSubject.Request(); 
        }
    }
}