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自從有了html與http，就有了瀏覽器與Web服務器，并有了Web應用，最初的交互模式是這樣的：

創(chuàng)新互聯(lián)建站-專業(yè)網(wǎng)站定制、快速模板網(wǎng)站建設、高性價比大邑縣網(wǎng)站開發(fā)、企業(yè)建站全套包干低至880元,成熟完善的模板庫,直接使用。一站式大邑縣網(wǎng)站制作公司更省心,省錢,快速模板網(wǎng)站建設找我們，業(yè)務覆蓋大邑縣地區(qū)。費用合理售后完善，十余年實體公司更值得信賴。

該模式很好地運行了很多年。然而，隨著計算機應用的發(fā)展，人們越來越不滿足于只有靜態(tài)內容的頁面，而由某種機制動態(tài)產生html等代碼的需求越來越迫切，于是，很多技術就應運而生，ASP.NET就是這樣一種技術。從本質上講，ASP.NET就是一種服務器端動態(tài)產生html、css、javascript等瀏覽器認識的代碼的技術。ASP.NET的交互模式如下：

由該圖可知，ASP.NET必須解決兩大問題，一是如何與Web服務器（一般就是指IIS）進行交互，二是如何根據(jù)不同請求產生不同的html等代碼。

***個問題，根據(jù)IIS版本（5.*，6.0，7.0）的不同，ASP.NET具有不同的進程模式與不同的交互模式，該問題不是本篇要講述的。一般來說，大家不必關心該問題，而且要了解該問題，又必須清楚IIS各個版本的模型，而各個版本又各有各的不同，因此，我基本不準備講述這個問題，大家有興趣的話，可以自行搜索相關資料。

我們來討論第二個問題，這里首先要說明的是，因為IIS7.0進程模式的變化比較大，我也沒去了解IIS7.0的模型，因此，以下講述及以后講述將只針對IIS5.*與IIS6.0。我們有理由認為，針對IIS5.*與IIS6.0的講述一般同樣適用于IIS7.0。

先且按下該問題不表，我們來看一段請求玉帝把大象放到冰箱里的代碼（為什么不是上帝？因為我中華不歸上帝管），請大家先跟著我的思路來，別急，別急。

   using System;

namespace ConsoleApplication3
11_Open_Text').style.display='none'; document.getElementById('Codehighlighter1_45_2811_Closed_Image').style.display='inline'; document.getElementById('Codehighlighter1_45_2811_Closed_Text').style.display='inline';" src="/files/uploadimg/20090423/1047402.gif" align=top>[[2179]][[2180]]{
[[2181]]    class Program
[[2182]][[2183]]    [[2180]]{
[[2181]]        static void Main(string[] args)
[[2182]][[2183]]        [[2180]]{
[[2181]]            Emperor emperor = new Emperor();
[[2181]]            while (true)
[[2182]][[2183]]            [[2180]]{
[[2181]]                Console.WriteLine("首先給玉帝準備好大象和冰箱。");
[[2181]]
[[2181]]                Console.WriteLine("輸入大象的名字：");
[[2181]]                string elephantName = Console.ReadLine();
[[2181]]                Console.WriteLine("輸入大象的體重：");
[[2181]]                int elephantWeight = int.Parse(Console.ReadLine());
[[2181]]                Console.WriteLine("輸入冰箱的名字：");
[[2181]]                string refrigeratorName = Console.ReadLine();
[[2181]]
[[2181]]                Elephant elephant = new Elephant()
[[2182]][[2183]]                [[2180]]{
[[2181]]                    Name = elephantName,
[[2181]]                    Weight = elephantWeight
[[2184]]                };
[[2181]]                Refrigerator refrigerator = new Refrigerator()
[[2182]][[2183]]                [[2180]]{
[[2181]]                    Name = refrigeratorName
[[2184]]                };
[[2181]]
[[2181]]                Context context = new Context()
[[2182]][[2183]]                [[2180]]{
[[2181]]                    Elephant = elephant,
[[2181]]                    Refrigerator = refrigerator
[[2184]]                };
[[2181]]
[[2181]]                emperor.ProcessRequest(context);
[[2181]]
[[2181]]                Console.WriteLine("是否要玉帝繼續(xù)把大象關進冰箱里？");
[[2181]]                string answer = Console.ReadLine();
                if (answer == "n")
                    break;
           }
[[2184]]        }
    }

    class Emperor
    {
[[2181]]        public void ProcessRequest(Context context)
[[2182]][[2183]]        {
[[2181]]            Elephant elephant = context.Elephant;
[[2181]]            Refrigerator refrigerator = context.Refrigerator;
[[2181]]
[[2181]]            //***步，打開冰箱門
[[2181]]            refrigerator.IsOpen = true;
[[2181]]            Console.WriteLine(string.Format("玉帝打開了 {0} 的冰箱門。", refrigerator.Name));
[[2181]]
[[2181]]            //第二步，把大象放進去
[[2181]]            refrigerator.Content = elephant;
[[2181]]            Console.WriteLine(string.Format("玉帝把大象 {0} 放到冰箱 {1} 里了。", elephant.Name, refrigerator.Name));
[[2181]]
[[2181]]            //第三步，關上冰箱門
[[2181]]            refrigerator.IsOpen = false;
[[2181]]            Console.WriteLine(string.Format("玉帝關上了 {0} 的冰箱門。", refrigerator.Name));
[[2184]]        }
[[2184]]    }
[[2181]]
[[2181]]    class Elephant
[[2182]][[2183]]    [[2180]]{
[[2182]][[2183]]        public string Name [[2180]]{ get; set; }
[[2182]][[2183]]        public int Weight[[2180]]{ get; set; }
[[2184]]    }
[[2181]]
[[2181]]    class Refrigerator
[[2182]][[2183]]    [[2180]]{
[[2182]][[2183]]        public string Name { get; set; }
[[2182]][[2183]]        public bool IsOpen { get; set; }
[[2181]]
[[2181]]        private object m_Content;
[[2181]]        public object Content
[[2182]][[2183]]        {
[[2182]][[2183]]            get { return this.m_Content; }
[[2181]]            set
[[2182]][[2183]]            {
[[2181]]                if (!this.IsOpen)
[[2181]]                    throw new InvalidOperationException("冰箱門未打開，無法放進東西。");
[[2181]]                if (this.m_Content != null)
[[2181]]                    throw new InvalidOperationException("冰箱內有東西，無法放進新的東西。");
[[2181]]
[[2181]]                this.m_Content = value;
[[2184]]            }
[[2184]]        }
[[2184]]    }
[[2181]]
[[2181]]    class Context
[[2182]][[2183]]    [[2180]]{
[[2182]][[2183]]        public Elephant Elephant [[2180]]{ get; set; }
[[2182]][[2183]]        public Refrigerator Refrigerator [[2180]]{ get; set; }
[[2184]]    }
[[2185]]}

請大家先認真讀懂該代碼，該代碼不會有問題吧，如果有問題，那么還請你一定先讀懂該代碼再往下看。

后來，玉帝累了，他想啊，我堂堂玉帝，居然親自干這種沒含量的活，但是顧客是玉帝的玉帝，又不能不干。于是，玉帝找了兩個手下（把門大神、神象星宿）來幫他干活。

_Text_112146').style.display='none'; document.getElementById('Code_Open_Image_112146').style.display='inline'; document.getElementById('Code_Open_Text_112146').style.display='inline';" height=16 src="/files/uploadimg/20090423/1047403.gif" width=11 align=top>[[2186]]Code2
 using System;
using System.Collections.Generic;

namespace ConsoleApplication3
[[2186]][[2179]][[2180]]{
[[2181]]    class Program
[[2182]][[2183]]    [[2180]]{
[[2181]]        static void Main(string[] args)
[[2182]][[2183]]        [[2180]]{
[[2181]]            Emperor emperor = new Emperor();
[[2181]]            emperor.Init();
[[2181]]
[[2181]]            while (true)
[[2182]][[2183]]            [[2180]]{
[[2181]]                Console.WriteLine("首先給玉帝準備好大象和冰箱。");
[[2181]]
[[2181]]                Console.WriteLine("輸入大象的名字：");
[[2181]]                string elephantName = Console.ReadLine();
[[2181]]                Console.WriteLine("輸入大象的體重：");
[[2181]]                int elephantWeight = int.Parse(Console.ReadLine());
[[2181]]                Console.WriteLine("輸入冰箱的名字：");
[[2181]]                string refrigeratorName = Console.ReadLine();
[[2181]]
[[2181]]                Elephant elephant = new Elephant()
[[2182]][[2183]]                [[2180]]{
[[2181]]                    Name = elephantName,
[[2181]]                    Weight = elephantWeight
[[2184]]                };
[[2181]]                Refrigerator refrigerator = new Refrigerator()
[[2182]][[2183]]                [[2180]]{
[[2181]]                    Name = refrigeratorName
[[2184]]                };
[[2181]]
[[2181]]                Context context = new Context()
[[2182]][[2183]]                [[2180]]{
[[2181]]                    Elephant = elephant,
[[2181]]                    Refrigerator = refrigerator
[[2184]]                };
[[2181]]
[[2181]]                emperor.ProcessRequest(context);
[[2181]]
[[2181]]                Console.WriteLine("是否要玉帝繼續(xù)把大象關進冰箱里？");
[[2181]]                string answer = Console.ReadLine();
[[2181]]                if (answer == "n")
[[2181]]                    break;
[[2184]]            }
[[2184]]        }
[[2184]]    }
[[2181]]
[[2181]]    class Emperor
[[2182]][[2183]]    [[2180]]{
[[2181]]        private IList m_Modules;
[[2182]][[2183]]        public Context Context [[2180]]{ get; set; }
[[2181]]
[[2181]]        public void Init()
[[2182]][[2183]]        [[2180]]{
[[2181]]            m_Modules = new List();
[[2181]]            m_Modules.Add(new OpenCloseRefrigeratorDoorModule());
[[2181]]            m_Modules.Add(new PutElephantToRefrigeratorModule());
[[2181]]
[[2181]]            foreach (IEmperorModule module in this.m_Modules)
[[2182]][[2183]]            [[2180]]{
[[2181]]                module.Init(this);
[[2184]]            }
[[2184]]        }
[[2181]]
[[2181]]        public void ProcessRequest(Context context)
[[2182]][[2183]]        [[2180]]{
[[2181]]            this.Context = context;
[[2181]]
[[2181]]            this.OnOpenRefrigeratorDoor();
[[2181]]            this.OnPutElephantToRefrigerator();
[[2181]]            this.OnCloseRefrigeratorDoor();
[[2184]]        }
[[2181]]
[[2181]]        public event EventHandler OpenRefrigeratorDoor;
[[2181]]        public event EventHandler PutElephantToRefrigerator;
[[2181]]        public event EventHandler CloseRefrigeratorDoor;
[[2181]]
[[2181]]        protected virtual void OnOpenRefrigeratorDoor()
[[2182]][[2183]]        [[2180]]{
[[2181]]            EventHandler handler = this.OpenRefrigeratorDoor;
[[2181]]            if (handler != null)
[[2182]][[2183]]            [[2180]]{
[[2181]]                handler(this, EventArgs.Empty);
[[2184]]            }
[[2184]]        }
[[2181]]
[[2181]]        protected virtual void OnPutElephantToRefrigerator()
[[2182]][[2183]]        [[2180]]{
[[2181]]            EventHandler handler = this.PutElephantToRefrigerator;
[[2181]]            if (handler != null)
[[2182]][[2183]]            [[2180]]{
[[2181]]                handler(this, EventArgs.Empty);
[[2184]]            }
[[2184]]        }
[[2181]]
[[2181]]        protected virtual void OnCloseRefrigeratorDoor()
[[2182]][[2183]]        [[2180]]{
[[2181]]            EventHandler handler = this.CloseRefrigeratorDoor;
[[2181]]            if (handler != null)
[[2182]][[2183]]            [[2180]]{
[[2181]]                handler(this, EventArgs.Empty);
[[2184]]            }
[[2184]]        }
[[2184]]    }
[[2181]]
[[2181]]    class Elephant
[[2182]][[2183]]    [[2180]]{
[[2182]][[2183]]        public string Name [[2180]]{ get; set; }
[[2182]][[2183]]        public int Weight[[2180]]{ get; set; }
[[2184]]    }
[[2181]]
[[2181]]    class Refrigerator
[[2182]][[2183]]    [[2180]]{
[[2182]][[2183]]        public string Name [[2180]]{ get; set; }
[[2182]][[2183]]        public bool IsOpen [[2180]]{ get; set; }
[[2181]]
[[2181]]        private object m_Content;
[[2181]]        public object Content
[[2182]][[2183]]        [[2180]]{
[[2182]][[2183]]            get [[2180]]{ return this.m_Content; }
[[2181]]            set
[[2182]][[2183]]            [[2180]]{
[[2181]]                if (!this.IsOpen)
[[2181]]                    throw new InvalidOperationException("冰箱門未打開，無法放進東西。");
[[2181]]                if (this.m_Content != null)
[[2181]]                    throw new InvalidOperationException("冰箱內有東西，無法放進新的東西。");
[[2181]]
[[2181]]                this.m_Content = value;
[[2184]]            }
[[2184]]        }
[[2184]]    }
[[2181]]
[[2181]]    class Context
[[2182]][[2183]]    [[2180]]{
[[2182]][[2183]]        public Elephant Elephant [[2180]]{ get; set; }
[[2182]][[2183]]        public Refrigerator Refrigerator [[2180]]{ get; set; }
[[2184]]    }
[[2181]]
[[2181]]    interface IEmperorModule
[[2182]][[2183]]    [[2180]]{
[[2181]]        void Init(Emperor emperor);
[[2184]]    }
[[2181]]
[[2181]]    class OpenCloseRefrigeratorDoorModule : IEmperorModule
[[2182]][[2183]]    [[2180]]{
[[2183]][[2182]]        IEmperorModule 成員#region IEmperorModule 成員
[[2181]]        public void Init(Emperor emperor)
[[2182]][[2183]]        [[2180]]{
[[2181]]            emperor.OpenRefrigeratorDoor += new EventHandler(this.OpenDoor);
[[2181]]            emperor.CloseRefrigeratorDoor += new EventHandler(this.CloseDoor);
[[2184]]        }
[[2184]]        #endregion
[[2181]]
[[2181]]        private void OpenDoor(object sender, EventArgs e)
[[2182]][[2183]]        [[2180]]{
[[2181]]            Emperor emperor = (Emperor)sender;
[[2181]]            Refrigerator refrigerator = emperor.Context.Refrigerator;
[[2181]]            refrigerator.IsOpen = true;
[[2181]]            Console.WriteLine(string.Format("玉帝的把門大神打開了 {0} 的冰箱門。", refrigerator.Name));
[[2184]]        }
[[2181]]
[[2181]]        private void CloseDoor(object sender, EventArgs e)
[[2182]][[2183]]        [[2180]]{
[[2181]]            Emperor emperor = (Emperor)sender;
[[2181]]            Refrigerator refrigerator = emperor.Context.Refrigerator;
[[2181]]            refrigerator.IsOpen = false;
[[2181]]            Console.WriteLine(string.Format("玉帝的把門大神關上了 {0} 的冰箱門。", refrigerator.Name));
[[2184]]        }
[[2184]]    }
[[2181]]
[[2181]]    class PutElephantToRefrigeratorModule : IEmperorModule
[[2182]][[2183]]    [[2180]]{
[[2183]][[2182]]        IEmperorModule 成員#region IEmperorModule 成員
[[2181]]        public void Init(Emperor emperor)
[[2182]][[2183]]        [[2180]]{
[[2181]]            emperor.PutElephantToRefrigerator += new EventHandler(this.PutElephantToRefrigerator);
[[2184]]        }
[[2184]]        #endregion
[[2181]]
[[2181]]        private void PutElephantToRefrigerator(object sender, EventArgs e)
[[2182]][[2183]]        [[2180]]{
[[2181]]            Emperor emperor = (Emperor)sender;
[[2181]]            Elephant elephant = emperor.Context.Elephant;
[[2181]]            Refrigerator refrigerator = emperor.Context.Refrigerator;
[[2181]]            refrigerator.Content = elephant;
[[2181]]            Console.WriteLine(string.Format("玉帝的神象星宿把大象 {0} 放到冰箱 {1} 里了。", elephant.Name, refrigerator.Name));
[[2184]]        }
[[2184]]    }
[[2185]]}

觀測該代碼有哪些變化？玉帝增加了一個Init方法，該方法召集了那些干活的手下，并交待手下你們要干的事情（初始化）。所有手下都繼承自IEmperorModule接口，該接口有一個Init方法，以初始化該手下能干的活。玉帝的ProcessRequest方法不再親自干活了，而僅僅是在那邊喊，該開門了，該把大象放進去了，該關門了。

來點題外話，上面代碼應用了模板方法模式，或者說是模板方法的變種。什么，不是，沒有抽象類，沒有抽象方法，沒有子類？請問，模板方法一定要有抽象類嗎？一定要有抽象方法嗎？一定要有子類嗎？我想，模板方法的精髓，在于它規(guī)定了特定的步驟算法，而這些步驟在必要的時候可以委托給其它方法實現(xiàn)。在傳統(tǒng)的模板方法中，是委托給子類實現(xiàn)，而在我們擁有委托的情況下，難道我們不能委托給其它類實現(xiàn)嗎？其實，我想，學習設計模式，不要拘泥于形式，而要掌握其精髓，并靈活運用。就Gof的23種設計模式來說，我覺得其精髓幾乎全部可由一句話概括。）

天有不測風云，人有旦夕禍福，某一天，這神象星宿病了，他趕不動超過1000斤的大象了，怎么辦？玉帝于是又召集了超級神象星宿，可但凡有點能耐的都有點脾氣，超級神象星宿表示，只有其它人趕不動的大象他才來趕。

[[2179]][[2186]]Code3
 using System;
using System.Collections.Generic;

namespace ConsoleApplication3
[[2186]][[2179]][[2180]]{
[[2181]]    class Program
[[2182]][[2183]]    [[2180]]{
[[2181]]        static void Main(string[] args)
[[2182]][[2183]]        [[2180]]{
[[2181]]            Emperor emperor = new Emperor();
[[2181]]            emperor.Init();
[[2181]]
[[2181]]            while (true)
[[2182]][[2183]]            [[2180]]{
[[2181]]                Console.WriteLine("首先給玉帝準備好大象和冰箱。");
[[2181]]
[[2181]]                Console.WriteLine("輸入大象的名字：");
[[2181]]                string elephantName = Console.ReadLine();
[[2181]]                Console.WriteLine("輸入大象的體重：");
[[2181]]                int elephantWeight = int.Parse(Console.ReadLine());
[[2181]]                Console.WriteLine("輸入冰箱的名字：");
[[2181]]                string refrigeratorName = Console.ReadLine();
[[2181]]
[[2181]]                Elephant elephant = new Elephant()
[[2182]][[2183]]                [[2180]]{
[[2181]]                    Name = elephantName,
[[2181]]                    Weight = elephantWeight
[[2184]]                };
[[2181]]                Refrigerator refrigerator = new Refrigerator()
[[2182]][[2183]]                [[2180]]{
[[2181]]                    Name = refrigeratorName
[[2184]]                };
[[2181]]
[[2181]]                Context context = new Context()
[[2182]][[2183]]                [[2180]]{
[[2181]]                    Elephant = elephant,
[[2181]]                    Refrigerator = refrigerator
[[2184]]                };
[[2181]]
[[2181]]                emperor.ProcessRequest(context);
[[2181]]
[[2181]]                Console.WriteLine("是否要玉帝繼續(xù)把大象關進冰箱里？");
[[2181]]                string answer = Console.ReadLine();
[[2181]]                if (answer == "n")
[[2181]]                    break;
[[2184]]            }
[[2184]]        }
[[2184]]    }
[[2181]]
[[2181]]    class Emperor
[[2182]][[2183]]    [[2180]]{
[[2181]]        private IList m_Modules;
[[2182]][[2183]]        public Context Context [[2180]]{ get; set; }
[[2181]]
[[2181]]        public void Init()
[[2182]][[2183]]        [[2180]]{
[[2181]]            m_Modules = new List();
[[2181]]            m_Modules.Add(new OpenCloseRefrigeratorDoorModule());
[[2181]]            m_Modules.Add(new PutElephantToRefrigeratorModule());
[[2181]]            m_Modules.Add(new SuperPutElephantToRefrigeratorModule());
[[2181]]
[[2181]]            foreach (IEmperorModule module in this.m_Modules)
[[2182]][[2183]]            [[2180]]{
[[2181]]                module.Init(this);
[[2184]]            }
[[2184]]        }
[[2181]]
[[2181]]        public void ProcessRequest(Context context)
[[2182]][[2183]]        [[2180]]{
[[2181]]            this.Context = context;
[[2181]]
[[2181]]            this.OnOpenRefrigeratorDoor();
[[2181]]            this.OnPutElephantToRefrigerator();
[[2181]]            this.OnCloseRefrigeratorDoor();
[[2184]]        }
[[2181]]
[[2181]]        public event EventHandler OpenRefrigeratorDoor;
[[2181]]        public event EventHandler PutElephantToRefrigerator;
[[2181]]        public event EventHandler CloseRefrigeratorDoor;
[[2181]]
[[2181]]        protected virtual void OnOpenRefrigeratorDoor()
[[2182]][[2183]]        [[2180]]{
[[2181]]            EventHandler handler = this.OpenRefrigeratorDoor;
[[2181]]            if (handler != null)
[[2182]][[2183]]            [[2180]]{
[[2181]]                handler(this, EventArgs.Empty);
[[2184]]            }
[[2184]]        }
[[2181]]
[[2181]]        protected virtual void OnPutElephantToRefrigerator()
[[2182]][[2183]]        [[2180]]{
[[2181]]            EventHandler handler = this.PutElephantToRefrigerator;
[[2181]]            if (handler != null)
[[2182]][[2183]]            [[2180]]{
[[2181]]                handler(this, EventArgs.Empty);
[[2184]]            }
[[2184]]        }
[[2181]]
[[2181]]        protected virtual void OnCloseRefrigeratorDoor()
[[2182]][[2183]]        [[2180]]{
[[2181]]            EventHandler handler = this.CloseRefrigeratorDoor;
[[2181]]            if (handler != null)
[[2182]][[2183]]            [[2180]]{
[[2181]]                handler(this, EventArgs.Empty);
[[2184]]            }
[[2184]]        }
[[2184]]    }
[[2181]]
[[2181]]    class Elephant
[[2182]][[2183]]    [[2180]]{
[[2182]][[2183]]        public string Name [[2180]]{ get; set; }
[[2182]][[2183]]        public int Weight[[2180]]{ get; set; }
[[2184]]    }
[[2181]]
[[2181]]    class Refrigerator
[[2182]][[2183]]    [[2180]]{
[[2182]][[2183]]        public string Name [[2180]]{ get; set; }
[[2182]][[2183]]        public bool IsOpen [[2180]]{ get; set; }
[[2181]]
[[2181]]        private object m_Content;
[[2181]]        public object Content
[[2182]][[2183]]        [[2180]]{
[[2182]][[2183]]            get [[2180]]{ return this.m_Content; }
[[2181]]            set
[[2182]]Id('Codehighlighter1_3485_3771_Closed_Text').style.display='none'; document.getElementById('Codehighlighter1_3485_3771_Open_Image').style.display='inline'; document.getElementById('Codehighlighter1_3485_3771_Open_Text').style.display='inline';" src="/files/uploadimg/20090423/1047407.gif" align=top>            [[2180]]{
[[2181]]                if (!this.IsOpen)
[[2181]]                    throw new InvalidOperationException("冰箱門未打開，無法放進東西。");
[[2181]]                if (this.m_Content != null)
[[2181]]                    throw new InvalidOperationException("冰箱內有東西，無法放進新的東西。");
[[2181]]
[[2181]]                this.m_Content = value;
[[2184]]            }
[[2184]]        }
[[2184]]    }
[[2181]]
[[2181]]    class Context
[[2182]][[2183]]    [[2180]]{
[[2182]][[2183]]        public Elephant Elephant [[2180]]{ get; set; }
[[2182]][[2183]]        public Refrigerator Refrigerator [[2180]]{ get; set; }
[[2181]]
[[2181]]        private IDictionary m_Items;
[[2181]]        public IDictionary Items
[[2182]][[2183]]        [[2180]]{
[[2181]]            get
[[2182]][[2183]]             none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">[[2180]]{
[[2181]]                if (this.m_Items == null)
[[2181]]    &n                                                

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