IOC實現(xiàn)：

IOC容器我們僅僅停留在知道上是不行的，我們要動手做印象對更深刻，那么我給大家看一個代碼，看看代碼中IOC容器的實現(xiàn)。

代碼實現(xiàn)：

創(chuàng)建一個類庫：

解決方案的類庫建立：

創(chuàng)建一個實體類：User：

[csharp]?view plaincopyprint?

<span?style="font-size:18px;">using?System;??

using?System.Collections.Generic;??

using?System.Text;??

??

namespace?Spring.Demo.Model??

{??

????///?<summary>??

????///?用戶類??

????///?</summary>??

????public?class?Users??

????{??

????????///?<summary>??

????????///?編號??

????????///?</summary>??

????????private?int?_oid;??

????????public?int?Oid??

????????{??

????????????get?{?return?_oid;?}??

????????????set?{?_oid?=?value;?}??

????????}??

??

????????///?<summary>??

????????///?姓名??

????????///?</summary>??

????????private?string?_name;??

????????public?string?Name??

????????{??

????????????get?{?return?_name;?}??

????????????set?{?_name?=?value;?}??

????????}??

??

????????///?<summary>??

????????///?性別??

????????///?</summary>??

????????private?string?_sex;??

????????public?string?Sex??

????????{??

????????????get?{?return?_sex;?}??

????????????set?{?_sex?=?value;?}??

????????}??

??

????????///?<summary>??

????????///?年齡??

????????///?</summary>??

????????private?int?_age;??

????????public?int?Age??

????????{??

????????????get?{?return?_age;?}??

????????????set?{?_age?=?value;?}??

????????}??

????}??

}</span>??

創(chuàng)建IUsers的接口：

[csharp]?view plaincopyprint?

<span?style="font-size:18px;">using?System;??

using?System.Collections.Generic;??

using?System.Text;??

namespace?Spring.Demo.Service??

{??

????public?interface?IUsers??

????{??

????????///?<summary>??

????????///?返回用戶的詳細信息的方法??

????????///?</summary>??

????????///?<returns></returns>??

????????string?GetUserInfo();??

????}??

}??

</span>??

創(chuàng)建一個實現(xiàn)IUsers接口的實現(xiàn)類：

[csharp]?view plaincopyprint?

<span?style="font-size:18px;">using?System;??

using?System.Collections.Generic;??

using?System.Text;??

using?Spring.Demo.Service;??

using?Spring.Demo.Model;??

??

namespace?Spring.Demo.Compontext??

{??

????public?class?UsersCompontents?:?IUsers??

????{??

????????public?UsersCompontents()??

????????{?}??

?

????????#region?獲取用戶信息??

????????public?string?GetUserInfo()??

????????{??

????????????Users?user?=?new?Users();??

????????????user.Oid?=?1;??

????????????user.Name?=?"Beniao";??

????????????user.Sex?=?"Boy";??

????????????user.Age?=?25;??

??

????????????return?string.Format("編號：{0}--->姓名：{1}--->性別：{2}--->年齡：{3}",??

????????????????user.Oid,??

????????????????user.Name,??

????????????????user.Sex,??

????????????????user.Age);??

????????}??

????????#endregion??

????}??

}</span>??

創(chuàng)建測試類：

[csharp]?view plaincopyprint?

<span?style="font-size:18px;">using?ITOO.Library.Core.AOP;??

using?Spring.Context;??

using?Spring.Demo.Service;??

using?System;??

using?System.Collections.Generic;??

using?System.Configuration;??

using?System.Linq;??

using?System.Text;??

??

namespace?Sping.Demo.SimpleTest??

{??

????class?Program??

????{??

????????static?void?Main(string[]?args)??

????????{??

??

????????????IUsers?studentChangeBll?=?SpringHelper.GetObject<IUsers>("Users");??

??

????????????Console.WriteLine(studentChangeBll.GetUserInfo());??

????????????Console.Read();??

????????}??

????}??

}</span>??

在控制臺程序中創(chuàng)建一個配置文件：

[csharp]?view plaincopyprint?

<span?style="font-size:18px;"><?xml?version="1.0"?encoding="utf-8"??>??

<configuration>??

??<configSections>??

????<sectionGroup?name="spring">??

??????<section?name="context"??

???????????????type="Spring.Context.Support.ContextHandler,?Spring.Core"/>??

??????<section?name="objects"??

???????????????type="Spring.Context.Support.DefaultSectionHandler,?Spring.Core"?/>??

????</sectionGroup>??

??</configSections>??

??<spring>??

????<context>??

??????<resource?uri="config://spring/objects"/>??

????</context>??

????<objects?xmlns="http://www.springframework.net">??

??????<!--這的配置根據(jù)實際的程序來的，UsersCompontents是程序集Spring.Demo.Compontext下的一個類-->??

??????<object?name="Users"??

??????????????type="Spring.Demo.Compontext.UsersCompontents,Spring.Demo.Compontext"??singleton="false"?>??

??????</object>??

????</objects>??

??</spring>??

</configuration></span>??

運行后，發(fā)現(xiàn)SpringHelper卻小引用。我們一般寫代碼中我們是這樣寫的：

[csharp]?view plaincopyprint?

<span?style="font-size:18px;">//從config文件中取得程序集信息??

IApplicationContext?context?=?ConfigurationManager.GetSection("spring/context")??

???????????????????????????????as?IApplicationContext;??

//調(diào)用方法??

//Users為config文件里的配置節(jié)??

//<object?name="Users"?????????

//????????type="Spring.Demo.Compontext.UsersCompontents,Spring.Demo.Compontent">??

//</object>??

IUsers?user?=?context.GetObject("Users")?as?IUsers;</span>??

這樣我們就可以從配置文件中將對象取出來，但是我們都不想在代碼中有多余的代碼，不能每一次new對象的時候，我們都要寫一遍這句話：IApplicationContext context = ConfigurationManager.GetSection("spring/context") as IApplicationContext;這樣就增加了我們維護代碼的成本，因此，我們將這句話封裝起來，封裝的代碼是這樣的：

創(chuàng)建一個類：SpringHelper：

[csharp]?view plaincopyprint?

<span?style="font-size:18px;">using?System;??

using?System.Collections.Generic;??

using?System.Linq;??

using?System.Text;??

using?Spring.Context;??

using?Spring.Context.Support;??

??

namespace?ITOO.Library.Core.AOP??

{??

????public?class?SpringHelper??

????{??

????????///?<summary>??

????????///?Spring容器上下文??

????????///?</summary>??

????????private?static?IApplicationContext?SpringContext??

????????{??

????????????get??

????????????{??

????????????????return?ContextRegistry.GetContext();??

????????????}??

????????}??

??

??

????????///?<summary>??

????????///?獲取配置文件?配置的?對象??

????????///?</summary>??

????????///?<typeparam?name="T"></typeparam>??

????????///?<param?name="objName"></param>??

????????///?<returns></returns>??

????????public?static?T?GetObject<T>(string?objName)?where?T?:?class??

????????{??

????????????return?(T)SpringContext.GetObject(objName);??

????????}??

????}??

}??

??

??

</span>??

以上的代碼我們就可以將每次讀取配置文件中的那句話去掉了，我們直接就可以寫這樣一句話就可以了：IUsers studentChangeBll = SpringHelper.GetObject<IUsers>("Users");

這里體現(xiàn)了封裝的重要性，先前我在做AOP的時候，我的師傅看到了類似這樣的代碼的時候，他就跟我討論過這個問題，我當(dāng)時懵懵懂懂，沒有進行下一步的行動，現(xiàn)在想想，問題出現(xiàn)在我根本沒有動手去做，或者知識沒有深入到那個層次，認識這個知識的方面沒有那么深。所有問題，都要動手去做才行。

總結(jié)：

我們從上面的實踐到分析之后，我們發(fā)現(xiàn)其實我們看似是新的東西，其實我們已經(jīng)學(xué)習(xí)過了，就像IOC容器一樣，我們學(xué)習(xí)過了反射和配置文件，我們發(fā)現(xiàn)其實IOC容器不就是反射和配置文件來實現(xiàn)的嗎，反射和配置文件是我們在大話設(shè)計模式中就已經(jīng)學(xué)習(xí)到了的東西，這都不是新的東西。一個看似復(fù)雜的東西，都是有簡單的東西來組裝成的，我們知道這個，就不會對新的東西有畏懼感了。

總結(jié)

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