谈到高级语言编程,我们就会联想到设计模式;谈到设计模式,我们就会说道怎么样解耦合。而Spring.NET的IoC容器其中的一种用途就是解耦合,其最经典的应用就是:依赖注入(Dependeny Injection)简称DI,目前DI是最优秀的解耦方式之一。下面我就来谈谈依赖注入的应用场景。
我模拟了三种不同的场景,可以一起学习使用依赖注入的重要性。
下面是应用场景的条件:人类使用工具劳动。
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场景一,原始社会:原始人使用长矛打猎
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从上面代码我们不难看出,虽然使用的经典的里氏替换原则,但PrimitivePerson类于Spear类存在着耦合。
场景二,经济社会:使用工具耕作
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从上面代码我可以看出:运用的经典的工厂模式, EconomyPerson仅仅对工厂耦合,并不关心工厂是怎样制造工具。
场景三,现在社会:使用工具办公
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<?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">
<description>一个简单的控制反转例子</description>
<object id="computer" type="SpringNetIoC.Computer, SpringNetIoC" />
<object id="modernPerson" type="SpringNetIoC.ModernPerson, SpringNetIoC">
<property name="Tool" ref="computer"/>
</object>
</objects>
</spring>
</configuration>
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从上面代码我们可以看出,把对象交给Spring.NET容器进行管理,ModernPerson类不需要知道具体使用什么工具,仅仅是机械化的工作。至于使用的什么工具,则由配置文件决定,所有对象由Spring.NET容器管理,这样可以实现动态的拆装组建和组件重用。我个人理解依赖注入是反射工厂的加强版。
^-^