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        29.1.1  Enterprise Services简史
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                        C#高级编程（第3版）【全文连载】
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                        29.1.1  Enterprise Services简史
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                    2006-10-13 14:41:00
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                <div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;margin-left:
0cm'><span lang=EN-US>29.1.1&nbsp; Enterprise Services</span><span
style='font-family:黑体'>简史</span></h3>

<p class=MsoNormal><span lang=EN-US>Enterprise Services</span><span
style='font-family:宋体'>可以追溯到发布为一个</span><span lang=EN-US>Windows NT 4.0</span><span
style='font-family:宋体'>选项包的</span><span lang=EN-US>Microsoft Transaction
Server(MTS)</span><span style='font-family:宋体'>。</span><span lang=EN-US>MTS</span><span
style='font-family:宋体'>提供了</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>对象的事务处理等服务，扩展了</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>。由于</span><span lang=EN-US>MTS</span><span
style='font-family:宋体'>扩展</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>的方式与</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>不兼容，所以从</span><span lang=EN-US>MTS</span><span
style='font-family:宋体'>应用程序中调用</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>对象需要特定</span><span lang=EN-US>MTS API</span><span
style='font-family:宋体'>调用。</span></p>

<p class=MsoNormal><span lang=EN-US>Windows 2000</span><span style='font-family:
宋体'>的一个最重要的新特性是在</span><span lang=EN-US>COM+</span><span style='font-family:
宋体'>中集成了</span><span lang=EN-US>MTS</span><span style='font-family:宋体'>和</span><span
lang=EN-US>COM</span><span style='font-family:宋体'>。在</span><span lang=EN-US>Windows
2000</span><span style='font-family:宋体'>中，</span><span lang=EN-US>COM+</span><span
style='font-family:宋体'>基本服务支持</span><span lang=EN-US>COM+</span><span
style='font-family:宋体'>服务</span><span lang=EN-US>(</span><span
style='font-family:宋体'>以前的</span><span lang=EN-US>MTS</span><span
style='font-family:宋体'>服务</span><span lang=EN-US>)</span><span
style='font-family:宋体'>需要的环境，例如分布式事务处理。</span><span lang=EN-US>COM+</span><span
style='font-family:宋体'>也新增了一些服务。</span></p>

<p class=MsoNormal><span lang=EN-US>COM+ 1.5</span><span style='font-family:
宋体'>可以在</span><span lang=EN-US>Windows XP</span><span style='font-family:宋体'>和</span><span
lang=EN-US>Windows Server 2003</span><span style='font-family:宋体'>中使用。</span><span
lang=EN-US>COM+ 1.5</span><span style='font-family:宋体'>也新增了一些特性，以提高可伸缩性和可用性，包括应用程序池和循环，以及可配置的隔离级别。</span></p>

<p class=MsoNormal><span lang=EN-US>.NET Enterprise Services</span><span
style='font-family:宋体'>可以在</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>组件中使用</span><span lang=EN-US>COM+</span><span
style='font-family:宋体'>服务，并为</span><span lang=EN-US>Windows 2000</span><span
style='font-family:宋体'>及其后续版本提供了支持。在</span><span lang=EN-US>COM+</span><span
style='font-family:宋体'>应用程序中运行</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>组件，不需要使用</span><span lang=EN-US>CCW(</span><span
style='font-family:宋体'>参阅第</span><span lang=EN-US>28</span><span
style='font-family:宋体'>章</span><span lang=EN-US>)</span><span style='font-family:
宋体'>；而是作为</span><span lang=EN-US>.NET</span><span style='font-family:宋体'>组件运行。在操作系统上安装</span><span
lang=EN-US>.NET</span><span style='font-family:宋体'>运行库程序，会给</span><span
lang=EN-US>COM+</span><span style='font-family:宋体'>服务添加一些扩展。如果安装了两个带有</span><span
lang=EN-US>Enterprise Services</span><span style='font-family:宋体'>的</span><span
lang=EN-US>.NET</span><span style='font-family:宋体'>组件，且组件</span><span
lang=EN-US>A</span><span style='font-family:宋体'>使用组件</span><span lang=EN-US>B</span><span
style='font-family:宋体'>，则不使用</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>编组功能，否则</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>组件可以直接彼此调用。</span></p>

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