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28.1 .NET和COM
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C#高级编程（第3版）【全文连载】
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28.1 .NET和COM
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165707.htm'>27.3.3 测试民意的投票类型</a></div><div style='float:right;width:49%'>·<a href='100165708.htm'>27.3.4 测试民意的投票控件</a></div><div style='float:left;width:49%'>·<a href='100165709.htm'>27.4 小结</a></div><div style='float:right;width:49%'>·<a href='100165711.htm'>28.1.1 元数据</a></div><div style='float:left;width:49%'>·<a href='100165712.htm'>28.1.2 释放内存</a></div><div style='float:right;width:49%'>·<a href='100165713.htm'>28.1.3 接口</a></div></div>
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<p class=MsoNormal><span style='font-family:宋体'>如果您在学习</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>之前编写过</span><span lang=EN-US>Windows</span><span
style='font-family:宋体'>程序，通常就没有时间和资源用</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>重新编写以前的程序。已有的功能代码不必重写，因为可以使用一种新技术。我们本来有数千行可运行的代码，重写它们需要的精力太多，还不如把它们迁移到托管的环境中。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>这也同样适用于</span><span lang=EN-US>Microsoft</span><span
style='font-family:宋体'>。在命名空间</span><span lang=EN-US>System.DirectoryService</span><span
style='font-family:宋体'>中，</span><span lang=EN-US>Microsoft</span><span
style='font-family:宋体'>并没有重新编写</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>对象来访问有层次的数据存储，这个命名空间中的类实际上是访问</span><span lang=EN-US>ADSI
COM</span><span style='font-family:宋体'>对象的包装器。</span><span lang=EN-US>System.Data.OleDb</span><span
style='font-family:宋体'>命名空间也是这样，由这个命名空间中的类所使用的</span><span lang=EN-US>OLE DB</span><span
style='font-family:宋体'>提供程序包含相当复杂的</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>接口。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>我们自己的解决方案也会面临相同的问题。如果在</span><span
lang=EN-US>.NET</span><span style='font-family:宋体'>应用程序中要使用已有的</span><span
lang=EN-US>COM</span><span style='font-family:宋体'>对象，或者要编写在旧</span><span
lang=EN-US>COM</span><span style='font-family:宋体'>客户中使用的</span><span
lang=EN-US>.NET</span><span style='font-family:宋体'>组件，就应使用本章介绍的</span><span
lang=EN-US>COM</span><span style='font-family:宋体'>互操作性。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>本章的主要内容如下：</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>比较</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>和</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>技术</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>在</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>应用程序中使用</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>对象</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>在</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>客户中使用</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>组件</span></p>
<p class=MsoNormal><span style='font-family:宋体'>与其他章节一样，本章的示例代码也可以从</span><span
lang=EN-US>Wrox</span><span style='font-family:宋体'>网站</span><span lang=EN-US>www.wrox.com</span><span
style='font-family:宋体'>上下载。</span></p>
<h3 style='margin-top:11.4pt;margin-right:0cm;FTEL:11.4pt;margin-left:
0cm'><span lang=EN-US>28.1 .NET</span><span style='font-family:楷体_GB2312'>和</span><span
lang=EN-US>COM</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>使用</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>和</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>交互操作的主要问题是要理解</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>。为</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>客户提供</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>组件或联合使用</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>对象和</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>时，</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>时代的全部问题又回来了。所以这里首先比较</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>和</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>如果您已经熟练掌握了</span><span
lang=EN-US>COM</span><span style='font-family:宋体'>技术，本节将是</span><span
lang=EN-US>COM</span><span style='font-family:宋体'>知识的复习。否则，您将学习到</span><span
lang=EN-US>COM</span><span style='font-family:宋体'>的概念<span style='letter-spacing:
-1.0pt'>——</span></span><span style='letter-spacing:-1.0pt'> </span><span
style='font-family:宋体'>现在是使用</span><span lang=EN-US>.NET</span><span
style='font-family:宋体;letter-spacing:-1.0pt'>——</span><span style='letter-spacing:
-1.0pt'> </span><span style='font-family:宋体'>我们不再需要在日常事务中处理它了。但是，在把</span><span
lang=EN-US>COM</span><span style='font-family:宋体'>技术集成到</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>应用程序中时，</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>的问题仍旧存在。</span></p>
<p class=MsoNormal><span lang=EN-US>COM</span><span style='font-family:宋体'>和</span><span
lang=EN-US>.NET</span><span style='font-family:宋体'>有许多类似的概念和不同的解决方案。下面将讨论：</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>元数据</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>释放内存</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>接口</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>方法绑定</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>数据类型</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>注册</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>线程</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>错误处理</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>事件处理</span></p>
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<div style='float:left;width:49%'>·<a href='100165707.htm'>27.3.3 测试民意的投票类型</a></div><div style='float:right;width:49%'>·<a href='100165708.htm'>27.3.4 测试民意的投票控件</a></div><div style='float:left;width:49%'>·<a href='100165709.htm'>27.4 小结</a></div><div style='float:right;width:49%'>·<a href='100165711.htm'>28.1.1 元数据</a></div><div style='float:left;width:49%'>·<a href='100165712.htm'>28.1.2 释放内存</a></div><div style='float:right;width:49%'>·<a href='100165713.htm'>28.1.3 接口</a></div></div>
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