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28.1.1 元数据
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C#高级编程（第3版）【全文连载】
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28.1.1 元数据
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165708.htm'>27.3.4 测试民意的投票控件</a></div><div style='float:right;width:49%'>·<a href='100165709.htm'>27.4 小结</a></div><div style='float:left;width:49%'>·<a href='100165710.htm'>28.1 .NET和COM</a></div><div style='float:right;width:49%'>·<a href='100165712.htm'>28.1.2 释放内存</a></div><div style='float:left;width:49%'>·<a href='100165713.htm'>28.1.3 接口</a></div><div style='float:right;width:49%'>·<a href='100165714.htm'>28.1.4 方法绑定</a></div></div>
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0cm'><span lang=EN-US>28.1.1 </span><span style='font-family:黑体'>元数据</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>在</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>中，组件的所有信息都存储在类型库中。类型库包含的信息有接口、方法和参数的名称和</span><span
lang=EN-US>ID</span><span style='font-family:宋体'>等。而在</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>中，所有这些信息都可以存储在程序集中，如第</span><span lang=EN-US>10</span><span
style='font-family:宋体'>章和第</span><span lang=EN-US>13</span><span
style='font-family:宋体'>章所述。使用</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>存在的问题是，类型库是不能扩展的。在</span><span lang=EN-US>C++ IDL(</span><span
style='font-family:宋体'>接口定义语言</span><span lang=EN-US>)</span><span
style='font-family:宋体'>中，文件用于描述接口和方法。其中一些</span><span lang=EN-US>IDL</span><span
style='font-family:宋体'>修饰符不在类型库中，因为</span><span lang=EN-US>Visual Basic(</span><span
style='font-family:宋体'>和负责开发类型库的</span><span lang=EN-US>Visual Basic</span><span
style='font-family:宋体'>小组</span><span lang=EN-US>)</span><span
style='font-family:宋体'>不能使用这些</span><span lang=EN-US>IDL</span><span
style='font-family:宋体'>修饰符。而在</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>中，不存在这个问题，因为</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>元数据可以使用定制特性来扩展。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>因此，一些</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>组件有类型库，而其他</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>组件没有。如果没有类型库可用，就可以使用</span><span lang=EN-US>C++</span><span
style='font-family:宋体'>头文件来描述接口和方法。在</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>中，使用带有类型库的</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>组件是比较容易的，但也可能使用不带类型库的</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>组件。在这种情况下，必须使用</span><span lang=EN-US>C#</span><span
style='font-family:宋体'>代码重新定义</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>接口。</span></p>
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<h1 id="divCurrentNode2" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165711.htm'><font color='red'>28.1.1 元数据</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165708.htm'>27.3.4 测试民意的投票控件</a></div><div style='float:right;width:49%'>·<a href='100165709.htm'>27.4 小结</a></div><div style='float:left;width:49%'>·<a href='100165710.htm'>28.1 .NET和COM</a></div><div style='float:right;width:49%'>·<a href='100165712.htm'>28.1.2 释放内存</a></div><div style='float:left;width:49%'>·<a href='100165713.htm'>28.1.3 接口</a></div><div style='float:right;width:49%'>·<a href='100165714.htm'>28.1.4 方法绑定</a></div></div>
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