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28.1.2 释放内存
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C#高级编程（第3版）【全文连载】
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28.1.2 释放内存
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165709.htm'>27.4 小结</a></div><div style='float:right;width:49%'>·<a href='100165710.htm'>28.1 .NET和COM</a></div><div style='float:left;width:49%'>·<a href='100165711.htm'>28.1.1 元数据</a></div><div style='float:right;width:49%'>·<a href='100165713.htm'>28.1.3 接口</a></div><div style='float:left;width:49%'>·<a href='100165714.htm'>28.1.4 方法绑定</a></div><div style='float:right;width:49%'>·<a href='100165715.htm'>28.1.5 数据类型</a></div></div>
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0cm'><span lang=EN-US>28.1.2 </span><span style='font-family:黑体'>释放内存</span></h3>
<p class=MsoNormal><span style='font-family:宋体;letter-spacing:.1pt'>在</span><span
lang=EN-US style='letter-spacing:.1pt'>.NET</span><span style='font-family:
宋体;letter-spacing:.1pt'>中，内存的释放是由垃圾收集器完成的。这完全不同于</span><span lang=EN-US
style='letter-spacing:.1pt'>COM</span><span style='font-family:宋体;letter-spacing:
.1pt'>，</span><span lang=EN-US style='letter-spacing:.1pt'>COM</span><span
style='font-family:宋体;letter-spacing:.1pt'>依赖的是引用数。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>接口</span><span lang=EN-US>IUnknown</span><span
style='font-family:宋体'>是每个</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>对象必须实现的一个接口，它提供了</span><span lang=EN-US>3</span><span
style='font-family:宋体'>个方法。其中两个方法与引用数有关。如果需要另一个接口指针，客户就必须调用方法</span><span
lang=EN-US>AddRef()</span><span style='font-family:宋体'>，这个方法会递增引用数。方法</span><span
lang=EN-US>Release()</span><span style='font-family:宋体'>会递减引用数，如果所得的引用数是</span><span
lang=EN-US>0</span><span style='font-family:宋体'>，就销毁对象，释放内存。</span></p>
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<div style='float:left;width:49%'>·<a href='100165709.htm'>27.4 小结</a></div><div style='float:right;width:49%'>·<a href='100165710.htm'>28.1 .NET和COM</a></div><div style='float:left;width:49%'>·<a href='100165711.htm'>28.1.1 元数据</a></div><div style='float:right;width:49%'>·<a href='100165713.htm'>28.1.3 接口</a></div><div style='float:left;width:49%'>·<a href='100165714.htm'>28.1.4 方法绑定</a></div><div style='float:right;width:49%'>·<a href='100165715.htm'>28.1.5 数据类型</a></div></div>
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