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28.1.9 事件处理
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C#高级编程（第3版）【全文连载】
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28.1.9 事件处理
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2006-10-13 14:41:00
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<h1 id="divCurrentNode" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165719.htm'><font color='red'>28.1.9 事件处理</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165716.htm'>28.1.6 注册</a></div><div style='float:right;width:49%'>·<a href='100165717.htm'>28.1.7 线程</a></div><div style='float:left;width:49%'>·<a href='100165718.htm'>28.1.8 错误处理</a></div><div style='float:right;width:49%'>·<a href='100165720.htm'>28.2 编组</a></div><div style='float:left;width:49%'>·<a href='100165721.htm'>28.3 在.NET客户程序中使用COM组件</a></div><div style='float:right;width:49%'>·<a href='100165722.htm'>28.3.1 创建COM组件</a></div></div>
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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>28.1.9 </span><span style='font-family:黑体'>事件处理</span></h3>
<p class=MsoNormal><span lang=EN-US>.NET</span><span style='font-family:宋体'>用</span><span
lang=EN-US>C#</span><span style='font-family:宋体'>关键字</span><span lang=EN-US>event</span><span
style='font-family:宋体'>和</span><span lang=EN-US>delegate</span><span
style='font-family:宋体'>提供了事件处理机制</span><span lang=EN-US>(</span><span
style='font-family:宋体'>参阅第</span><span lang=EN-US>6</span><span
style='font-family:宋体'>章</span><span lang=EN-US>)</span><span style='font-family:
宋体'>。第</span><span lang=EN-US>16</span><span style='font-family:宋体'>章讨论了可用于</span><span
lang=EN-US>.NET Remoting</span><span style='font-family:宋体'>的事件处理机制。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>图</span><span lang=EN-US>28-6</span><span
style='font-family:宋体'>显示了</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>的事件处理结构。在</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>事件中，组件必须实现接口</span><span lang=EN-US>IConnectionPointContainer</span><span
style='font-family:宋体'>和另一个实现接口</span><span lang=EN-US>IConnectionPoint</span><span
style='font-family:宋体'>的连接点对象</span><span lang=EN-US>(CPO)</span><span
style='font-family:宋体'>。在图</span><span lang=EN-US>28-6</span><span
style='font-family:宋体'>中，组件还定义了一个由</span><span lang=EN-US>CPO</span><span
style='font-family:宋体'>调用的输出接口</span><span lang=EN-US>ICompletesEvents</span><span
style='font-family:宋体'>。客户程序必须在</span><span lang=EN-US>sink</span><span
style='font-family:宋体'>对象中实现这个输出接口，而</span><span lang=EN-US>sink</span><span
style='font-family:宋体'>对象本身是一个</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>对象。在执行过程中，客户在服务器中查询方法</span><span lang=EN-US>FindConnectionPoint()</span><span
style='font-family:宋体'>，获得指向所返回的</span><span lang=EN-US>IConnectionPoint</span><span
style='font-family:宋体'>的指针。客户再使用这个接口指针调用</span><span lang=EN-US>Advise()</span><span
style='font-family:宋体'>方法，并把指向</span><span lang=EN-US>sink</span><span
style='font-family:宋体'>对象的指针传送给服务器。接着，组件就可以在客户的</span><span lang=EN-US>sink</span><span
style='font-family:宋体'>对象中调用方法了。</span></p>
<p class=a><span style='position:absolute;z-index:1;left:0px;margin-left:171px;
margin-top:33px;width:252px;height:28px'><img width=252 height=28
src="28/image006.gif"></span><span lang=EN-US><img width=302
height=186 src="28/image007.jpg"></span></p>
<p class=10><span style='font-family:宋体'>图</span><span lang=EN-US> 28-6</span></p>
<p class=MsoNormal><span style='font-family:宋体'>本章的后面将讨论</span><span
lang=EN-US>.NET</span><span style='font-family:宋体'>事件和</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>事件如何映射，让</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>客户处理</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>事件，</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>对象处理</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>事件。</span></p>
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<div style='float:left;width:49%'>·<a href='100165716.htm'>28.1.6 注册</a></div><div style='float:right;width:49%'>·<a href='100165717.htm'>28.1.7 线程</a></div><div style='float:left;width:49%'>·<a href='100165718.htm'>28.1.8 错误处理</a></div><div style='float:right;width:49%'>·<a href='100165720.htm'>28.2 编组</a></div><div style='float:left;width:49%'>·<a href='100165721.htm'>28.3 在.NET客户程序中使用COM组件</a></div><div style='float:right;width:49%'>·<a href='100165722.htm'>28.3.1 创建COM组件</a></div></div>
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