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29.2.1 类ServicedComponent
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29.2.1 类ServicedComponent
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165747.htm'>29.1.8 排队的组件</a></div><div style='float:right;width:49%'>·<a href='100165748.htm'>29.1.9 松散藕合的事件</a></div><div style='float:left;width:49%'>·<a href='100165749.htm'>29.2 创建简单的COM+应用程序</a></div><div style='float:right;width:49%'>·<a href='100165751.htm'>29.2.2 应用程序属性</a></div><div style='float:left;width:49%'>·<a href='100165752.htm'>29.2.3 创建组件</a></div><div style='float:right;width:49%'>·<a href='100165753.htm'>29.3 部署</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>29.2.1 </span><span style='font-family:黑体'>类</span><span
lang=EN-US>ServicedComponent</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>每个服务组件类都必须派生于基类</span><span
lang=EN-US>ServicedComponent</span><span style='font-family:宋体'>。</span><span
lang=EN-US>ServicedComponent</span><span style='font-family:宋体'>类本身派生于类</span><span
lang=EN-US>ContextBoundObject</span><span style='font-family:宋体'>，所以实例会绑定到</span><span
lang=EN-US>.NET Remoting</span><span style='font-family:宋体'>环境上。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>类</span><span lang=EN-US>ServicedComponent</span><span
style='font-family:宋体'>包含一些可重写的受保护方法。</span></p>
<p class=a5 style='margin-top:8.15pt'><span style='font-family:黑体'>表</span><span
lang=EN-US> 19-1</span></p>
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<p class=a5 style='margin-top:0cm'><span style='font-family:黑体'>受保护的方法</span></p>
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<p class=a5 style='margin-top:0cm'><span style='font-family:黑体'>说</span><span
lang=EN-US> </span><span style='font-family:黑体'>明</span></p>
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<p class=a4 style='margin-left:10.7pt'><span lang=EN-US>Activate()</span></p>
<p class=a4 style='margin-left:10.7pt'><span lang=EN-US>Deactivate()</span></p>
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solid windowtext 1.0pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a4 style='margin-left:10.7pt'><span style='font-family:宋体'>如果对象配置为使用对象池，就调用</span><span
lang=EN-US>Activate()</span><span style='font-family:宋体'>和</span><span
lang=EN-US>Deactivate()</span><span style='font-family:宋体'>方法。从对象池中取出对象时，就调用</span><span
lang=EN-US>Activate()</span><span style='font-family:宋体'>方法。在对象放回对象池之前，调用</span><span
lang=EN-US>Deactivate()</span><span style='font-family:宋体'>方法。</span></p>
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<p class=a4 style='margin-left:10.7pt'><span lang=EN-US>CanBePooled()</span></p>
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<p class=a4 style='margin-left:10.7pt'><span style='font-family:宋体'>这是对象池的另一个方法。如果对象的状态不一致，就可以在</span><span
lang=EN-US>CanBePooled()</span><span style='font-family:宋体'>的重写实现中返回</span><span
lang=EN-US>false</span><span style='font-family:宋体'>。这样对象就不会放回对象池，而是被销毁。而对象池会创建一个新对象</span></p>
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none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
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<p class=a4 style='margin-left:10.7pt'><span lang=EN-US>Construct()</span></p>
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solid windowtext 1.0pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a4 style='margin-left:10.7pt'><span style='font-family:宋体'>这个方法在实例化时调用，实例化时将一个构造字符串传送给对象。构造字符串可以由系统管理员修改。本章后面将使用构造字符串定义数据库连接字符串</span></p>
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<div style='float:left;width:49%'>·<a href='100165747.htm'>29.1.8 排队的组件</a></div><div style='float:right;width:49%'>·<a href='100165748.htm'>29.1.9 松散藕合的事件</a></div><div style='float:left;width:49%'>·<a href='100165749.htm'>29.2 创建简单的COM+应用程序</a></div><div style='float:right;width:49%'>·<a href='100165751.htm'>29.2.2 应用程序属性</a></div><div style='float:left;width:49%'>·<a href='100165752.htm'>29.2.3 创建组件</a></div><div style='float:right;width:49%'>·<a href='100165753.htm'>29.3 部署</a></div></div>
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