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29.5 客户应用程序
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29.5 客户应用程序
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165754.htm'>29.3.1 自动部署</a></div><div style='float:right;width:49%'>·<a href='100165755.htm'>29.3.2 手工部署</a></div><div style='float:left;width:49%'>·<a href='100165756.htm'>29.4 组件服务管理工具</a></div><div style='float:right;width:49%'>·<a href='100165758.htm'>29.6 事务处理</a></div><div style='float:left;width:49%'>·<a href='100165759.htm'>29.6.1 ACID属性</a></div><div style='float:right;width:49%'>·<a href='100165760.htm'>29.6.2 事务处理的属性</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style='margin-top:11.4pt;margin-right:0cm;FTEL:11.4pt;margin-left:
0cm'><span lang=EN-US>29.5 </span><span style='font-family:楷体_GB2312'>客户应用程序</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>在建立了服务组件库后，就可以创建客户应用程序，这可以是简单的</span><span
lang=EN-US>C#</span><span style='font-family:宋体'>控制台应用程序。在为客户创建了项目后，必须引用服务组件中的程序集</span><span
lang=EN-US>SimpleServer</span><span style='font-family:宋体'>和程序集</span><span
lang=EN-US>System.EnterpriseServices</span><span style='font-family:宋体'>。接着编写代码，实例化一个新的</span><span
lang=EN-US>SimpleComponent</span><span style='font-family:宋体'>实例，调用方法</span><span
lang=EN-US>Welcome()</span><span style='font-family:宋体'>。在下面的代码中调用方法</span><span
lang=EN-US>Welcome()</span><span style='font-family:宋体'>共</span><span
lang=EN-US>10</span><span style='font-family:宋体'>次。在垃圾收集器采取措施前，</span><span
lang=EN-US>using</span><span style='font-family:宋体'>语句帮助释放分配给实例的资源。有了</span><span
lang=EN-US>using</span><span style='font-family:宋体'>语句，服务组件的</span><span
lang=EN-US>Dispose()</span><span style='font-family:宋体'>方法就会在</span><span
lang=EN-US>using</span><span style='font-family:宋体'>语句的最后调用。</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>using
System;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US> </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>namespace
Wrox.ProCSharp. EnterpriseServices</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
class Class1</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
static void Main(string[] args)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
using (SimpleComponent obj = new SimpleComponent())</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
for ( int i =0; i < 10; i++)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Console.WriteLine(obj.Welcome("Sharon"));</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>}</span></p>
<p class=MsoNormal><span style='font-family:宋体'>如果在配置服务器之前启动客户应用程序，服务器就会自动配置。服务器的自动配置是通过属性指定的值来进行的。下面进行测试。注销服务组件，再次启动客户程序。如果服务组件在客户应用程序的启动过程中配置，启动时间就会较长。这个特性只能用在开发阶段。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>在运行应用程序时，可以用组件服务管理工具监视服务组件。在树图中选择</span><span
lang=EN-US>Components</span><span style='font-family:宋体'>，再选择</span><span
lang=EN-US>View | Detail</span><span style='font-family:宋体'>，就可以查看设置属性</span><span
lang=EN-US>[EventTrackingEnabled]</span><span style='font-family:宋体'>后实例化对象的个数。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>可以看出，创建服务组件就是从基类</span><span
lang=EN-US>ServicedComponent</span><span style='font-family:宋体'>中派生一个类，再设置一些属性，来配置应用程序。下面要学习如何联合使用事务处理和服务组件。</span></p>
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