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28.3.3 线程问题
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C#高级编程（第3版）【全文连载】
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28.3.3 线程问题
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2006-10-13 14:41:00
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<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 style='float:left;width:49%'>·<a href='100165723.htm'>28.3.2 创建Runtime Callable Wrapper</a></div><div style='float:right;width:49%'>·<a href='100165725.htm'>28.3.4 添加连接点</a></div><div style='float:left;width:49%'>·<a href='100165726.htm'>28.3.5 在Windows窗体中使用ActiveX控件</a></div><div style='float:right;width:49%'>·<a href='100165727.htm'>28.3.6 在ASP.NET中使用COM对象</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>28.3.3 </span><span style='font-family:黑体'>线程问题</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>如本章前面所述，</span><span
lang=EN-US>COM</span><span style='font-family:宋体'>组件根据执行的线程安全与否，标记它要包含的单元</span><span
lang=EN-US>(STA</span><span style='font-family:宋体'>或</span><span lang=EN-US>MTA)</span><span
style='font-family:宋体'>。但是，线程必须加入到单元中。在每个</span><span lang=EN-US>Windows</span><span
style='font-family:宋体'>或控制台应用程序中，</span><span lang=EN-US>Visual Studio .NET</span><span
style='font-family:宋体'>都会把特性</span><span lang=EN-US>[STAThread]</span><span
style='font-family:宋体'>应用于方法</span><span lang=EN-US>Main()</span><span
style='font-family:宋体'>。这个特性表示线程加入</span><span lang=EN-US>STA</span><span
style='font-family:宋体'>。与之相反的是特性</span><span lang=EN-US>[MTAThread]</span><span
style='font-family:宋体'>，它表示线程加入</span><span lang=EN-US>MTA</span><span
style='font-family:宋体'>。如果没有应用特性，默认情况下就加入</span><span lang=EN-US>MTA</span><span
style='font-family:宋体'>。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>还可以使用</span><span lang=EN-US>Thread</span><span
style='font-family:宋体'>类的</span><span lang=EN-US>ApartmentState</span><span
style='font-family:宋体'>特性编程设置单元状态。</span><span lang=EN-US>ApartmentState</span><span
style='font-family:宋体'>特性允许设置</span><span lang=EN-US>ApartmentState</span><span
style='font-family:宋体'>枚举中的一个值。</span><span lang=EN-US>ApartmentState</span><span
style='font-family:宋体'>枚举的值有</span><span lang=EN-US>STA</span><span
style='font-family:宋体'>和</span><span lang=EN-US>MTA(</span><span
style='font-family:宋体'>如果没有设置，就使用</span><span lang=EN-US>Unknown)</span><span
style='font-family:宋体'>。注意线程的单元状态只能设置一次。如果第二次设置它，就会忽略第二次的设置。</span></p>
<p class=a2 style='margin-top:8.15pt;FTEL:21.45pt'><span
style='font-family:黑体'>提示：</span></p>
<p align=center style='FTEL:8.15pt;FTEL:21.45pt'><span
style='font-family:楷体_GB2312'>如果线程选择了组件所不支持的单元，该怎么办？</span><span lang=EN-US>COM</span><span
style='font-family:楷体_GB2312'>运行库会自动创建</span><span lang=EN-US>COM</span><span
style='font-family:楷体_GB2312'>组件的正确单元。但是，如果在调用组件的方法时跨越了单元边界，性能就会降低。</span></p>
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<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 style='float:left;width:49%'>·<a href='100165723.htm'>28.3.2 创建Runtime Callable Wrapper</a></div><div style='float:right;width:49%'>·<a href='100165725.htm'>28.3.4 添加连接点</a></div><div style='float:left;width:49%'>·<a href='100165726.htm'>28.3.5 在Windows窗体中使用ActiveX控件</a></div><div style='float:right;width:49%'>·<a href='100165727.htm'>28.3.6 在ASP.NET中使用COM对象</a></div></div>
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