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16.3.2 特性和属性
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16.3.2 特性和属性
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165461.htm'>16.2 .NET Remoting概述</a></div><div style='float:right;width:49%'>·<a href='100165462.htm'>16.3 环境</a></div><div style='float:left;width:49%'>·<a href='100165463.htm'>16.3.1 激活</a></div><div style='float:right;width:49%'>·<a href='100165465.htm'>16.3.3 环境之间的通信</a></div><div style='float:left;width:49%'>·<a href='100165466.htm'>16.4 远程对象、客户机和服务器</a></div><div style='float:right;width:49%'>·<a href='100165467.htm'>16.4.1 远程对象</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-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt"><a ftel="_Toc507815548"><span lang="EN-US">16.3.2 </span></a><span style="FONT-FAMILY: 黑体">特性和属性</span></h3>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">有了环境特性，就可以定义环境的属性。环境特性类从根本上来说是特性。第</span><span lang="EN-US">10</span><span style="FONT-FAMILY: 宋体">章有特性的详细介绍。环境特性类必须执行接口</span><span lang="EN-US">IContext Attribute</span><span style="FONT-FAMILY: 宋体">。因为</span><span lang="EN-US">ContextAttribute</span><span style="FONT-FAMILY: 宋体">类总是有</span><span lang="EN-US">IContextAttribute</span><span style="FONT-FAMILY: 宋体">接口的一个默认实现方式，所以定制的环境特性类可以由</span><span lang="EN-US">ContextAttribute</span><span style="FONT-FAMILY: 宋体">类派生而来。</span></p>
<p class="MsoNormal"><span lang="EN-US" style="LETTER-SPACING: -0.2pt">.NET Framework 1.1</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.2pt">有一个环境特性类：即</span><span lang="EN-US" style="LETTER-SPACING: -0.2pt">System.Runtime.Remoting.Contexts. Synchronization</span><span lang="EN-US"> Attribute</span><span style="FONT-FAMILY: 宋体">。</span><span lang="EN-US" style="COLOR: black">Synchronization</span><span style="COLOR: black; FONT-FAMILY: 宋体">特性用于定义同步的要求，它指定对象需要的同步特性。可以指定多个线程不能同时访问对象，但是访问对象的线程可以改变。</span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-FAMILY: 宋体">使用这个特性的构造函数，可以设置以下</span><span lang="EN-US" style="COLOR: black">4</span><span style="COLOR: black; FONT-FAMILY: 宋体">个值：</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span lang="EN-US">NOT_SUPPORTED</span><span style="FONT-FAMILY: 宋体">，定义不应该在设置了同步的环境中对类进行实例化。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span lang="EN-US">REQUIRED</span><span style="FONT-FAMILY: 宋体">，指定需要有同步环境。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US" style="COLOR: black">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span style="COLOR: black; FONT-FAMILY: 宋体">使用</span><span lang="EN-US" style="COLOR: black">REQUIRED_NEW</span><span style="COLOR: black; FONT-FAMILY: 宋体">，总是得到一个新的环境。</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; FTEL: -16.1pt"><span lang="EN-US">●<span style="FONT: 7pt 'Times New Roman'"> </span></span><span lang="EN-US">SUPPORTED</span><span style="FONT-FAMILY: 宋体">，表示得到什么样的环境并不重要，只要环境中有对象即可。</span></p></div>
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