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16.5.2 格式标识符
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16.5.2 格式标识符
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165469.htm'>16.4.3 简单的客户机</a></div><div style='float:right;width:49%'>·<a href='100165470.htm'>16.5 .NET Remoting体系结构</a></div><div style='float:left;width:49%'>·<a href='100165471.htm'>16.5.1 信道</a></div><div style='float:right;width:49%'>·<a href='100165473.htm'>16.5.3 ChannelServices和RemotingConfiguration</a></div><div style='float:left;width:49%'>·<a href='100165474.htm'>16.5.4 对象的激活</a></div><div style='float:right;width:49%'>·<a href='100165475.htm'>16.5.5 消息接收器</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="_Toc507815556"><span lang="EN-US">16.5.2 </span></a><span style="FONT-FAMILY: 黑体">格式标识符</span></h3>
<p class="MsoNormal"><span lang="EN-US" style="COLOR: black">.NET Framework</span><span style="COLOR: black; FONT-FAMILY: 宋体">提供了两个格式标识符类，即：</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">System.Runtime.Serialization.Formatters.Binary.BinaryFormatter</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">System.Runtime.Serialization.Formatters.Soap.SoapFormatter </span></p>
<p class="MsoBodyTextIndent2" style="LINE-HEIGHT: 17pt"><span style="FONT-FAMILY: 宋体">通过格式标识符接收器对象和格式标识符接收器提供程序，可以把格式标识符和信道联系起来。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17pt"><span style="FONT-FAMILY: 宋体">这两个格式标识符类都实现接口</span><span lang="EN-US">System.Runtime.Remoting.Messaging.IRemotingFormatter</span><span style="FONT-FAMILY: 宋体">，<span style="LETTER-SPACING: -0.1pt">该接口定义</span></span><span lang="EN-US" style="LETTER-SPACING: -0.1pt">Serialize()</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.1pt">方法和</span><span lang="EN-US" style="LETTER-SPACING: -0.1pt"> Deserialize()</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.1pt">方法，以便把数据传输到信道中和从信道中获取数</span><span style="FONT-FAMILY: 宋体">据。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17pt"><span style="COLOR: black; FONT-FAMILY: 宋体">格式标识符也是“可插入的”。在编写定制的格式标识符类时，必须把实例与要使用的信道联系起来，这项工作使用格式标识符接收器和格式标识符接收器提供程序就可以完成。例如，在创建前面介绍的信道时，格式标识符接收器提供程序</span><span lang="EN-US" style="COLOR: black; LETTER-SPACING: -0.2pt">SoapServerFormatterSinkProvider</span><span style="COLOR: black; FONT-FAMILY: 宋体; LETTER-SPACING: -0.2pt">可以作为参数来传递。格式标识符接收器提供程序为服务器实现接口</span><span lang="EN-US" style="COLOR: black">IServerChannelSinkProvider</span><span style="COLOR: black; FONT-FAMILY: 宋体">，为客户机实现接口</span><span lang="EN-US" style="COLOR: black">IClientChannelSinkProvider</span><span style="COLOR: black; FONT-FAMILY: 宋体">。这两个接口都定义了方法</span><span lang="EN-US" style="COLOR: black">CreateSink()</span><span style="COLOR: black; FONT-FAMILY: 宋体">，这个方法必须返回格式标识符接收器。</span><span lang="EN-US" style="COLOR: black; LETTER-SPACING: -0.1pt">SoapServerFormatterSinkProvider</span><span style="COLOR: black; FONT-FAMILY: 宋体; LETTER-SPACING: -0.1pt">返回类</span><span lang="EN-US" style="COLOR: black">SoapServerFormatterSink</span><span style="COLOR: black; FONT-FAMILY: 宋体">的实例。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17pt"><span style="COLOR: black; FONT-FAMILY: 宋体">在客户端，类</span><span lang="EN-US" style="COLOR: black">So<span style="LETTER-SPACING: -0.2pt">apClientFormatterSink</span></span><span style="COLOR: black; FONT-FAMILY: 宋体; LETTER-SPACING: -0.2pt">使用</span><span lang="EN-US" style="COLOR: black">So<span style="LETTER-SPACING: -0.2pt">apFormatter</span></span><span style="COLOR: black; FONT-FAMILY: 宋体; LETTER-SPACING: -0.2pt">类的</span><span lang="EN-US" style="COLOR: black; LETTER-SPACING: -0.2pt">SyncProcessMessage()</span><span style="COLOR: black; FONT-FAMILY: 宋体; LETTER-SPACING: -0.2pt">方法</span><span style="COLOR: black"> </span><span style="COLOR: black; FONT-FAMILY: 宋体">和</span><span lang="EN-US" style="COLOR: black">AsyncProcess Message()</span><span style="COLOR: black; FONT-FAMILY: 宋体">方法，把消息串行化。而</span><span lang="EN-US" style="COLOR: black">SoapServerFormatterSink</span><span style="COLOR: black; FONT-FAMILY: 宋体">使用</span><span lang="EN-US" style="COLOR: black">SoapFormatter </span><span style="COLOR: black; FONT-FAMILY: 宋体">把消息并行化。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17pt"><span style="COLOR: black; FONT-FAMILY: 宋体">所有这些接收器和提供程序类都可以扩展，都可以被定制的实现替代。</span></p></div>
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