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以一种"廉价"的方式获取页面的标题(downmoon)

有朋友问到：“我需要得到一个webpage的title，因为这个title一般都比较靠前，只要取得html的前面少量内容就可以了。因为要取得很多个页面的title,如果下载整个htmlcode，肯定比较浪费时间。.net好像没有现成的类可以干这件事情(取得部分html)，我应该如何去实现？”一种比较"廉价"(即较小成本条件下)的解决思路：第一步：取出含有页面title部分的最小集合。这是“廉价”的关键！第二步：用正则表达式取出和</title</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:21:16</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2838</span></span>  </p> </article><article class="excerpt"> <header> <a title="编程技术" class="label label-important zj-del-target" href="/category/30">编程技术<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/13810" title="swfupload浅析" target="_blank" onclick="return recordId('',)">swfupload浅析 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13810" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/11.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/13810';}else{window.open('/article/13810');}" style="cursor: pointer;">一、简介和示例SWFUploadisasmallJavaScript/Flashlibrarytogetthebestofbothworlds.ItfeaturesthegreatuploadcapabilitiesofFlashandtheaccessibilityandeaseofHTML/CSS。官方站点：http://www.swfupload.org/简单来说，swfupload这个上传库是可以显示上传进度以及上传速度等上传信息。一般实现这种上传</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:08:20</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2838</span></span>  </p> </article><article class="excerpt"> <header> <a title="各行各业" class="label label-important zj-del-target" href="/category/38">各行各业<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/10344" title="Selenium - IDE模式匹配" target="_blank" onclick="return recordId('',)">Selenium - IDE模式匹配 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/10344" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/13.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/10344';}else{window.open('/article/10344');}" style="cursor: pointer;">Selenium-IDE模式匹配在SeleniumIDE中，如定位器，模式是selenium中经常使用的一种类型的参数。它允许用户描述特殊字符的模式。很多时候，我们想核实文字是动态的，在这种情况下，模式匹配是非常有用的。模式匹配是用于所有验证点命令-VerifyTextPresent，verifyTitle，verifyAlert，assertConfirmation，verifyText和verifyPrompt有三种方法来定义一个模式-通配符，正则表达</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:27:23</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2838</span></span>  </p> </article><article class="excerpt"> <header> <a title="Linux" class="label label-important zj-del-target" href="/category/53">Linux<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/1682" title="Linux学习笔记26——信号量" target="_blank" onclick="return recordId('',)">Linux学习笔记26——信号量 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/1682" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/18.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/1682';}else{window.open('/article/1682');}" style="cursor: pointer;">一信号量的基本概念信号量：它是一个特殊变量，只允许对它进行等待和发送信号这两种操作。假设有一个信号量变量svP(sv)：用于等待,如果sv的值大于零，就给它减去1，如果它的值等于零，就挂起该进程的执行。V(sv)：用于发送信号，如果有其他进程因等待sv而被挂起，就让它恢复运行，如果没有进程因等待sv而被挂起，就给它加1二信号量的相关函数#include<sys/sem.h>//semctl函数的作用是用来直接控制信号量信息intsemctl(intsem_</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 01:32:38</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2838</span></span>  </p> </article><article class="excerpt"> <header> <a title="ASP.NET" class="label label-important zj-del-target" href="/category/56">ASP.NET<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/22163" title="在 ASP.NET 中执行 URL 重写" target="_blank" onclick="return recordId('',)">在 ASP.NET 中执行 URL 重写 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/22163" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/16.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/22163';}else{window.open('/article/22163');}" style="cursor: pointer;">在ASP.NET中执行URL重写发布日期：8/23/2004|更新日期：8/23/2004ScottMitchell4GuysFromRolla.com适用范围：Microsoft®ASP.NET摘要：介绍如何使用MicrosoftASP.NET执行动态URL重写。URL重写是截取传入Web请求并自动将请求重定向到其他URL的过程。讨论实现URL重写的各种技术，并介绍执行URL重写的一些实际情况。下载本文的源代码。本页内容引言URL重写的常见用法请求到达I</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 23:54:05</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2837</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/scala/1/p/1">首页</a></li> <li class="prev-page"><a 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