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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">3017</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/10686" title="mini-httpd源码分析-mini-httpd.c之外总结" target="_blank" onclick="return recordId('',)">mini-httpd源码分析-mini-httpd.c之外总结 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/10686" 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/10686';}else{window.open('/article/10686');}" style="cursor: pointer;">version.h#defineSERVER_SOFTWARE"mini_httpd/1.2118oct2014"#defineSERVER_URL"http://www.acme.com/software/mini_httpd/"port.h#defineOS_linux#defineARCH_linux#defineHAVE_DAEMON#defineHAVE_SETSID#defineHAVE_WAITPID#defineHAVE_TM_GMTOFF</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 09:27:34</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3017</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/19270" title="[转]分布式数据库概述" target="_blank" onclick="return recordId('',)">[转]分布式数据库概述 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/19270" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/1.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/19270';}else{window.open('/article/19270');}" style="cursor: pointer;">From:http://fineboy.cnblogs.com/archive/2005/08/03/206395.html1．前言随着传统的数据库技术日趋成熟、计算机网络技术的飞速发展和应用范围的扩充，数据库应用已经普遍建立于计算机网络之上。这时集中式数据库系统表现出它的不足：数据按实际需要已在网络上分布存储，再采用集中式处理，势必造成通信开销大；应用程序集中在一台计算机上运行，一旦该计算机发生故障，则整个系统受到影响，可靠性不高；集中式处理引起系统的规</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 23:17:18</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3016</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/19252" title="DataGrid实现增删（带提示）改和分页" target="_blank" onclick="return recordId('',)">DataGrid实现增删（带提示）改和分页 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/19252" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/15.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/19252';}else{window.open('/article/19252');}" style="cursor: pointer;">或许大家会说，网上已经很多类似文章了，包括孟子的，为什么要再写一次？我想我们不仅仅要会实现，更多的是需要理解。下面先帖出代码，再分析一下其中的一些关键代码。数据库表名:tb1，其中有3个字段，分别是ID自增的主键、vNamevarchar(50)、iAgeint（以下代码没有做任何错误捕获处理）前台<%...@Pagelanguage="c#"Codebehind="WebForm5.aspx.cs"AutoEventWireup="false"Inher</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 23:17:04</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3016</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/myeclipse/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/myeclipse/1/p/416">上一页</a></li> <li><a href="/search/myeclipse/1/p/415">415</a></li><li><a href="/search/myeclipse/1/p/416">416</a></li><li class="active"><span>417</span></li><li><a href="/search/myeclipse/1/p/418">418</a></li><li><a href="/search/myeclipse/1/p/419">419</a></li> <li class="next-page"><a href="/search/myeclipse/1/p/418">下一页</a></li> <li><a href="/search/myeclipse/1/p/2924">末页</a></li> <li><span>共 2924页,共29234条</span></li> </ul> </div> </div> </div>   <style type="text/css"> .d_postlist .text { /* height: 30px; */ display: block; /* height: 100%; */ font-size:14px !important; width:85%; } .zj-dynamic-info li{ margin: 10px 3px; } .zj-dynamic-info .zj-a{ color: blue; cursor: pointer; } </style> <aside class="sidebar"> <div class="widget d_postlist"> <div class="title"> <h2>站内搜索</h2> </div> <ul> <li><div class="zj-search-box zj-pc-search-box"> <form class="searchform themeform" role="form" action="/search" method="get"> <input style="font-size: 120%; margin-top: 10px;" type="ext" class="search" name="search_word" placeholder="搜索从这里开始..." value=""> <i class="fa fa-search"></i> <button class="btn btn-primary" type="button" style="margin-left: -4px;height: 36px !important;"> <span class="zj-icon-text">搜索</span> </button> </form> </div></li> </ul> </div>   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