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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">3052</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/12200" title="我的大学--VC/MFC" target="_blank" onclick="return recordId('',)">我的大学--VC/MFC </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12200" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/20.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12200';}else{window.open('/article/12200');}" style="cursor: pointer;">VC基本操作四十条http://blog.csdn.net/liufei_learning/article/details/5262948MFC-控件变量源文档<http://blog.csdn.net/liufei_learning/article/details/5170368>MFC自定义消息源文档<http://blog.csdn.net/liufei_learning/archive/2009/12/10/4979923.aspx>VC运行时库源</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 09:30:13</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3052</span></span>  </p> </article><article class="excerpt"> <header> <a title="CSS" class="label label-important zj-del-target" href="/category/68">CSS<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11716" title="16 个新鲜的 CSS3 在线教程" target="_blank" onclick="return recordId('',)">16 个新鲜的 CSS3 在线教程 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11716" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/5.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11716';}else{window.open('/article/11716');}" style="cursor: pointer;">用CSS3制作令人印象深刻的产品展示使用jQuery和CSS3制作闪亮的旋钮控制使用CoffeeScript创建一个类iOS的界面使用CSS3制作报纸阅读制作一个CSS3动画菜单使用jQuery和CSS3制作更好的元素选择CSS3多级菜单，具有动画效果制作你的第一个Chrome扩展BounceBox提示插件色彩多样的滑动块使用jQuery和CSS3创建一个音频播放器CSS3和jQuery项目的模糊效果CSS3制作的动画按钮CSS3制作的圆形导航效果创建一个</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 09:29:55</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3052</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/11084" title="MapReduce 模式、算法和用例" target="_blank" onclick="return recordId('',)">MapReduce 模式、算法和用例 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11084" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11084';}else{window.open('/article/11084');}" style="cursor: pointer;">本文译自MapreducePatterns,Algorithms,andUseCases在这篇文章里总结了几种网上或者论文中常见的MapReduce模式和算法，并系统化的解释了这些技术的不同之处。所有描述性的文字和代码都使用了标准hadoop的MapReduce模型，包括Mappers,Reduces,Combiners,Partitioners,和sorting。如下图所示。基本MapReduce模式计数与求和问题陈述:有许多文档，每个文档都有一些字段组</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 09:29:31</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3052</span></span>  </p> </article><article class="excerpt"> <header> <a title="数据库相关" class="label label-important zj-del-target" href="/category/32">数据库相关<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/8932" title="LNK快捷方式漏洞利用方式 exp制作教程" target="_blank" onclick="return recordId('',)">LNK快捷方式漏洞利用方式 exp制作教程 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8932" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/3.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/8932';}else{window.open('/article/8932');}" style="cursor: pointer;">前言windows的shell32在处理控制面板程序的快捷方式文件时，存在一个漏洞，能够载入硬盘上的随意DLL文件，就可以运行随意代码。漏洞文件的生成到“控制面板”以下，右键点“显示”，点“创建快捷方式”，把快捷方式创建在桌面上。然后在桌面用WinHex打开“显示.lnk”文件。Offset0123456789ABCDEF000000004C0000000114020000000000C0000000L...........?..0000001000000</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 01:55:43</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3052</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/autocomplete/1/p/1">首页</a></li> <li class="prev-page"><a 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