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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">2864</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/14714" title="最新防病毒软件排名：PC-cillin 拦截率第一名" target="_blank" onclick="return recordId('',)">最新防病毒软件排名：PC-cillin 拦截率第一名 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14714" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/19.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/14714';}else{window.open('/article/14714');}" style="cursor: pointer;">——趋势科技连续第二次在「实况」测试当中荣获恶意软件拦截第一名的成绩【2010年10月29日】趋势科技在NSSLabs2010年第三季度「消费类恶意软件防护产品集体测试报告」(ConsumerAnti-MalwareProductsGroupTestReport)当中凭借优异的长时间防护与社交工程恶意软件拦截率，荣获NSSLabs「推荐」的评价。根据测试，信息安全厂商对最新恶意网站的平均反应时间为13.5小时，唯独趋势科技的响应速度最快，只需三小时的反应时</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 22:19:15</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2864</span></span>  </p> </article><article class="excerpt"> <header> <a title="Android" class="label label-important zj-del-target" href="/category/57">Android<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/8642" title="【Android Developers Training】 8. 定义Actio" target="_blank" onclick="return recordId('',)">【Android Developers Training】 8. 定义Actio </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8642" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/9.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/8642';}else{window.open('/article/8642');}" style="cursor: pointer;">注：本文翻译自Google官方的AndroidDevelopersTraining文档，译者技术一般，由于喜爱安卓而产生了翻译的念头，纯属个人兴趣爱好。原文链接：http://developer.android.com/training/basics/actionbar/styling.htmlActionBar能够向你的用户提供易掌握的操作方法，同时也能帮助用户导航，但这不代表所有应用的Action都长一个模样。如果你希望将你的ActionBar风格进行</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 01:55:23</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2864</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/7948" title="SIMCom智能设备扫描头接口说明" target="_blank" onclick="return recordId('',)">SIMCom智能设备扫描头接口说明 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7948" 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/7948';}else{window.open('/article/7948');}" style="cursor: pointer;">DocumentTitle:SIMCom智能设备扫描头接口说明Version:1.01Date:2014-02-13Status:ReleaseDocumentControlID:SIM0005Writer:Yunqi.miao通过程序代码开启扫描通过广播实现，广播名称为:android.intent.action.SIMSCAN举例:context.sendBroadcast(newIntent("android.intent.action.SIMSCA</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 01:54:39</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2864</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/6069" title="Linq To Sql 中使用lambda表达式实现Left Join" target="_blank" onclick="return recordId('',)">Linq To Sql 中使用lambda表达式实现Left Join </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6069" 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/6069';}else{window.open('/article/6069');}" style="cursor: pointer;">网上也有很多有关LinqToSql实现Leftjoin的例子，不过使用lambda的不多，就算使用lambda的，也讲得很含糊，本来不需要讲太多废话的，硬要讲得高深莫测，显得好厉害。那些高深的东西在这里我也不讲了，也不会讲，直接上代码就知道了：当前有两个表，TUsers与TUserInfo，两者通过UserID关联，而TUsers表记录的是必须的数据，而TUserInfo记录是一些附件的数据，因此在TUserInfo中不一定有数据。使用LeftJoin获取</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 01:52:42</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2864</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/20086" title="求一整数的所有拆分方式" target="_blank" onclick="return recordId('',)">求一整数的所有拆分方式 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20086" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/7.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/20086';}else{window.open('/article/20086');}" style="cursor: pointer;">题目要求如图，思路是把每次生成的数的组合放到一数组中，然后再把数组放到List中，每次生成符合的数组的时候，先判断List中是否已有该数组，无则输出。源码下载：http://taotao.wsyren.com/download/intsplit.rar求一整数的所有拆分方式</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 23:28:07</span></span> <span class="muted"><i class="fa 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