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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">3023</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/3.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">3023</span></span>  </p> </article><article class="excerpt"> <header> <a title="C#" class="label label-important zj-del-target" href="/category/43">C#<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/7361" title="C#中日期函数的样式大全" target="_blank" onclick="return recordId('',)">C#中日期函数的样式大全 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7361" 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/7361';}else{window.open('/article/7361');}" style="cursor: pointer;">---------------------------------------------------------------------------------------------------------------------//获取日期+时间DateTime.Now.ToString();//2008-9-420:02:10DateTime.Now.ToLocalTime().ToString();//2008-9-420:12:12//获取日期</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 01:54:04</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3023</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/6682" title="SZU : A11 Sequence" target="_blank" onclick="return recordId('',)">SZU : A11 Sequence </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6682" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/8.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/6682';}else{window.open('/article/6682');}" style="cursor: pointer;">DescriptionWearegivenaintegersequence,yourjobisfindthelengthofthelongestcontiguoussubsequencethatisstrictlyincreasingorstrictlydecreasing.InputFirstnumber,representhowmanytestcases.Foreachtestcasethefirstnumberis.Thenpositiveinteg</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 01:53:22</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3023</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/6549" title="在ContentResolver中使用Group By" target="_blank" onclick="return recordId('',)">在ContentResolver中使用Group By </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6549" 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/6549';}else{window.open('/article/6549');}" style="cursor: pointer;">使用ContentProvider查询短信，希望可以在ContentResolver.query中使用GroupBy，发现系统并没有提供接口或者可用字段。探究竟首先我们来看看query函数：publicfinalCursorquery(Uriuri,String[]projection,Stringselection,String[]selectionArgs,StringsortOrder){returnquery(uri,projection,sele</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 01:53:14</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3023</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/3100" title="Carla Schroder：Linux网管的十大秘诀" target="_blank" onclick="return recordId('',)">Carla Schroder：Linux网管的十大秘诀 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/3100" 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/3100';}else{window.open('/article/3100');}" style="cursor: pointer;">早在CarlaSchroder编写第一本书《LinuxCookbook》之际，她就预想将来会写一本《LinuxNetworkingCookbook》作为姐妹篇，两者就像花生奶油和巧克力一样天然浑成。以下是她为那些想成为卓越Linux网管的人们所撰写的十大秘诀——无论你目前水平如何，它们都是非常值得参考的建议。除第一条之外，不分先后：1.研究并掌握TCP/IP包、UDP数据报及ICMP消息的结构。2.理解网络连接如何建立、维持和终止的相关细节。3.抓紧时间研</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 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