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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">2934</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/11343" title="虚拟机手机连接上的图形标识不见了解决" target="_blank" onclick="return recordId('',)">虚拟机手机连接上的图形标识不见了解决 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11343" 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/11343';}else{window.open('/article/11343');}" style="cursor: pointer;">奇怪的事情天天有，今天尤其多。使用虚拟机开发，当插上手机后，虚拟机会抢先获得手机的开发访问权限。在虚拟机里断开连接，删除掉手机之后，在宿主机xp下才能正常用如360手机助手来访问手机。正常情况下，手机插入后再虚拟机的右下脚会有一个方形的标示，如下图：奇怪的是今天竟然莫名奇妙的不见了，要在虚拟机和xp下切换手机的访问权很不方便。解决：点击虚拟机的最上面的“虚拟机”----------“移除设备”，然后找到手机设备后，在“状态栏显示”前面打勾就可以了。虚拟机手</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 09:29:41</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2934</span></span>  </p> </article><article class="excerpt"> <header> <a title="Oracle" class="label label-important zj-del-target" href="/category/45">Oracle<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/8421" title="Oracle很实用的汇总报表实现方式！grouping_id" target="_blank" onclick="return recordId('',)">Oracle很实用的汇总报表实现方式！grouping_id </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8421" 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/8421';}else{window.open('/article/8421');}" style="cursor: pointer;">在财务系统或者其他报表统计的功能里我想类似下面这张报表的case很多，有了grouping_id函数之后会轻松easy实现，不菲催费之力序号项目上年本年增减日均余额成本率日均余额成本率日均余额成本率总计一银行借款1用于商业票据额度国家开发银行2其它授信额度国家开发银行美国银行二集团拆入三总部拆入解析：此表是三级汇总，银行汇总到额度（商业额度、其他额度），各种额度汇总到拆入方式（银行借款、集团拆入、总部拆入）、拆入方式汇总总计。grouping_id可以实现</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 01:55:09</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2934</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/20.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">2934</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/14.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">2934</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/spark/1/p/1">首页</a></li> <li class="prev-page"><a 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