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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">3128</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/10218" title="Kettle汇总时参数" target="_blank" onclick="return recordId('',)">Kettle汇总时参数 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/10218" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/6.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/10218';}else{window.open('/article/10218');}" style="cursor: pointer;">Kettle汇总时手动执行小时汇总命令：./kitchen.sh-norep-file/usr/local/evqm/kettle/kettle_scripts/rpt_hour.kjb-param:start_time='2015-2-310:00:00'-param:end_time='2015-2-311:00:00'-param:insert_time='2015-2-310:00:00'Kettle汇总时手动执行一天汇总命令：./kitchen.</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 09:27:19</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3128</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/8947" title="当使用RunWithElevatedPrivileges时如何修改“" target="_blank" onclick="return recordId('',)">当使用RunWithElevatedPrivileges时如何修改“ </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8947" 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/8947';}else{window.open('/article/8947');}" style="cursor: pointer;">今天在国外网站看到篇东东，感觉是一个细节问题，这里贴出来共享～通过使用RunWithElevatedPrivileges将使列表项的“修改者”一栏变为系统账户，如果要让“修改者”记录为当前用户，则以下代码可供参考：item["Editor"]=SPContext.Current.Web.CurrentUser;item["Author"]=SPContext.Current.Web.CurrentUser;item.SystemUpdate();[Crea</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 01:55:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3128</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/430" title="Representation Data in OpenCascade BRep" target="_blank" onclick="return recordId('',)">Representation Data in OpenCascade BRep </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/430" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/13.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/430';}else{window.open('/article/430');}" style="cursor: pointer;">RepresentationDatainOpenCascadeBReperyar@163.com摘要Abstract：现在的显示器大多数是光栅显示器，即可以看做一个像素的矩阵。在光栅显示器上显示的任何图形，实际上都是一些具有一种或多种颜色的集合。数学上精确表示的图形在显示器中只能用逼近的方式显示出来。本文主要对OpenCascade的BRep文件中用来显示曲线和曲面的离散数据结构进行说明。关键字：OpenCascade,BRep,Polygon,Trian</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 01:32:04</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3128</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/288" title="Mono介绍" target="_blank" onclick="return recordId('',)">Mono介绍 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/288" 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/288';}else{window.open('/article/288');}" style="cursor: pointer;">转载自：最近可能要用到Mono了，找了点资料，分享下Mono是一个由Novell公司（先前是Ximian）主持的项目。该项目的目标是创建一系列符合ECMA标准（Ecma-334和Ecma-335）的.NET工具，包括C#编译器和共通語言執行平臺。与微软的.NETFramework不同，Mono项目不仅可以运行于Windows系统上，还可以运行于Linux，FreeBSD，Unix，MacOSX和Solaris。Mono现由Novell持有双重许可，这和Qt</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 01:31:57</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3128</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/spring/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/spring/1/p/410">上一页</a></li> <li><a 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