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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">2648</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/6016" title="学习Oracle日记（二）" target="_blank" onclick="return recordId('',)">学习Oracle日记（二） </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6016" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/15.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/6016';}else{window.open('/article/6016');}" style="cursor: pointer;">＃１.查询语句中使用函数@1.round(d1,d2)用于数字的四舍五入d1表示数字d2表示小数点后的位数（d2不写默认为零）@2.trunc(d1,d2)截取去尾法@3.日期函数sysdateselectsysdatefromdual;----获取系统当前时间@4.日期数据相减，得到两个日期之间的天数差不足一天用小数表示@5.months_between(d1,d2)得到d1,d2两个日期数据之间所差的月份小数表示@6.计算d2个月之前的时间点add_m</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 01:52:38</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2648</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/5496" title="委托事件简写与原来写法 (临时函数)转" target="_blank" onclick="return recordId('',)">委托事件简写与原来写法 (临时函数)转 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/5496" 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/5496';}else{window.open('/article/5496');}" style="cursor: pointer;">publicMainPage(){this.InitializeComponent();//简写this.Loaded+=(sender,e)=>{MessageBox.Show("d");MessageBox.Show("ss");};//原来写法this.Loaded+=newRoutedEventHandler(MainPage_Loaded);}voidMainPage_Loaded(objectsender,RoutedEventArgse){/</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 01:52:04</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2648</span></span>  </p> </article><article class="excerpt"> <header> <a title="操作系统" class="label label-important zj-del-target" href="/category/34">操作系统<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/1948" title="Samba 3.5.10 发布" target="_blank" onclick="return recordId('',)">Samba 3.5.10 发布 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/1948" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/17.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/1948';}else{window.open('/article/1948');}" style="cursor: pointer;">Samba现在有三个活动分支，分别是4.0、3.6.x和3.5.x，今天发布的3.5.10是一个bugfix版本而已。Samba，是种自由软件，用来让UNIX系列的操作系统与微软Windows操作系统的SMB/CIFS（ServerMessageBlock/CommonInternetFileSystem）网络协定做连结。在目前的版本（v3），不仅可存取及分享SMB的资料夹及打印机，本身还可以整合入WindowsServer的网域、扮演为网域控制站（Dom</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 01:32:43</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2648</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/1158" title="开机自动连接宽带程序" target="_blank" onclick="return recordId('',)">开机自动连接宽带程序 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/1158" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/10.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/1158';}else{window.open('/article/1158');}" style="cursor: pointer;">假期回家，正好赶上家里装宽带（以前都是用路由器和别人家合着用），说实话我还是第一次使用adsl宽带，对这东西还真不熟悉，顺便查了一下什么是adsl，简单的讲就是用频分技术把普通的电话线分成三个独立的信道，分别用于打电话，网络上行，网络下行，互不影响；这个功能我想主要是由所谓的“猫”完成的吧！在实际使用时发现每次上网前都要先连接，我想了一下：现在的adsl宽带都是不限时、不限流量的，没必要节省，所以我们完全有必要开机就连上宽带，省去每次都去手动连接的繁琐。说</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 01:32:25</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2648</span></span>  </p> </article><article class="excerpt"> <header> <a title="操作系统" class="label label-important zj-del-target" href="/category/34">操作系统<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/459" title="Dotfuscator类重命名方法解析" target="_blank" onclick="return recordId('',)">Dotfuscator类重命名方法解析 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/459" 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/459';}else{window.open('/article/459');}" style="cursor: pointer;">Dotfuscator是专业的.NET程序代码混淆工具，拥有重命名、字符串加密、流程模糊、自定义规则和水印等功能，倍受开发人员喜爱。其中类重命名的使用方法非常普遍，涉及到既要保护代码信息，又要在以后能实现运行维护及多程序协同工作。那么类重命名到底有几种方法？每种方法是如何实现的？接下来将解析各种类重命名方法及其实现过程。整体重命名默认的类重命名方法是整体重命名，会把类命名为一个新的、简单的名字。这是最简单的一种重命名方式。举例如下：原来名字新名字Preem</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 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