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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">3045</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/9253" title="github搭建个人主页" target="_blank" onclick="return recordId('',)">github搭建个人主页 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9253" 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/9253';}else{window.open('/article/9253');}" style="cursor: pointer;">GitHubPages是由GitHub免费提供的静态空间托管服务，它利用Git技术方便快捷地部署网页文件，支持绑定个人域名。GitHubPages存在的本意是为了给开发者提供一处宣传和演示作品的地方，但只要你会用Git，就能够免费使用它，我的个人主页便是利用它搭建而成。准备：注册GitHub服务，下载安装GitforWindows（选择下载类似于Git-1.7.*-preview.exe的文件）打开安装好的GitBash，依次输入：gitconfig--g</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 09:26:48</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3045</span></span>  </p> </article><article class="excerpt"> <header> <a title="SqlServer" class="label label-important zj-del-target" href="/category/46">SqlServer<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/7379" title="sql临时表:SQL Server中的临时表和表变量" target="_blank" onclick="return recordId('',)">sql临时表:SQL Server中的临时表和表变量 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7379" 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/7379';}else{window.open('/article/7379');}" style="cursor: pointer;">在SQLServer的性能调优中，有一个不可比拟的问题：那就是如何在一段需要长时间的代码或被频繁调用的代码中处理临时数据集?表变量和临时表是两种选择。在SQLServer的性能调优中，有一个不可比拟的问题：那就是如何在一段需要长时间的代码或被频繁调用的代码中处理临时数据集?表变量和临时表是两种选择。记得在给一家国内首屈一指的海运公司作SQLServer应用性能评估和调优的时候就看到过大量的临时数据集处理需求，而他们的开发人员就无法确定什么时候用临时表，什么</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 01:54:05</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3045</span></span>  </p> </article><article class="excerpt"> <header> <a title="SqlServer" class="label label-important zj-del-target" href="/category/46">SqlServer<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/7235" title="JDBC操纵数据库的步骤（以SQLServer为例）" target="_blank" onclick="return recordId('',)">JDBC操纵数据库的步骤（以SQLServer为例） </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7235" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/16.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/7235';}else{window.open('/article/7235');}" style="cursor: pointer;">JDBC的简介JDBC（JavaDataBaseConnectivity,java数据库连接）是一种用于执行SQL语句的JavaAPI，可以为多种关系数据库提供统一访问，它由一组用Java语言编写的类和接口组成。JDBC为工具/数据库开发人员提供了一个标准的API，据此可以构建更高级的工具和接口，使数据库开发人员能够用纯JavaAPI编写数据库应用程序，操作不同的数据库需要使用不同的JDBC。JDBC编程步骤一、LoadtheDriver加载JDBC驱动程</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 01:53:53</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3045</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/18.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">3045</span></span>  </p> </article><article class="excerpt"> <header> <a title="MySql" class="label label-important zj-del-target" href="/category/47">MySql<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/6177" title="深入解析MySQL分区（Partition）功能" target="_blank" onclick="return recordId('',)">深入解析MySQL分区（Partition）功能 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6177" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/1.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/6177';}else{window.open('/article/6177');}" style="cursor: pointer;">自5.1开始对分区(Partition)有支持=水平分区（根据列属性按行分）=举个简单例子：一个包含十年发票记录的表可以被分区为十个不同的分区，每个分区包含的是其中一年的记录。===水平分区的几种模式：===*Range（范围）–这种模式允许DBA将数据划分不同范围。例如DBA可以将一个表通过年份划分成三个分区，80年代（1980's）的数据，90年代（1990's）的数据以及任何在2000年（包括2000年）后的数据。*Hash（哈希）–这中模式允许DB</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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