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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">2917</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/14509" title="《Linux内核修炼之道》精华分享与讨论（9）——" target="_blank" onclick="return recordId('',)">《Linux内核修炼之道》精华分享与讨论（9）—— </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14509" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/12.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/14509';}else{window.open('/article/14509');}" style="cursor: pointer;">推荐博文：Linux内核“问题门”——学习问题、经验集锦推荐下载：《Linux内核修炼之道》精华版之方法论“世界上最缺的不是金钱，而是资源。”当我在一份报纸上看到这句大大标题时，我的第一反应是——作者一定是个自然环保主义者，然后我在羞愧得反省自身的同时油然生出一股对这样的无产主义理想者无比崇敬的情绪来。于是，我继续往下看，“因此在XXX还未正式面市之时，前来咨询的客户已经不少，这些有眼光的购房者明白，谁能在目前最好的购房</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 22:16:48</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2917</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/11084" title="MapReduce 模式、算法和用例" target="_blank" onclick="return recordId('',)">MapReduce 模式、算法和用例 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11084" 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/11084';}else{window.open('/article/11084');}" style="cursor: pointer;">本文译自MapreducePatterns,Algorithms,andUseCases在这篇文章里总结了几种网上或者论文中常见的MapReduce模式和算法，并系统化的解释了这些技术的不同之处。所有描述性的文字和代码都使用了标准hadoop的MapReduce模型，包括Mappers,Reduces,Combiners,Partitioners,和sorting。如下图所示。基本MapReduce模式计数与求和问题陈述:有许多文档，每个文档都有一些字段组</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 09:29:31</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2917</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/7384" title="输出，变量的使用，子查询，逻辑语句，循环，ca" target="_blank" onclick="return recordId('',)">输出，变量的使用，子查询，逻辑语句，循环，ca </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7384" 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/7384';}else{window.open('/article/7384');}" style="cursor: pointer;">--------------输出----------------print'helloworld'--以文本形式输出select'helloworld'--以网格形式输出,也可以设置成以文本形式输出print'abc'+'cde'print3+5print'ab'+5--出错,'ab'不能转换为intprint'ab'+convert(varchar,5)--输出ab5print'2'+5--输出7,因为'2'能自动转换为整型数据2------------</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">2917</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/12.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">2917</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/600" title="Mysql编写定时任务事件" target="_blank" onclick="return recordId('',)">Mysql编写定时任务事件 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/600" 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/600';}else{window.open('/article/600');}" style="cursor: pointer;">原文:Mysql编写定时任务事件场景：例如：某系统，用户每天只能拥有一次的抽奖机会，抽过后当天就不可再抽，但是过了24：00点后用户就重新拥有一次抽奖机会。像这种需要数据库定时对某个字段进行更新操作的任务，完全可以通过数据库本身的事件机制进行操作，而服务器端也不需要用额外的代码进行这种监控定时的操作。Mysql:本文讨论的是Mysql数据库，EventScheduler事件调度器应该是在Mysql5.1引入的，所以使用定时任务调度时，请注意查看你的Mysq</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 01:32:11</span></span> <span 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