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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">2916</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/10.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">2916</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/13528" title="Petshop4.0之简单工厂模式" target="_blank" onclick="return recordId('',)">Petshop4.0之简单工厂模式 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13528" 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/13528';}else{window.open('/article/13528');}" style="cursor: pointer;">抽象工厂模式是一种创建模式，用于当需要时返回一系列相关类中的某一个，而每一个类都能根据需要返回不同的对象时使用。它可以快速得创建产品实例，使提升了应用程序的可扩展性，减少模块之间的耦合。抽象工厂模式包括4种对象。（1）抽象工厂接口或类，它的创建与应用程序业务逻辑无关，通常使用接口或者抽象类实现。（2）具体工厂类,它们的创建与业务逻辑有着密切的关系，通常使用具体的类实现。通过调用类中的方法可获得具体的产品实例。（3）抽象产品接口或类，该对象包括具体产品的父类</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 22:04:55</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2916</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/7071" title="Oracle Class1. Oracle 入门(rdbms结构)" target="_blank" onclick="return recordId('',)">Oracle Class1. Oracle 入门(rdbms结构) </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7071" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/9.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/7071';}else{window.open('/article/7071');}" style="cursor: pointer;">------------------------2013-5-4------------------------createuser"tempuser2"profile"DEFAULT"identifiedby"tempuser2"defaulttablespace"USERS"accountunlock;--profile"DEFAULT"是区分大小写的。defaulttablespace"USERS"是区分大小写的。createuser"TEMPUSE</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 01:53:43</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2916</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/4534" title="[SQL]不要让SQLServer帮你自动转换SQL命令中的" target="_blank" onclick="return recordId('',)">[SQL]不要让SQLServer帮你自动转换SQL命令中的 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/4534" 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/4534';}else{window.open('/article/4534');}" style="cursor: pointer;">为什么不要让SQLServer帮你自动转换SQL命令中的数据类型ReportDate：2003/12/5Preparedby：郑昀Articlelastmodifiedon2004-2-16Theinformationinthisarticleappliesto:üMicrosoftSQLServer2000,7.0问题陈述:有一天，执行SELECT*FROMXXX_ORIGINAL_20031205wheremsgid=62010388000012语句，</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 01:33:48</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2916</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/283" title="谷歌浏览器的源码分析(10)" target="_blank" onclick="return recordId('',)">谷歌浏览器的源码分析(10) </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/283" 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/283';}else{window.open('/article/283');}" style="cursor: pointer;">上一次已经分析到输入字符后，就需要把这些关键字去查找历史的连接，或者相关的内容，那么可多米的浏览器又是从那里去找到这些数据呢？现在就来分析这方面相关的内容。它主要通下面的函数来实现：#001voidAutocompleteEdit::UpdatePopup(){冻结输入。#002ScopedFreezefreeze(this,GetTextObjectModel());设置正在输入过程中。#003SetInputInProgress(true);#004如</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">2916</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/date/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/date/1/p/420">上一页</a></li> <li><a href="/search/date/1/p/419">419</a></li><li><a href="/search/date/1/p/420">420</a></li><li class="active"><span>421</span></li><li><a href="/search/date/1/p/422">422</a></li><li><a href="/search/date/1/p/423">423</a></li> <li class="next-page"><a 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