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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">2873</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/7948" title="SIMCom智能设备扫描头接口说明" target="_blank" onclick="return recordId('',)">SIMCom智能设备扫描头接口说明 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7948" 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/7948';}else{window.open('/article/7948');}" style="cursor: pointer;">DocumentTitle:SIMCom智能设备扫描头接口说明Version:1.01Date:2014-02-13Status:ReleaseDocumentControlID:SIM0005Writer:Yunqi.miao通过程序代码开启扫描通过广播实现，广播名称为:android.intent.action.SIMSCAN举例:context.sendBroadcast(newIntent("android.intent.action.SIMSCA</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 01:54:39</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2873</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/7639" title="如何彻底删除TFS上的团队项目" target="_blank" onclick="return recordId('',)">如何彻底删除TFS上的团队项目 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7639" 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/7639';}else{window.open('/article/7639');}" style="cursor: pointer;">最近在进行TFS的测试，在TFS服务器上建立了很多项目，发现在TeamExplorer中，只能移除团队项目，这种移除，只是将项目从当前TeamExplorer项目列表中删除，下一次Connect到TFS服务器时，或者刷新一下，就会看到项目依然存在。最后发现，必须使用命令行的方式来删除项目，具体使用方法如下：1、微软提供了一个删除工具，位于C:\ProgramFiles\MicrosoftVisualStudio9\Common7\IDE\目录下，名为TFS</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 01:54:19</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2873</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/6930" title="Oracle Class10. 集合和成员函数(pl/sql表和记" target="_blank" onclick="return recordId('',)">Oracle Class10. 集合和成员函数(pl/sql表和记 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6930" 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/6930';}else{window.open('/article/6930');}" style="cursor: pointer;">------------------------2013-5-21------------------------定义表的类型typetablenameistableofcol_defindexbybinary_integer;声明表的类型Tablenametablenamepl/sql表临时使用，像数组一样的对象。包含一列和一个主键不能对列和主键进行命名列可以是任何标量数据类型主键必须是binary_integer类型大小没有限制引用：tablename</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 01:53:35</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2873</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/6549" title="在ContentResolver中使用Group By" target="_blank" onclick="return recordId('',)">在ContentResolver中使用Group By </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6549" 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/6549';}else{window.open('/article/6549');}" style="cursor: pointer;">使用ContentProvider查询短信，希望可以在ContentResolver.query中使用GroupBy，发现系统并没有提供接口或者可用字段。探究竟首先我们来看看query函数：publicfinalCursorquery(Uriuri,String[]projection,Stringselection,String[]selectionArgs,StringsortOrder){returnquery(uri,projection,sele</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 01:53:14</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2873</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/6069" title="Linq To Sql 中使用lambda表达式实现Left Join" target="_blank" onclick="return recordId('',)">Linq To Sql 中使用lambda表达式实现Left Join </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6069" 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/6069';}else{window.open('/article/6069');}" style="cursor: pointer;">网上也有很多有关LinqToSql实现Leftjoin的例子，不过使用lambda的不多，就算使用lambda的，也讲得很含糊，本来不需要讲太多废话的，硬要讲得高深莫测，显得好厉害。那些高深的东西在这里我也不讲了，也不会讲，直接上代码就知道了：当前有两个表，TUsers与TUserInfo，两者通过UserID关联，而TUsers表记录的是必须的数据，而TUserInfo记录是一些附件的数据，因此在TUserInfo中不一定有数据。使用LeftJoin获取</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 01:52:42</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2873</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/ajax/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/ajax/1/p/416">上一页</a></li> <li><a href="/search/ajax/1/p/415">415</a></li><li><a href="/search/ajax/1/p/416">416</a></li><li class="active"><span>417</span></li><li><a href="/search/ajax/1/p/418">418</a></li><li><a href="/search/ajax/1/p/419">419</a></li> <li class="next-page"><a href="/search/ajax/1/p/418">下一页</a></li> <li><a href="/search/ajax/1/p/2924">末页</a></li> <li><span>共 2924页,共29234条</span></li> </ul> </div> </div> </div>   <style type="text/css"> .d_postlist .text { /* height: 30px; */ display: block; /* height: 100%; */ font-size:14px !important; width:85%; } .zj-dynamic-info li{ margin: 10px 3px; } .zj-dynamic-info .zj-a{ color: blue; cursor: pointer; } </style> 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