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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">2929</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/8421" title="Oracle很实用的汇总报表实现方式！grouping_id" target="_blank" onclick="return recordId('',)">Oracle很实用的汇总报表实现方式！grouping_id </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8421" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/19.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/8421';}else{window.open('/article/8421');}" style="cursor: pointer;">在财务系统或者其他报表统计的功能里我想类似下面这张报表的case很多，有了grouping_id函数之后会轻松easy实现，不菲催费之力序号项目上年本年增减日均余额成本率日均余额成本率日均余额成本率总计一银行借款1用于商业票据额度国家开发银行2其它授信额度国家开发银行美国银行二集团拆入三总部拆入解析：此表是三级汇总，银行汇总到额度（商业额度、其他额度），各种额度汇总到拆入方式（银行借款、集团拆入、总部拆入）、拆入方式汇总总计。grouping_id可以实现</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 01:55:09</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2929</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/8293" title="uva 10051 Tower of Cubes(DAG最长路）" target="_blank" onclick="return recordId('',)">uva 10051 Tower of Cubes(DAG最长路） </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8293" 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/8293';}else{window.open('/article/8293');}" style="cursor: pointer;">题目连接：10051-TowerofCubes题目大意：有n个正方体，从序号1~n，对应的每个立方体的6个面分别有它的颜色（用数字给出），现在想要将立方体堆成塔，并且上面的立方体的序号要小于下面立方体的序号，相邻的面颜色必须相同。输出最高值和路径。解题思路：因为立方体可以旋转，所以一个序号的立方体对应这6种不同的摆放方式，可以将问题理解成DAG最长路问题，只是搜索范围是从i+1开始到n。然后记录路径要开两个2维数组。路径不唯一，随便输出一条。#includ</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 01:55:00</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2929</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/6640" title="关于含有标识字段的数据表中记录的插入问题解决" target="_blank" onclick="return recordId('',)">关于含有标识字段的数据表中记录的插入问题解决 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6640" 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/6640';}else{window.open('/article/6640');}" style="cursor: pointer;">今天碰到一个问题在存储过程里添加一条记录InsertTableName(Field1,Field2,Field3)value(Value1,Value2,Value3);由于TableName中有一个标识字段Field_ID,于是给我返回错误信息无法将NULL值插入Field_ID。非常郁闷，Field_ID是自增长的为什么还要我手动插入呢？缺省情况下IDENTITY_INSERT为OFF，不可显示插入Field_ID的值。最后的勉强的解决办法是：一,Se</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 01:53:20</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2929</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/5348" title="zju 1003. Emergency (25)" target="_blank" onclick="return recordId('',)">zju 1003. Emergency (25) </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/5348" 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/5348';}else{window.open('/article/5348');}" style="cursor: pointer;">http://pat.zju.edu.cn/contests/pat-a-practise/1003最短路代码：#include<iostream>#include<cstdio>#include<cstring>#include<cmath>#include<algorithm>#include<vector>#include<set>#include<map>#include<string>#include<queue>#include<stack>#</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 01:51:51</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2929</span></span>  </p> </article><div class="pagination" 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