如何仅使用LINQ从列表中选择长度不同的部分 [英] How to select sections of differing lengths from list using LINQ only

问题描述

我有一个名为复杂"类型的列表:

I have a List of a type named 'Complex':

List<Complex> list = new List<Complex>();
...
class Complex
{
  public string Header { get; set; }
  ...
  ...
  ...
}

列表中有一些重复的标题，这些标题指示新节的开始.每个部分的长度可能不同，如下所示:

There are some repeated headers in list, and these indicate the start of new sections. Each section may be of a different length, as shown below:

start 1 2 3 4 5 6 7 start 1 2 3 start 1 2 3 4 5 6 start 1 start 1 2

我想使用LINQ获得类型为Complex的所有可能的子列表.也就是说，所有带有标题的对象，如下所示:

I would like to get all possible sublists of type Complex using LINQ; that is, all objects with headers, as follows:

• 1 2 3 4 5 6 7
• 1 2 3
• 1 2 3 4 5 6
• 1
• 1 2

如何仅使用LINQ完成此操作?

How can I accomplish this using LINQ only?

列表是在html页面解析过程中创建的

edit: List is created during html page parsing

<tr>
                                                <td>00:00<!--//-00:00--></td>
<td>15:00<!--//-00:00--></td>
<td class="txt_left"><a href="">News</a></td>
<td><a href="/TsV2/TV_Video_On.asp?PROG_CODE=TVCR0114">
<img src="/images/new/sub_new/icon_play01_off.gif" alt="play"  class="rollover"/></a></td>

</tr>

<tr>
                                                <td>00:15<!--//-00:00--></td>
<td>15:15<!--//-00:00--></td>
<td class="txt_left">
<a href="Tv_Pagego.asp?PROG_CODE=TVCR0556">Nice one</a></td>
<td><a href="/TV2w/TV_2Video_On.asp?PROG_CODE=TVCR0556"><img src="/images/new/sub_new/icon_play01_off.gif" alt="play"  class="rollover"/></a></td>

</tr>

推荐答案

static void Main(string[] args)
        {
            var seq = new object[] {"start", 1, 2, 3, 4, "start", 1, 2, 3, "start", 1, 2, "start", 1};

            var no = 0;

            var test = (from i in seq select new {SeqNo = (i.ToString() == "start" ? no++ : no), Item = i}).Where( x => x.Item.ToString() != "start").GroupBy( y => y.SeqNo ).Select( z => z.ToArray()).ToArray();


        }

或

var test = (from i in seq
                       group i by i.ToString() == "start" ? ++no : no into g
                       select g.Where( gi => gi.ToString() != "start" ).ToArray()
                       ).ToArray()
                       ;

ToArray 语句不是必需的

这篇关于如何仅使用LINQ从列表中选择长度不同的部分的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！