对List中的元素进行分组 [英] grouping the elements within a List

问题描述

我给了一个清单

Hi,

I gave a List

Name  Dep  YearofJoin
====================
x     d     2010
y     d     2010

a     g     2010
b     g     2010
c     g     2012
====================

我想分组元素基于Dep然后分组然后基于yearOf加入



我正在使用groupby（dep）但是我无法继续前进。



任何建议。



[edit]已添加代码块 - OriginalGriff [/ edit]

I want to group the elements based on Dep and then group then based on yearOf Joining

I am using groupby(dep) but am not able to move further.

Any suggestion.

[edit]Code block added - OriginalGriff[/edit]

推荐答案

根据您的查询，这些名称将属于一个具有相同Dep和相同YearofJoin的组。因此，从给定的例子中，我们将获得3组（2010_d），（2010_g）和（2012_g）

According to your query, those names would come under one group which has same Dep and same YearofJoin. Therefore, from the given example, we would get 3 groups (2010_d), (2010_g) and (2012_g)

var studentGroups = from s in students
	group s by string.Format("{0}_{1}", s.YearofJoin, s.Dep) into g
	select new { GroupId = g.Key, StudentInfo = g };


foreach (var sg in studentGroups)
{
	foreach (var s in sg.StudentInfo)
	{
	}
}

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