我如何遍历一个IGrouping< T>接口？ [英] How do I iterate an IGrouping<T> Interface?

问题描述

Ive得到了部份非常恼人的问题，我已经分组的一组数据，我不能让该组内的数据。我能到的键位而不是数据。

Ive got ths really annoying issue I have grouped a set of data and I cant get to the data within the group. I can get to the key bit not the data..

我有数据的负载是形式

Data.Period = x
Data.Adjustment = y

我执行GROUPBY

I perform a GroupBy

var groupedData = Data.GroupBy(x => x.Period new {x.Period});

这带回（根据LINQ）我是开始寻找我多么希望它的分层数据。我还想通过的内容，但不能遍历......我该怎么办呢？和我怎么...

This brings back (according to linq) my hierarchical data which is starting to look how I want it. Id like to iterate through the contents but cant...How do I do this? and how do I...

工作如何才能到Data.Adjustment不使用投影。而且我不希望因为我必须执行另一组....帮助项目呢！ ： - ）

Work how to get to the Data.Adjustment without using a projection. And I dont want to project yet because I have to perform another grouping....help! :-)

推荐答案

的 IGrouping< TKEY的，TElement> 接口继承的IEnumerable< TElement> ：

foreach (var group in groupedData)
{
    var groupKey = group.Key;
    foreach (var groupedItem in group)
        DoSomethingWith(groupKey, groupedItem);
}

我注意到，你不过是最好使用此为您查询：

I note that you will be better off using this for your query, however:

var groupedData = Data.GroupBy(x => x.Period); 

而不是这样的：

rather than this:

var groupedData = Data.GroupBy(x => new {x.Period}); 

如果，例如，你想平均的调整，你可以这样做：

If, for example, you wanted to average the adjustments, you could do this:

foreach (var group in groupedData)
    Console.WriteLine("Period: {0}; average adjustment: {1}", group.Key, group.Average(i => i.Adjustment));

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