将列表元素分组到字典 [英] Grouping list elements to dictionary

问题描述

我有一个包含8个元素的列表：

I have a list that contains 8 elements:

ConfigFile.ControllerList

此列表是以下类型：

List<Controller>

如何将Controllers从ControllerList添加到3个字典键。字典如下：

How can i add Controllers from ControllerList to 3 dictionary keys. Dictionary is like:

Dictionary<int, List<Controller>> ControllerDictionary = new Dictionary<int, List<Controller>>();

我要添加前3个控制器到字典键0，然后要添加下一个3个控制器到字典键1，最后要添加最后2个控制器到字典键2.我该怎么做？

I want to add first 3 controllers to dictionary key 0, then want to add next 3 controllers to dictionary key 1 and lastly want to add last 2 controllers to dictionary key 2. How can i do that?

推荐答案

code> / 将列表分成子列表：

You can use / to split the list into sub-list:

var ControllerDictionary = ControllerList
    .Select((c, i) => new { Controller = c, Index = i })
    .GroupBy(x => x.Index / maxGroupSize)
    .Select((g, i) => new { GroupIndex = i, Group = g })
    .ToDictionary(x => x.GroupIndex, x => x.Group.Select(xx => xx.Controller).ToList());

这个想法是首先按索引对元素进行分组，然后将它们除以 int maxGroupSize（在你的情况下为3）。然后将每个组转换为列表。

The idea is to first group the elements by indexes, then divide them by an int maxGroupSize(in your case 3). Then convert each group to a list.

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