使用 LINQ 将列表拆分为子列表 [英] Split List into Sublists with LINQ

问题描述

有什么办法可以将一个List 分成几个单独的SomeObject 列表，使用项目索引作为每个拆分的分隔符?

Is there any way I can separate a List<SomeObject> into several separate lists of SomeObject, using the item index as the delimiter of each split?

举个例子:

我有一个 List 并且我需要一个 List> 或 List[]，这样每个结果列表都将包含原始列表的一组 3 个项目(按顺序).

I have a List<SomeObject> and I need a List<List<SomeObject>> or List<SomeObject>[], so that each of these resulting lists will contain a group of 3 items of the original list (sequentially).

例如:

• 原始列表:[a, g, e, w, p, s, q, f, x, y, i, m, c]

结果列表:[a, g, e], [w, p, s], [q, f, x], [y, i, m], [c]

我还需要将结果列表大小作为此函数的参数.

I'd also need the resulting lists size to be a parameter of this function.

推荐答案

试试下面的代码.

public static IList<IList<T>> Split<T>(IList<T> source)
{
    return  source
        .Select((x, i) => new { Index = i, Value = x })
        .GroupBy(x => x.Index / 3)
        .Select(x => x.Select(v => v.Value).ToList())
        .ToList();
}

这个想法是首先按索引对元素进行分组.除以三的效果是将它们分成3组.然后将每组转换为列表，将List的IEnumerable转换为ListLists

The idea is to first group the elements by indexes. Dividing by three has the effect of grouping them into groups of 3. Then convert each group to a list and the IEnumerable of List to a List of Lists

这篇关于使用 LINQ 将列表拆分为子列表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！