How Can I Split a Collection into Sub-Collections Using LINQ?

Use LINQ to divide the collection into sub-collections

Splitting a collection into smaller parts is a common programming task. Using LINQ (Language Integrated Query) you can achieve this with a simple extension method.

Divide the set into N parts

The

extension method Split receives as input a collection and the desired number of parts and returns a IEnumerable<IEnumerable> representing the subcollection. This algorithm divides elements into parts based on the remainder when the current index is divided by the number of parts.

Implementation:

<code class="language-csharp">static class LinqExtensions
{
    public static IEnumerable<IEnumerable<T>> Split<T>(this IEnumerable<T> list, int parts)
    {
        int i = 0;
        var splits = from item in list
                     group item by i++ % parts into part
                     select part.AsEnumerable();
        return splits;
    }
}</code>

Usage:

The

Split method can be used on any IEnumerable collection. For example, to split a list of numbers into 3 parts:

<code class="language-csharp">var numbers = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var parts = numbers.Split(3);</code>

This will return a IEnumerable containing 3 IEnumerable collections, each containing a subset of the original list:

<code>部分1：{ 1, 4, 7 }
部分2：{ 2, 5, 8 }
部分3：{ 3, 6, 9 }</code>

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