将列表或集合拆分为块[重复]

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Split a collection into `n` parts with LINQ? 19 answers
使用LINQ将集合拆分为`n`部分？ 19个答案
Split a List into smaller lists of N size 10 answers
将列表拆分为N个10个答案的较小列表

I have a program that will read the contents of a file into some sort of list or array. This list/array could contain any number of items. I need to split it into smaller groups, say of 50 items each and then do some processing on each item in each group.

我有一个程序，将文件的内容读入某种列表或数组。此列表/数组可以包含任意数量的项目。我需要将它分成更小的组，每组50项，然后对每组中的每个项目进行一些处理。

List<string> stuffFromFile = new List<string>();

while ((line = fileReader.ReadLine()) != null)
      {
           stuffFromFile.Add(line);
      }

I have been looking through some examples online about how to chunk stuff but to be honest, I don't really understand the examples and some of them seem overly complex. I just need something simple that will chunk/split/break the original list of items into groups of 50 and then let me iterate through each item in each group until the processing is complete.

我一直在网上查看一些关于如何分块的例子，但说实话，我并不真正理解这些例子，其中一些似乎过于复杂。我只需要一些简单的东西，将原始的项目列表分成/拆分/分成50个组，然后让我遍历每个组中的每个项目，直到处理完成。

The total number of items read in will most likely not be a number that I can divide evenly by 50 so most likely the last group may contain less than 50 items, but would still need to be processed just like the rest.

读入的项目总数很可能不是我可以均匀划分50的数字，因此最后一组最有可能包含少于50个项目，但仍需要像其他项目一样进行处理。

Can anyone help here? It sounds like it should be simple but I don't really know how to do it. I've seen example about using LINQ but I don't understand it either.

有人可以帮忙吗？这听起来应该很简单，但我真的不知道该怎么做。我见过关于使用LINQ的例子，但我也不理解它。

2 个解决方案

#1

Here's an extension method that will work with any list and any size chunks.

这是一个扩展方法，可以使用任何列表和任何大小的块。

public static List<List<T>> SplitList<T>(this List<T> me, int size = 50)
{
    var list = new List<List<T>>();
    for (int i = 0; i < me.Count; i += size)
        list.Add(me.GetRange(i, Math.Min(size, me.Count - i)));
    return list;
}

Use it like this:

像这样用它：

List<List<string>> chunksOf50 = stuffFromFile.SplitList();

#2

List<string> stuffFromFile = new List<string>() { "1", "2", "3", "4" }; //contents

while (stuffFromFile.Count > 0)
{
    List<string> newChunk = stuffFromFile.Take(50).ToList(); //Take up to 50 elements
    stuffFromFile.RemoveRange(0, newChunk.Count); // Remove the elements you took
}

#1