如何从 List<string> 中查找所有重复项? [英] How to find all duplicate from a List<string>?

问题描述

我有一个 List<string> 有一些重复的单词.我需要找到所有重复的单词.

I have a List<string> which has some words duplicated. I need to find all words which are duplicates.

有什么技巧可以全部搞定吗?

Any trick to get them all?

推荐答案

在 .NET framework 3.5 及更高版本中，您可以使用 Enumerable.GroupBy 来返回重复键的可枚举，然后过滤取出任何具有 <=1 的 Count 的枚举，然后选择它们的键以返回到单个枚举:

In .NET framework 3.5 and above you can use Enumerable.GroupBy which returns an enumerable of enumerables of duplicate keys, and then filter out any of the enumerables that have a Count of <=1, then select their keys to get back down to a single enumerable:

var duplicateKeys = list.GroupBy(x => x)
                        .Where(group => group.Count() > 1)
                        .Select(group => group.Key);

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