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?
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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