如何在 C# List <T> LINQ 中同时查找重复项和原始项？

Question

我在这里阅读了几乎所有关于在 C# 中查找列表类型字符串中的重复项的答案，但我还没有真正找到我需要的解决方案。

假设我有一个列表：

List<String> list = new List<String>{"6","1","2","4","6","5","1","2","1","2"};

我要检索的是新列表中的重复值及其原始值，因此结果列表如下：

List<String> duplist = {"6","6","1","1","1,","2","2","2"};

Answer 1

我想到的第一个方法是：

List<String> duplist = list
    .GroupBy(str => str)
    .Where(g=> g.Count() != 1)
    .SelectMany(g => g)
    .ToList();

如果有人感兴趣，这里是查询语法：

var dups = from str in list
           group str by str into g
           where g.Count() != 1
           from str in g
           select str;

List<String> duplist = dups.ToList();

如何在 C# List <T> LINQ 中同时查找重复项和原始项？

How to find both duplicates and original in a C# List <T> LINQ?

c#

linq

list

duplicates