您可以使用 Distinct 运算符。

You can remove duplicates using the Distinct operator.

有两个重载 - 一个使用默认的相等比较器类型（对于一个自定义类型将调用 Equals（）方法类型） 。第二个允许你提供自己的平等比较器。它们都会返回代表原始集的新序列，而不会出现重复。 这两个重载实际上都不会修改您的初始集合 - 它们都会返回排除重复的新序列。。

There are two overloads - one uses the default equality comparer for your type (which for a custom type will call the Equals() method on the type). The second allows you to supply your own equality comparer. They both return a new sequence representing your original set without duplicates. Neither overload actually modifies your initial collection - they both return a new sequence that excludes duplicates..

如果您只想查找重复项，您可以使用 GroupBy 这样做：

If you want to just find the duplicates, you can use GroupBy to do so:

var groupsWithDups = list.GroupBy( x => new { A = x.A, B = x.B, ... }, x => x ) 
                         .Where( g => g.Count() > 1 );

要从类似 IList<> 你可以做：

yourList.RemoveAll( yourList.Except( yourList.Distinct() ) );