如何在List<string>中查找List有重复值 [英] How to find List has duplicate values in List&lt;string&gt;

问题描述

如何判断List是否有重复值?

How to find whether the List<string> has duplicate values or not ?

我尝试使用以下代码.有没有最好的方法来实现?

I tried with below code. Is there any best way to achieve ?

var lstNames = new List<string> { "A", "B", "A" };

if (lstNames.Distinct().Count() != lstNames.Count())
{
    Console.WriteLine("List contains duplicate values.");
}

推荐答案

尽量使用 GroupBy 和 Any like;

Try to use GroupBy and Any like;

lstNames.GroupBy(n => n).Any(c => c.Count() > 1);

GroupBy 方法；

根据指定的键对序列的元素进行分组选择器函数并使用指定功能.

Groups the elements of a sequence according to a specified key selector function and projects the elements for each group by using a specified function.

Any 方法，它返回布尔值;

确定序列的任何元素是否存在或满足条件.

Determines whether any element of a sequence exists or satisfies a condition.

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