如何比较两个无序序列(列表和数组)的相等性? [英] How can I compare two unordered sequences (list and array) for equality?

问题描述

我有一个字符串数组，说string str[] = {"a", "b"}

I have string array say string str[] = {"a", "b"}

和List<string> lst = new List<string> {"a", "b"}

如何确保字符串数组和列表包含相同的值. 注意:值可以为任意顺序，但必须具有相同的频率.

How can I make sure that both string array and list contains the same values. Note: The values can be in any order but must have the same frequency.

有人可以告诉我如何在LINQ中做到这一点吗?

Can anyone tell me how to do it in LINQ?

谢谢.

推荐答案

好吧，由于顺序无关紧要，但频率却如此，因此您需要对每个键进行计数，然后检查生成的键/计数对是否相等:

Okay, since order does not matter but frequncies do, you need to count each key, and then check that the resulting pairs of keys/counts are equal:

var first = str.GroupBy(s => s)
               .ToDictionary(g => g.Key, g => g.Count());

var second = lst.GroupBy(s => s)
                .ToDictionary(g => g.Key, g => g.Count());

bool equals = first.OrderBy(kvp => kvp.Key)
                   .SequenceEquals(second.OrderBy(kvp => kvp.Key));

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