在 linq 中设置相等 [英] set equality in linq

问题描述

我有两个列表 A 和 B(列表).如何以最便宜的方式确定它们是否相等?我可以写类似'(A减B)联合(B减A)=空集'或将它们连接在一起并计算元素数量，但它相当昂贵.有解决办法吗?

I have two lists A and B (List). How to determine if they are equal in the cheapest way? I can write something like '(A minus B) union (B minus A) = empty set' or join them together and count amount of elements, but it is rather expensive. Is there workaround?

推荐答案

嗯，这取决于你如何解释你的列表.

Well, that depends on how you interpret your lists.

如果您将它们视为元组(因此列表中元素的顺序很重要)，那么您可以使用以下代码:

If you consider them as tuples (so the order of elements in lists matters), then you can go with this code:

    public bool AreEqual<T>(IList<T> A, IList<T> B)
    {
        if (A.Count != B.Count)
            return false;
        for (int i = 0; i < A.Count; i++)
            if (!A[i].Equals(B[i])) 
                return false;
    }

如果您将列表视为集合(因此元素的顺序无关紧要)，那么...我猜您使用了错误的数据结构:

If you consider your lists as sets (so the order of elements doesn't matter), then... you are using the wrong data structures I guess:

    public bool AreEqual<T>(IList<T> A, IList<T> B)
    {
        HashSet<T> setA = new HashSet<T>(A);
        return setA.SetEquals(B);
    }

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