C# 如何确定两个 HashSet 是否相等（按值，而不是按引用）？

How do you determine if two HashSets are equal (by value, not by reference)?

提问by Craig W

I am trying to determine if two HashSetobjects in .NET 3.5 (C#) are equal sets, i.e.contain the same values. This seems like something one would obviously want to do but none of the provided functions seem to give you this information.

我试图确定HashSet.NET 3.5 (C#) 中的两个对象是否是相等的集合，即包含相同的值。这似乎是人们显然想要做的事情，但提供的功能似乎都没有为您提供此信息。

The way I can think to do this is by checking if the count of the two sets are equal andone set is a subset (not proper) of the other. I think the only way that can happen is if they are equal sets. Example code:

我认为这样做的方法是检查两组的计数是否相等，并且一组是另一个的子集（不正确）。我认为唯一可能发生的方法是它们是否相等。示例代码：

HashSet<int> set1 = new HashSet<int>();
set1.Add(1);
set1.Add(2);
set1.Add(3);

HashSet<int> set2 = new HashSet<int>();
set2.Add(1);
set2.Add(2);
set2.Add(3);

if(set1.Count == set2.Count && set1.IsSubsetOf(set2))
{
    // do something
}

Would this always work? Is there a better way? Why doesn't HashSethave a public bool IsEqualSetWith()function?

这总是有效吗？有没有更好的办法？为什么不HashSet具有 public bool IsEqualSetWith()的功能？

采纳答案by Michael Burr

Look at the method SetEquals.

查看方法SetEquals。

my_hashset.SetEquals(other);

回答by Gregory Adam

IEqualityComparer<HashSet<int>> comp = HashSet<int>.CreateSetComparer();
Console.WriteLine("CreateSetComparer set1 == set2 : {0}", comp.Equals(set1, set2));
// or
bool areEqual = HashSet<int>.CreateSetComparer().Equals(set1, set2);