我有一个字典＆LT; INT，列表和LT;字符串＆GT;＆GT; ，我想相交所有列表的每个INT

I have a dictionary<int, List<string>> and I want to intersect all of the lists for each int.

我将如何做到这一点？我觉得这应该是容易的，但由于某种原因它不工作了。

How would I achieve that? I feel like this should be easy, but for some reason it's not working out.

感谢。

推荐答案

这是很容易来循环列表的顺序，把第一次到的HashSet ，然后相互交叉子列表吧：

It's easy enough to iterate the sequence of lists, putting the first into a HashSet and then intersecting each subsequence list with it:

public static IEnumerable<T> intersectAll<T>(IEnumerable<IEnumerable<T>> source)
{
    using (var iterator = source.GetEnumerator())
    {
        if (!iterator.MoveNext())
            return Enumerable.Empty<T>();

        var set = new HashSet<T>(iterator.Current);
        while (iterator.MoveNext())
            set.IntersectWith(iterator.Current);

        return set;
    }
}

使用这个你可以写 IntersectAll（dictionary.Values​​.Cast＆LT; IEnumerable的＆LT;字符串＆GT;＆GT;（））。获取路口