C＃ - IComparable对象列表之间的交集

Question

如何从两个全部实现IComparable的对象列表中找到相交的对象？

public List<T> Intersect<T>(List<T> list1, List<T> list2) where T : IComparable<T> {
    return ... ;
}

Answer 1

像这样的东西

public List<T> Intersetc<T>(List<T> list1, List<T> list2) where T : IComparable<T>
{
    return list1.Intersect(list2, new MyEqualityComparer<T>()).ToList();
}

public class MyEqualityComparer<T> : IEqualityComparer<T> where T : IComparable<T>
{
    public bool Equals(T t1, T t2)
    {
        return t1.CompareTo(t2) == 0;
    }

    public int GetHashCode(T t)
    {
        return 0;
    }
}

Answer 2

为什么不简单：

    public List<T> Intersect<T>(List<T> list1, List<T> list2) where T : IComparable<T>
    {
        var intersect = list1.Intersect(list2);
        return intersect.ToList();
    }