如何从像List<Tuple<int，int>>这样的元组列表中提取item2(值)列表？

List<Tuple<int, int>> tupleList = new List<Tuple<int, int>>();
tupleList.Add(new Tuple<int, int>(1, 10));
tupleList.Add(new Tuple<int, int>(2, 20));
tupleList.Add(new Tuple<int, int>(3, 30));

List<int> item2List = new List<int>();
foreach (var tuple in tupleList)
{
    item2List.Add(tuple.Item2);
}

// item2List 现在包含了元组列表中所有的item2值