从变化列表中取值

        List<int> list = new List<int>() {1,2,3,4,5,6,7,8,9,10 };
        int listindex = 0;

        int GetValue()
        {
            if (list.Count > 0)
            {
                if (listindex >= list.Count)
                    listindex = 0;
                listindex = listindex + 1;
                return list[listindex - 1];
            }
            return -1;
        }