关于修改此自定义迭代器的问题

我有下面的代码,它基于自定义算法迭代列表:

        public static IEnumerable<TItem>
MakeCustomIterator<TCollection, TCursor, TItem>(
this TCollection collection, // Extension method of the collection used (eg List<T>)
TCursor cursor, // An array of ints which holds our progress
Func<TCollection, TCursor, TItem> getCurrent,
Func<TCursor, bool> isFinished,
Func<TCursor, TCursor> advanceCursor)
        {
            while (!isFinished(cursor)) // While we haven't reached the end of the iteration......
            {
                yield return getCurrent(collection, cursor);
                cursor = advanceCursor(cursor);

            }

        }


     var matrix = new List<List<double>> {
     new List<double> { 1.0, 1.1, 1.2 },
      new List<double> { 2.0, 2.1, 2.2 },
      new List<double> { 3.0, 3.1, 3.2 }
      };

     var iter = matrix.MakeCustomIterator(
     new int[] { 0, 0 },
     (coll, cur) => coll[cur[0]][cur[1]],
     (cur) => cur[0] > 2 || cur[1] > 2,
     (cur) => new int[] { cur[0] + 1,
       cur[1] + 1 });



            foreach (var item in iter)
            {

            }

当我使用这个代码时,它将得到1.0,然后是2.1(在下一个列表中,斜下方)。在第一个链接中是否可以从1.0转到1.1?或者可以从1.0垂直向下移动到2.0?

注意:此代码段来自Accelerated C 2008。

谢谢