如何将XPathNavigator对象的集合转换为XPathNodeIterator

Question

如何将XPathNavigator个对象的集合转换为XPathNodeIterator个对象的集合？

以下是示例代码：

public XPathNodeIterator RandomizeXPathNodeIterator(XPathNodeIterator iterator)
{
    List<XPathNavigator> list = new List<XPathNavigator>();
    //Populate list with XPathNavigator's

    //How do i return XPathNodeIterator
}