Xml文件操作的其中一个使用方法：

XmlNodeList students = doc.DocumentElement.ChildNodes;//Student节点集合

foreach (XmlNode stu in students)

{

    XmlElement element = (XmlElement)stu;

    string stuId = element.GetAttribute("StuID");

    XmlNode nameNode = element.SelectSingleNode("StuName");//获取Person节点的Name节点

    string name = nameNode.InnerText;

    Console.WriteLine(stuId + "," + name);

}