//這是一個符合xml格式的字串
            string xml = "<xmn> <people><name>zs</name><age>22</age></people> <people><name>ls</name><age>23</age></people> </xmn>";

            //將string 轉化為 XmlDocument物件的xml格式
            XmlDocument xmlDoc =
 
 new XmlDocument();
            xmlDoc.LoadXml(xml);

            //查詢單節點SelectSingleNode,如果存在多個相同節點，預設查詢第一個
            XmlNode nameNode = xmlDoc.SelectSingleNode("//name");   
            string name = nameNode.InnerText;   //zs

            //查詢所有節點
            XmlNodeList nameNodeList = xmlDoc.SelectNodes("//people"
 
);

            //遍歷取值
            foreach (XmlNode nameInfo in nameNodeList)
            {
                string nameValue = (nameInfo.SelectSingleNode("//name")).InnerText;
            }