1.选取某个节点

方法一：newNode = document.DocumentElement.SelectSingleNode("//student[@id='A103']");

方法二：newNode = document.DocumentElement.SelectSingleNode("/studentlist/student");

 

2.选取同名的节点

方法一：XmlNodeList nodeList = document.DocumentElement.GetElementsByTagName("student");

方法二：XmlNodeList nodeList = document.DocumentElement.SelectNodes("/studentlist/student");

方法三：XmlNodeList nodeList = document.SelectNodes("/studentlist/student");