C# 如何在特定的xml节点中选择子节点？

我想删除选定的行并更新xml文件，然后用更新的数据加载网格视图。调试时，我得到nodelist的null值

这是我的xml文件

<?xml version="1.0" encoding="utf-8" ?>
<PERSONES>
  <person>
    <name>Dilan Perera</name>
    <age>22</age>
  </person>
  <person>
    <name>Thusitha Badde</name>
    <age>24</age>

  </person>
</PERSONES>

---

xpath查询不正确，@means属性，因此在年龄检查中删除@，然后它将过滤元素

   protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
   {      
       GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
       string age = row.Cells[2].Text.Trim(); // i get correct value for age here

       XmlDocument doc2 = new XmlDocument();
       doc2.Load(Server.MapPath("names.xml")); 
       XmlNode nodeList = doc2.SelectSingleNode(string.Format("PERSONES/person[age='{0}']", age));

       doc2.DocumentElement.RemoveChild(nodeList);
       doc2.Save(Server.MapPath("names.xml"));

       getdata();   
   }

我刚刚测试了这个，它是有效的

XmlDocument doc2 = new XmlDocument();
doc2.Load(Server.MapPath("names.xml")); 
XmlNode ageNode = doc2.SelectSingleNode(string.Format("//PERSONES/person/age[text() = '{0}']", age));
if (ageNode != null)
{
    var personNode = ageNode.ParentNode;

    doc2.DocumentElement.RemoveChild(personNode);
    doc2.Save(Server.MapPath("names.xml"));

}

XmlDocument doc2 = new XmlDocument();
doc2.Load(Server.MapPath("names.xml")); 
XmlNode ageNode = doc2.SelectSingleNode(string.Format("//PERSONES/person/age[text() = '{0}']", age));
if (ageNode != null)
{
    var personNode = ageNode.ParentNode;

    doc2.DocumentElement.RemoveChild(personNode);
    doc2.Save(Server.MapPath("names.xml"));

}