c# - 将新 child 添加到现有 child

Question

所以我有这种 XML 文件:

<?xml version="1.0" encoding="utf-8"?>
<root>
 <Project1>
 <Students>
   <Student>
     <name>test2</name>
     <studentnum>01</studentnum>
   </Student>
 </Students>
</Project1>
</root>

要将新学生添加到此 XML 文件，我使用此代码 (C#)

XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath("datastorage.xml"));
XmlElement Student = doc.CreateElement("Student");

XmlElement name = doc.CreateElement("name");
XmlText xmlName = doc.CreateTextNode(txtStudentName1.Text);

XmlElement studentnum = doc.CreateElement("studentnum");
XmlText xmlStudentnum = doc.CreateTextNode(txtStudentNum1.Text);

name.AppendChild(xmlName);
studentnum.AppendChild(xmlStudentnum);

Student.AppendChild(name);
Student.AppendChild(studentnum);

doc.DocumentElement.AppendChild(Student);

doc.Save(Server.MapPath("datastorage.xml"));

但问题是，它向 Root 添加了一个新的 Student，而不是 Project1/Students parant。我该怎么做？

我见过 XmlTextWriter 的解决方案，但 4.5 中不再包含该解决方案...

Answer 1

我发现使用 Linq To Xml 更容易

var xDoc = XDocument.Load(filename);
xDoc.Descendants("Project1").Descendants("Students")
    .First()
    .Add(new XElement("Student", 
                new XElement("name","test3"),
                new XElement("studentnum","03")));

xDoc.Save(filename);

输出:

<?xml version="1.0" encoding="utf-8"?>
<root>
  <Project1>
    <Students>
      <Student>
        <name>test2</name>
        <studentnum>01</studentnum>
      </Student>
      <Student>
        <name>test3</name>
        <studentnum>03</studentnum>
      </Student>
    </Students>
  </Project1>
</root>