xmlnode insertafter secondchild...or third?

Question

I know this may seem like a silly question and I have attempted to check msdn documentation and also search this site for some time. I have unfortunately not been able to really understand how to do it.

I would like to insert a node after a second or third child. My XML's main content lies within its grandchildren and when I use root.insertafter I get it put right after very first child.

XML:

<myCourse>
  <courseName>BEng Mobile and Web Computing</courseName>
  <courseStructure>
    <module>
      <moduleTitle>Programming Methodology</moduleTitle>
      <credits>15</credits>
      <semester>1</semester>
    </module>
    <module>
      <moduleTitle>Computer Systems Fundamentals</moduleTitle>
      <credits>15</credits>
      <semester>1</semester>
    </module>
  </courseStructure>
</myCourse>

And Code:

    private void buttonCreateNode_Click(object sender, EventArgs e)
    {
        // Load the XML document.
        XmlDocument document = new XmlDocument();
        document.Load(@"temp.xml");

        // Get the root element.
        XmlElement root = document.DocumentElement;

        // Create the new nodes.
            XmlElement newModule = document.CreateElement("module");
            XmlElement newTitle = document.CreateElement("moduleTitle");
            XmlElement newCredits = document.CreateElement("credits");
            XmlElement newSemester = document.CreateElement("semester");
            XmlText title = document.CreateTextNode("ECA411");
            XmlText credits = document.CreateTextNode("15");
            XmlText semester = document.CreateTextNode("1");

            // Insert the elements.
            newBook.AppendChild(newTitle);
            newBook.AppendChild(newCredits);
            newBook.AppendChild(newSemester);
            newTitle.AppendChild(title);
            newCredits.AppendChild(credits);
            newSemester.AppendChild(semester);
            root.InsertAfter(newModule, root.LastChild);

        document.Save(@"temp.xml");

Any help would be greatly appreciated.

score 3 · Accepted Answer · answered May 11 '12 at 07:13

Thanks for your help @Mikkelbu.

I have however found a solution to my problem in where to I am now able to accomplish what I was attempting to achieve.

As follows:

XmlNode parentNode = document.SelectSingleNode("myCourse/courseStructure/level4");
            parentNode.InsertBefore(newModule, parentNode.FirstChild);

score 0 · Answer 2 · answered May 08 '12 at 12:26

If I understand your problem correct then you want to insert the new module after the module with the title Computer Systems Fundamentals. If so then the you need to change the root of the insertion. So you can change the line

XmlElement root = document.DocumentElement;

to

XmlNode root = document.DocumentElement.LastChild;

I would also change the variable name root to for instance courseStructureNode and the correct the comment accordingly.

Ps. To compile the code you will also need to change newBook to newModule.

xmlnode insertafter secondchild...or third?

2 Answers2