Write an xml node in a specific position

hellamasta

Hi everybody, i'd like to know ('cause I'm on my first experience with c#) if it is possible with xmltextwriter, to write a new node in a specified position. Thank you

Heath Stewart

Not with an XmlTextWriter, no. That is used to merely write out XML forward-only, appending elements, fragments, etc. all moving forward. If you want to open an existing XML document and add an element in a certain position use the XmlDocument to load the XML and use one of the XPath methods like SelectSingleNode to find the node you want, then either prepend or append the node you want to add like so:

class Program
{
    static void Main(string\[\] args)
    {
        string xml = @"<?xml version=""1.0""?>

<root>
<child id=""one"">
<grandchild id=""a""/>
<grandchild id=""b""/>
</child>
<child id=""two"">
<grandchild id=""c""/>
<grandchild id=""d""/>
</child>
</root>";
XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);

XmlNode node = doc.DocumentElement.SelectSingleNode(@"child[@id=""two""]");
if (node != null)
{
XmlElement elem = doc.CreateElement("grandchild");
elem.Attributes.Append(doc.CreateAttribute("id"));
elem.Attributes[0].Value = "e";
node.AppendChild(elem);
}

using (XmlTextWriter writer = new XmlTextWriter(Console.Out))
{
writer.Formatting = Formatting.Indented;
doc.WriteTo(writer);
}
}
}

This posting is provided "AS IS" with no warranties, and confers no rights. Software Design Engineer Developer Division Customer Product-lifecycle Experience Microsoft [My Articles] [My Blog]

hellamasta

Thank you so much...in fact I was reading msdn documentation for xmlDataDocument...now I'll go trying...thanks agains

hellamasta

well, now...i have the following structure of my xml file: - Now a I want to add dynamically new nodes under Variables, Parameters and BreakPoints, and for each subnode I have many properties to store, any suggestion?

hellamasta

Heath Stewart

You need to change < to < and > to >, or check "Ignore HTML tags in this message" when posting SGML-derivative code like HTML and XML. This posting is provided "AS IS" with no warranties, and confers no rights. Software Design Engineer Developer Division Customer Product-lifecycle Experience Microsoft [My Articles] [My Blog]

Heath Stewart

Be aware that the XmlDataDocument is really designed for a DataSet or similar schema. If you're XML fragment is more complex you should stick with XmlDocument. This posting is provided "AS IS" with no warranties, and confers no rights. Software Design Engineer Developer Division Customer Product-lifecycle Experience Microsoft [My Articles] [My Blog]