Question

I have a XML file like this:

<?xml version='1.0' encoding='utf-8'?>
<sitegroup name = 'healthcare'>
        <site name='A' url='a.aspx'/>
        <site name='B' url='b.aspx'/>
</sitegroup>
<sitegroup name = 'diet'>
        <site name='C' url='c.aspx'/>
    <site name='D' url='d.aspx'/>
</sitegroup>

I am new to C#. I need a simple code to insert a new [site] (entered by user) under a particular [sitegroup] (also choosen by user). if the [sitegroup] supplied by user does not exist in the XML already, the code should create a new [sitegroup] at the end of the XML and then insert the new [site] in it.

Also, could you please let me know how to delete a particular [site] or/and a whole [sitegroup] from the XML?

Thanks a lot in advance.

Answer 1

First of all your xml is invalid. Xml needs to have a root element. Let us asume your root element is sitegroups. Then you can use XLinq api in .NET Framework

class Program
{
    static void Main(string[] args)
    {
        string xml = @"<?xml version='1.0' encoding='utf-8'?>
<sitegroups>
<sitegroup name = 'healthcare'>
        <site name='A' url='a.aspx'/>
        <site name='B' url='b.aspx'/>
</sitegroup>
<sitegroup name = 'diet'>
        <site name='C' url='c.aspx'/>
    <site name='D' url='d.aspx'/>
</sitegroup>
</sitegroups>";

        var doc  = XDocument.Parse(xml);
        XElement siteGroup = doc.Element("sitegroups").Elements().First(e => e.Attribute("name").Value == "healthcare");
        var newSite = new XElement("site", new XAttribute("name", "C"),
                                           new XAttribute("url", "http://www.google.com"));
        siteGroup.Add(newSite);

        Console.WriteLine(doc.ToString());
    }
}