XmlReader - I need to edit an element and produce a new one

Question

I am overriding a method which has an XmlReader being passed in, I need to find a specific element, add an attribute and then either create a new XmlReader or just replace t

Answer 1

I would rather prefer to load the xml into XmlDocument object and use Attributes collection to modify the value and call Save method to update this value. Below code works for me.

 public static void WriteElementValue ( string sName, string element, string value)
 {
  try
  {
    var node = String.Format("//elements/element[@name='{0}']", sName);
    var doc = new XmlDocument { PreserveWhitespace = true };
    doc.Load(configurationFileName);

    var nodeObject = doc.SelectSingleNode(node);

     if (nodeObject == null)
         throw new XmlException(String.Format("{0} path does not found any matching 
         node", node));

    var elementObject = nodeObject[element];

    if (elementObject != null)
    {
       elementObject.Attributes["value"].Value = value;
    }

    doc.Save(configurationFileName);
}
catch (Exception ex)
{
   throw new ExitLevelException(ex, false);
}

}

I've also observed when you use XmlWriter or XmlSerializer the whitespaces were not correctly preserved, this could be annoying sometimes