Question

I have a data set that I receive from a service. The data comes in XML format. We are given an XElement object with all the data. The structure of the XML document is very simple. Looks like this:

<root> 
 <dataPoint>
   <id>1</id>
   <param1>somedata</param1>
   <param2>somedata</param2>
 </dataPoint>
 <dataPoint>
   <id>2</id>
   <param1>somedata</param1>
   <param2>somedata</param2>
 </dataPoint>
</root>

Of course, I have a large number of dataPoints. I also have a list (List) with the id’s of dataPoints being displayed in a GUI. What I’d like to have is the dataPoints that ARE NOT displayed on the GUI so I can manipulate only those and not the whole data set.
Thanks

Answer 1

var toDisplay = new List<string>() { "2" };

var xDoc = XElement.Load(.....);
var dPoints = xDoc.Descendants("dataPoint")
                    .Where(d => !toDisplay.Contains(d.Element("id").Value));
var newXml = new XElement("root",dPoints).ToString();