Cloning xml nodes into a new xmldoc

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  10 years ago

  by runningmaster

  John Jones

  London, United Kingdom

  Joined 10 years ago

  Hi,

  I am trying to clone a set of nodes from one xmldocument to another as below:

  my source document looks like this....

  <gpx
    version="1.0"
    creator="Someone"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.topografix.com/GPX/1/0"
    xsi:schemaLocation="http://www.topografix.com/GPX/1/0 http://www.topografix.com/GPX/1/0/gpx.xsd">
      <trk>
          <name></name>
          <time></time>
          <trkseg>
              <trkpt lat="" lon="">
                  <ele></ele>
                  <time></time>
              </trkpt>
          </trkseg>
          <trkseg>
              <trkpt lat="" lon="">
                  <ele></ele>
                  <time></time>
              </trkpt>
          </trkseg>
          <trkseg>
              <trkpt lat="" lon="">
                  <ele></ele>
                  <time></time>
              </trkpt>
          </trkseg>
      </trk>
  </gpx>
  

  I have a destination document template created which will have a load more stuff in but a similar structure as follows:

  What I want to do is clone all the nodes and included data and copy them to the new file in between the tags.

  However, somethings not right with my c# code as follows as I only get null back when the xpath parses. If I do * then that works but I don't want everything, I only want the trkseg's back. I'd have assumed that the xpath below would have worked fine.

          gpxDoc.Load(MapPath("~/datafiles/" + idOfEntry.ToString() + ".xml"));
  
          //Copy the trkseg nodes and data from the original to the new file
  
          XmlNode objToBeCloned;
          XmlElement root = gpxDoc.DocumentElement; // original file
  
  
          //Create and instance of the new file
          XmlDocument newGpxDoc = new XmlDocument();
  
          XmlElement root2 = newGpxDoc.DocumentElement; //new file
  
          //This document is a template which doesnt have any <trkseg> nodes
  
          newGpxDoc.Load(MapPath("~/defaultGCDataFile.xml"));
  
          //This should have all the trkseg's in from the original file
          objToBeCloned = root.SelectSingleNode(@"/trk/trkseg"); 
          XmlNode objNewNode = objToBeCloned.CloneNode(true);
  
          //Insert the nodes after the trk tag in the new file
  
          root2.InsertAfter(objNewNode, newGpxDoc.LastChild);
  

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