SelectSingleNode is returning null

Question

Please review xml kml file attachment below for details.

SelectSingleNode is returning null from the path below. Review xml kml file to see what I am doing wrong below.

XmlNode n = kmlDoc.DocumentElement.SelectSingleNode("/kml/Document/Placemark/MultiGeometry/Polygon/outerBoundaryIs/LinearRing/coordinates");

Attachment: volume.zip

Midhun Tp · Answer

Hi, I think the issue is with the xmlns namespace in your kml file. Remove that & check. It is working fine when I checked. xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom"> In your kml file, remove the portion marked in red from kml node.

David Smith · Answer

Ok. I need help with more thing. Basically the volume file that you reviewed, I am loading into an xml document and then replacing the innertext of the node and then resaving file as a kml. If I want to add more polygons along with coordinates in the file dynamically how would I do that with the same structure dynamically. This is what I am doing below for with a the preexisting volume.kml //kmlDoc.Load(@"C:	emp\KML\volume2.kml"); var xmlNode = kmlDoc.SelectSingleNode("kml/Document/Placemark/MultiGeometry/Polygon/outerBoundaryIs/LinearRing/coordinates"); if (xmlNode != null) { xmlNode.InnerText = KmlObjectString.ToString(); string[] nameArray = browseFile.SafeFileName.Split('.'); kmlDoc.Save(@"C:	emp\KML" + nameArray[0] + ".kml"); }

Midhun Tp · Answer

Hi, Happy to see it's working. Talking about the issue, I am also working with kml file for the first time. So not an expert to talk about the issue. Just found out below 2 links and tried my luck- https://msdn.microsoft.com/en-us/library/d271ytdx.aspx http://stackoverflow.com/questions/4171451/xmldocument-selectsinglenode-and-xmlnamespace-issue As per my understanding, xmlns is the dafault namespace of xml files. Hence if we use it in our file, we may need to use a XmlNamespaceManager as specified in the second link. The second option is to remove the default namespace. So i tried the second one, which was comparatively easier :)

David Smith · Answer

Thanks its working now. Can you tell me why was that the issue. I am new to kml

SelectSingleNode is returning null

Answers (4)