Extract data from xml in c# getting NullReference

Question

I am currently making my first steps in extracting data from an XML i get, where the following link provides the response I get: http://maps.google.com/maps/api/geocode/xml?address=AT,%20Wien

Now I try to get the latitude and logitude of the first element:

 string serviceUri = string.Format("http://maps.google.com/maps/api/geocode/xml?address=AT,", location);
        XmlDocument doc = new XmlDocument();
        XDocument X = XDocument.Load(serviceUri);

        var position = X.Element("GeoCodeResponse").Element("result");
        var position1= position.Element("geometry").Element("location");
        string latitude = position1.Element("lat").Value;
        string longitude = position1.Element("lng").Value;

But it seems I missunderstood something from that question which was also answered here: C# extracting data from XML

Please help me understand it a little bit further, br

possible duplicate of What is a NullReferenceException and how do I fix it? — user57508
– user57508, Commented Jun 17, 2015 at 22:18

Umair M · Accepted Answer · 2015-06-18 05:53:44Z

1

Try using

var position = X.Root.Element("result");

if you debug your code in visual studio you will see that X.Element("GeoCodeResponse") returns null. And you are trying to use X.Element("") on null. You can also check null before accessing your root node.

edited Jun 18, 2015 at 5:53

answered Jun 17, 2015 at 22:38

Umair M

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1 Comment

Nathan Tuggy Over a year ago

Could you please edit in an explanation of why this code answers the question? Code-only answers are discouraged, because they don't teach the solution. (This post was flagged by at least one user, presumably because they thought an answer without explanation should be deleted.)

Uwe Schmidt · Accepted Answer · 2015-06-17 22:49:39Z

1

The solution is simple.

If you're splitting the statements like

var root = X.Element("GeoCodeResponse");
var position = root.Element("result");

You will see, that the NPE is thrown by

var position = root.Element("result");

If you're looking in debugmode what 'root' contains. You will see, that 'root' is 'null'. So there is no element 'GeoCodeResponse'. It should be namend like 'GeocodeResponse' and you're solution works.

edited Jun 17, 2015 at 22:49

answered Jun 17, 2015 at 22:43

Uwe Schmidt

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