Question

I’m attempting to develop a Windows 7 Phone and I am using an XML file that I need to parse and then perform a Linq query on.

The problem is this:

Whenever I try to access the file (it is stored locally) it brings back an error saying the file cannot be found as it’s not part of the XAP package.

I have tried another solution where I use StreamReader But I am still getting a simular error:

Attempt to access the method failed System.IO.File.OpenText(System.String)

Here is the code that I am using:

using (StreamReader reader = File.OpenText("C:/Users/Desktop/Assign/obj/Debug/buildings.kml"))
        {
            var xdoc = XDocument.Load ("buildings.kml");
            XNamespace kml = "http://www.opengis.net/kml/2.2";

            var dict = xdoc.Descendants(kml + "Placemark")
                          .ToDictionary(d => d.Element(kml + "name").Value,
                          d => d.Element(kml + "id").Value);

            foreach (var b in dict) {
                Console.WriteLine ("Building Name -> " + b.Key + " Building ID -> " + b.Value);
            }
        }

The file is located in: > C:/Users/Desktop/Assign/obj/Debug/buildings.kml so I cannot see the problem. Outside of Visual Studio, I can read in the .xml file fine.

Hope someone can help

EDIT:

New code –

Dictionary<string, string> getBuildingNames()
    {
        Uri uri = new Uri(@"Data\mydata.kml", UriKind.Relative);

        StreamResourceInfo sri = Application.GetResourceStream(uri);

        StreamReader sr = new StreamReader(sri.Stream);

        var xdoc = XDocument.Load(sr);
        XNamespace kml = "http://www.opengis.net/kml/2.2";

        var dict = xdoc.Descendants(kml + "Placemark")
                      .ToDictionary(d => d.Element(kml + "name").Value,
                      d => d.Element(kml + "id").Value);


        return dict;


    }

Error: – ‘NullReferenceException was unhanded’

Answer 1

Assuming you really are trying to do this as part of a WP7 project (rather than some non-mobile project related to it, e.g. preprocessing) you shouldn’t be using File.OpenText.

Options:

• Include the XML in your XAP file, and read from that using Application.GetResourceStream (see this blog post for details)
• Somehow get the XML into isolated storage, and use the isolated storage API
• Embed the resource into your assembly, and use Assembly.GetManifestResourceStream.