Question

I am trying to read some data from my XML file

Names/Name/trckid

• 1) For example from an xml file like the one pasted below I want to
  read Names/Name/trckid
  eg :trckid= FF7eb01f7-7985-47b1-8f8c-a0e92395d00f

• 2) as well as Names/Name/Files/file/uri where formatCode=”2001″
  eg resulting string: uri=http://cont.catalog.address.xyz.com/e2/ds/9b660964.jpg

Here is my sample XML file

<?xml version="1.0" encoding="utf-8"?>
<Names tracking="trckids" execTime="0" xmlns="urn:schemas-microsoft-com:address:catalog">
    <Name xmlns="urn:schemas-microsoft-com:address:catalog" publishState="Published" lcid="1033" options="0" version="65" filterFlags="32687">
        <trckid ref="5ofol35" seoMetaData="/xyz/gpscatalog/">FF7eb01f7-7985-47b1-8f8c-a0e92395d00f</trckid>
        <providerId>Test0_2286326_304163829</providerId>
        <files>
            <file formatCode="2001" gpsFileId="9B660964-1626-466C-8359-F036506D8769" height="102" width="136" fileHash="4a4bcceb08b4ccdd16a958e8687c9588">
                <uri>http://cont.catalog.address.xyz.com/e2/ds/9b660964-1626-466c-8359-f036506d8769.jpg</uri>
            </file>
            <file formatCode="2007">
                <uri>http://img1.catalog.address.xyz.com/image.aspx?uuid=d7eb01f7-7985-47b1-8f8c-a0e92395d00f&amp;w=136&amp;h=102</uri>
            </file>
            <file formatCode="2200" gpsFileId="6C34F723-D798-4DA8-AEE4-0442C239D3A0" fileSize="311469" height="180" width="320"                                                                             sourceFileHash="6ea74770f622e3e0dc9cf5e229c7de7f">
                <uri>http://cont.catalog.address.xyz.com/e2/ds/0909a015-4b6a-4574-be63-c2facd527b9f_0.xml</uri>
            </file>
        </files>
    </Name>
   <Name xmlns="urn:schemas-microsoft-com:address:catalog" publishState="Published" lcid="1033" options="0" version="65" filterFlags="32687">
        <trckid ref="5ofol20" seoMetaData="/xyz/gpscatalog/">FF9eb01f7-7985-47b1-8f8c-a0e92395d00f</trckid>
        <providerId>Test1TheLorax_2286326_304163829</providerId>
        <files>
            <file formatCode="2001" gpsFileId="9B660964-1626-466C-8359-F036506D8769" height="102" width="136" fileHash="4a4bcceb08b4ccdd16a958e8687c9588">
                <uri>http://cont.catalog.address.xyz.com/e2/ds/9b660964-1626-466c-8359-f036506d8769.jpg</uri>
            </file>
            <file formatCode="2007">
                <uri>http://img1.catalog.address.xyz.com/image.aspx?uuid=d7eb01f7-7985-47b1-8f8c-a0e92395d00f&amp;w=136&amp;h=102</uri>
            </file>
            <file formatCode="2200" gpsFileId="6C34F723-D798-4DA8-AEE4-0442C239D3A0" fileSize="311469" height="180" width="320"                                                                             sourceFileHash="6ea74770f622e3e0dc9cf5e229c7de7f">
                <uri>http://cont.catalog.address.xyz.com/e2/ds/0909a015-4b6a-4574-be63-c2facd527b9f_0.xml</uri>
            </file>
        </files>
    </Name>
</Names>

I tried with the below given piece of code

      XDocument xdoc = XDocument.Parse(xmlstring);
            XNamespace ns = xdoc.Root.GetDefaultNamespace();  // "urn:schemas-microsoft-com:msnvideo:catalog";
            IEnumerable<XElement> names = xdoc.Descendants(ns + "name");
   foreach (XElement name in names)
            {


                 rssFeedItems.Add(new Adressses
                    {
                    trackid=  Convert.ToString(name.Element(ns + "trackid").Value),
                    providerID= Convert.ToString(name.Element(ns + "provideid").Value),

                    imageUri = Convert.ToString(name.Element(ns + "uri").Value)
                    });

            }        
  Here  am able to read first two items ,ie, trackid and providerID ,but not the image uri

I need to read the uri that matches Names/Name/files/file@formatcode[2001]/uri

something like

 imageUri = Convert.ToString(name.Element(ns + "Names/Name/files/file@formatcode[2001]/uri").Value)

but this just doesn’t work . please help

Answer 1

First thing, your xml is invalid. The end tag should look like this </Names> instead of <Names/>

Secondly, you’ve got to add the namespace declaration. Like this:

    XNamespace cat = "urn:schemas-microsoft-com:address:catalog";
    XNamespace add = "urn:schemas-microsoft-com:msnvideo:address";
    XDocument doc = XDocument.Parse(xdata);
    var firstTrck = doc.Element(cat + "Names").Elements(add + "Name").First().Element(add + "trckid");
    var val = firstTrck.Value;

Also of note, careful with how you append (s) on Element/Elements to make sure you are looking for one or many elements.

Here’s how to iterate over your element collections:

        XNamespace cat = "urn:schemas-microsoft-com:address:catalog";
        XNamespace add = "urn:schemas-microsoft-com:msnvideo:address";
        XDocument doc = XDocument.Parse(xdata);

        var xNames = doc.Element(cat + "Names").Elements(add + "Name");
        foreach (var xName in xNames)
        {
            var trackingId = xName.Element(add + "trckid").Value;

            var xFiles = xName.Element(add + "files").Elements(add + "file").Where(xe => (string)xe.Attribute("formatCode") == "2001");
            foreach (var xFile in xFiles)
            {
                var uri = xFile.Element(add + "uri").Value;
            }
        }

Notice when you debug this that only one of the “Name” elements appears in the collection. This is because the xmlns declaration doesn’t match for each.