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Editorial Team
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Asked: 2026-05-31T19:55:38+00:00

I posted a different flavour of this problem before with no joy. I’m hoping

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I posted a different flavour of this problem before with no joy. I’m hoping a refactored question will help.

Essentially, i’m loading an XML string into an XDocument then using XDocument.GetReader() to return a XmlReader. From here I’m using a XmlSerializer to deserialise the following XML:

<?xml version='1.0' encoding='UTF-8'?>
<osgb:FeatureCollection
xmlns:osgb='http://www.ordnancesurvey.co.uk/xml/namespaces/osgb'
xmlns:gml='http://www.opengis.net/gml'
xmlns:xlink='http://www.w3.org/1999/xlink'
xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
xsi:schemaLocation='http://www.ordnancesurvey.co.uk/xml/namespaces/osgb http://www.ordnancesurvey.co.uk/xml/schema/v7/OSDNFFeatures.xsd'
fid='GDS-58116-1'>
  <gml:description>OS</gml:description>
  <gml:boundedBy>
    <gml:null>unknown</gml:null>
  </gml:boundedBy>
  <osgb:queryTime>2009-07-30T02:35:17</osgb:queryTime>
  <osgb:queryExtent>
    <osgb:Rectangle srsName='osgb:BNG'>
      <gml:coordinates>291000.000,92000.000 293000.000,94000.000</gml:coordinates>
    </osgb:Rectangle>
  </osgb:queryExtent>  
</osgb:FeatureCollection>

to this class (generated using XSD)

[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "4.0.30319.1")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(Namespace = "http://www.ordnancesurvey.co.uk/xml/namespaces/osgb")]
[System.Xml.Serialization.XmlRootAttribute("FeatureCollection", Namespace = "http://www.ordnancesurvey.co.uk/xml/namespaces/osgb", IsNullable = false)]
public partial class FeatureCollectionType : AbstractFeatureCollectionType
{

    private System.DateTime queryTimeField;

    private GeometryPropertyType queryExtentField;

    private System.DateTime queryChangeSinceDateField;

    private bool queryChangeSinceDateFieldSpecified;

    private FeatureAssociationType[] _featureMemberField;

    private BoundingShapeType boundedBy1Field;

    //  more properties

}

The inner exception shows that: <FeatureCollection xmlns='http://www.ordnancesurvey.co.uk/xml/namespaces/osgb'> was not expected.

I can’t see what the problem it. I don’t need a root node above the collection do I?

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1 Answer

  1. Editorial Team

    I have tested a simplified version (with all properties removed from FeatureCollectionType), and it didn’t throw at the first element:

    private static string xml = 
@"<?xml version='1.0' encoding='UTF-8'?>
<osgb:FeatureCollection
   xmlns:osgb='http://www.ordnancesurvey.co.uk/xml/namespaces/osgb'
   xmlns:gml='http://www.opengis.net/gml'
   xmlns:xlink='http://www.w3.org/1999/xlink'
   xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
   xsi:schemaLocation='http://www.ordnancesurvey.co.uk/xml/namespaces/osgb http://www.ordnancesurvey.co.uk/xml/schema/v7/OSDNFFeatures.xsd'
   fid='GDS-58116-1'>
</osgb:FeatureCollection>";

public static void RunSnippet()
{
    using (var sr = new StringReader(xml))
    {
        var xs = new XmlSerializer(typeof(FeatureCollectionType));
        var obj = xs.Deserialize(sr);
        Console.WriteLine("if you are reading this, it didn't throw");
    }
}

    How are you instantiating XmlSerializer?

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