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Asked: 2026-06-17T05:03:06+00:00

I have an XML file (from somewhere) containing matrix values, which I wish to

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I have an XML file (from somewhere) containing matrix values, which I wish to get into my code as double[][] objects. The XML contains table nodes, which look like standard serialized double[][] objects: 

<table type="System.Double[][]"><table type="System.Double[]"><el type="System.Double">0.005</el><el type="System.Double">0.001</el><el type="System.Double">0.007</el><el type="System.Double">-0.012</el></table><table type="System.Double[]"><el type="System.Double">0.033</el><el type="System.Double">-0.146</el><el type="System.Double">-0.008</el><el type="System.Double">0.006</el></table><table type="System.Double[]"><el type="System.Double">-0.002</el><el type="System.Double">-0.004</el><el type="System.Double">-0.004</el><el type="System.Double">-0.003</el></table><table type="System.Double[]"><el type="System.Double">0</el><el type="System.Double">0</el><el type="System.Double">0</el><el type="System.Double">0</el></table></table>

Since not the whole XML is in this form, I only extract those nodes as XmlNode (since XElements don’t have InnerXml). Lets call this myMatrixXmlNode.
Then, I try to put that into a MemoryStream, and then deserialize from that:

var deserializer = new XmlSerializer(typeof(double[][]));
var myMatrix = (double[][])deserializer.Deserialize(new MemoryStream(Encoding.UTF8.GetBytes(myMatrixXmlNode.InnerXml)));

This throws me a <table xmlns=''> was not expected. error, for which I have not found a solution yet.. and I’m geting really annoyed by this.

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1 Answer

  1. Editorial Team

    You can not use standart Xml serializer for deserializing this Xml into double[][].

    Format for double[][] Xml serialization is like:

    <ArrayOfArrayOfDouble xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'     xmlns:xsd='http://www.w3.org/2001/XMLSchema'>
  <ArrayOfDouble>
    <double>1</double>
  </ArrayOfDouble>
  <ArrayOfDouble>
    <double>2</double>
  </ArrayOfDouble>
</ArrayOfArrayOfDouble>

    You can try parse thos Xml manually using LinqToXml or transforming it to corresponding format.

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