Deserializing XML with namespace and multiple nested elements

Question

I am trying to deserialize the following xml

<?xml version="1.0" encoding="utf-8"?>
<ns2:myroot xmlns:ns2="http://jeson.com/">
  <item>
    <name>uno</name>
    <price>1.25</price>
  </item>
  <item>
    <name>dos</name>
    <price>2.30</price>
  </item>
</ns2:myroot>

with these classes

public class item
{
    [XmlElement(Namespace="")]
    public string name { get; set; }

    [XmlElement(Namespace = "")]
    public double price { get; set; }
}

[XmlRoot("myroot", Namespace="http://jeson.com/")]  //This was http://jeson.com, no slash at the end.
public class myrootNS
{
    [XmlElement(Namespace = "")]
    public item[] item { get; set; }
}

using this method

XmlSerializer serializer = new XmlSerializer(typeof(T), "http://jeson.com/");
XmlReaderSettings settings = new XmlReaderSettings();
using (StringReader textReader = new StringReader(xml))
{
    using (XmlReader xmlReader = XmlReader.Create(textReader, settings))
    {
        return (T)serializer.Deserialize(xmlReader);
    }
}

but somehow I keep getting this error.

System.InvalidOperationException: There is an error in XML document (2, 2). ---> 
System.InvalidOperationException: <myroot xmlns='http://jeson.com/'> was not expected.

What is the correct way of doing it ? The method works for deserializing without the namespace.

Turns out my namespace did not have slash at the end. As Alex points out, it should have. — Jeson Martajaya
– Jeson Martajaya, Commented Dec 8, 2014 at 21:26

Esteban Verbel · Accepted Answer · 2019-11-23 00:22:12Z

12

The problem is that the namespace of myrootNS class is incorrect because it doesn't match the expected namespace in the XML.

[XmlRoot("myroot", Namespace = "http://jeson.com/")]
public class myrootNS
{
    [XmlElement(Namespace = "")]
    public item[] item { get; set; }
}

Notice that the Namespace property value has a trailing /. This is my deserialize method:

static T Deserialize<T>(string xml)
{
    XmlSerializer serializer = new XmlSerializer(typeof(T));
    XmlReaderSettings settings = new XmlReaderSettings();
    using (StringReader textReader = new StringReader(xml))
    {
        using (XmlReader xmlReader = XmlReader.Create(textReader, settings))
        {
            return (T)serializer.Deserialize(xmlReader);
        }
    }
}

edited Nov 23, 2019 at 0:22

Esteban Verbel

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answered Dec 8, 2014 at 19:29

Alexander Leyva Caro

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5 Comments

Alexander Leyva Caro Over a year ago

your code is fine, just add the / character at the end on the namespace in your myrootNS class, for that match with your xml expected.

Alexander Leyva Caro Over a year ago

In the XmlSerialezer constructor you don't need to specified the namespace, because you did in your myrootNS class. You can put XmlSerializer serializer = new XmlSerializer(typeof(T));

Jeson Martajaya Over a year ago

Did you try your suggestion? It broke one mine.

Jeson Martajaya Over a year ago

Sure, kindly share please :)

Suncat2000 Over a year ago

If it is specified in the XML file, it shouldn't be needed in the XmlRootAttribute. What is the workaround?

StuartLC · Accepted Answer · 2014-12-09 03:49:59Z

4

As an alternative to the XmlRoot attribute, you can also use the alternative XmlRootAttribute constructor of XmlSerializer to override when the element name or namespace differ:

var serializer = new XmlSerializer(typeof(myrootNS), 
                     new XmlRootAttribute                             
                     { 
                         ElementName = "myroot", 
                         Namespace = "http://jeson.com/" 
                     });

edited Dec 9, 2014 at 3:49

answered Dec 8, 2014 at 19:16

StuartLC

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1 Comment

Jeson Martajaya Over a year ago

Thank you, turns out specifying custom root name in poco is not enough, I have to specify it in the serializer too. Thank you.

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