How do I add a default namespace with no prefix using XMLSerializer

Question

I am trying to generate an XML document that contains the default namespace without a prefix using XmlSerializer, e.g.

<?xml version="1.0" encoding="utf-8" ?>
<MyRecord ID="9266" xmlns="http://www.website.com/MyRecord">
    <List>
        <SpecificItem>

Using the following code ...

string xmlizedString = null;
MemoryStream memoryStream = new MemoryStream();
XmlSerializer xs = new XmlSerializer(typeof(ExportMyRecord));
XmlSerializerNamespaces xmlnsEmpty = new XmlSerializerNamespaces();
xmlnsEmpty.Add(string.Empty, string.Empty);
XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8);
xs.Serialize(xmlTextWriter, myRecord, xmlnsEmpty);
memoryStream = (MemoryStream)xmlTextWriter.BaseStream;
xmlizedString = this.UTF8ByteArrayToString(memoryStream.ToArray());

and class structure ...

[Serializable]
[XmlRoot("MyRecord")]
public class ExportMyRecord
{
    [XmlAttribute("ID")]
    public int ID { get; set; }

Now, I've tried various options ...

XmlSerializer xs = new XmlSerializer
                     (typeof(ExportMyRecord),"http://www.website.com/MyRecord");

or ...

[XmlRoot(Namespace = "http://www.website.com/MyRecord", ElementName="MyRecord")]

gives me ...

<?xml version="1.0" encoding="utf-8"?>
<q1:MylRecord ID="9266" xmlns:q1="http://www.website.com/MyRecord">
    <q1:List>
        <q1:SpecificItem>

I need the XML to have the namespace without the prefix as it's going to a third party provider and they reject all other alternatives.

Darin Dimitrov · Accepted Answer · 2010-03-26 09:09:08Z

41

There you go:

ExportMyRecord instance = GetInstanceToSerializeFromSomewhere();
XmlSerializerNamespaces xmlnsEmpty = new XmlSerializerNamespaces();
xmlnsEmpty.Add(string.Empty, "http://www.website.com/MyRecord");
var serializer = new XmlSerializer(
    instance.GetType(), 
    "http://www.website.com/MyRecord"
);

answered Mar 26, 2010 at 9:09

Darin Dimitrov

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3 Comments

arviman Over a year ago

just wanted to note that you're not using xmlnsEmpty and can be omitted. The overload of serialize that takes XmlSerializerNamespaces doesn't seem to use the string.empty value.

Eon Over a year ago

Brilliant! was also having issues with <q1:root xmlns:SomeAttr="urn" q1:SomeAttr="urn> till I saw this fix. just had to add an additional XmlSerializerNamespace for my solution to work

Jamie Ide Over a year ago

xmlnsEmpty is used during serialization: serializer.Serialize(xmlTextWriter, myRecord, xmlnsEmpty);

Sven Vranckx · Accepted Answer · 2019-02-02 10:56:53Z

2

Here's a generic implementation that can be used for any type:

public static void Serialize<T>(T instance, string defaultNamespace, Stream stream)
{
    var namespaces = new XmlSerializerNamespaces();
    namespaces.Add(string.Empty, defaultNamespace);
    var serializer = new XmlSerializer(typeof(T), defaultNamespace);
    serializer.Serialize(stream, instance, namespaces);
}

edited Feb 2, 2019 at 10:56

answered Jan 31, 2019 at 15:01

Sven Vranckx

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