Remove empty xmlns=“” after Xml Serialization

Question

So I am still asking questions about this topic :-(

So I create an object, decorate it with the Xml Serialization Attributes, from what I have seen I add an empty na

Answer 1

This works (you just need them to be in the same namespace and you use the namespaces class so the writter doesn't confuse):

[TestMethod]
public void TestMethod3()
{
    var list = new []{new SitemapNode("1", DateTime.Now, 1), new SitemapNode("2", DateTime.Now.AddDays(1), 2)};
    var serializer = new XmlSerializer(typeof(SitemapNode));
    var st = new MemoryStream();
    using (var writer = XmlWriter.Create(st))
    {
        var ns = new XmlSerializerNamespaces();
        ns.Add("", "test");
        writer.WriteStartElement("test", "test");
        foreach (SitemapNode node in list)
        {
            serializer.Serialize(writer, node, ns);
        }
        writer.WriteEndElement();
    }
    st.Position = 0;
    TestContext.WriteLine(new StreamReader(st).ReadToEnd());
}


[XmlRoot(ElementName = "url", Namespace = "test")]
public class SitemapNode
{
    [XmlElement(ElementName = "loc")]
    public string Location { get; set; }
    [XmlElement(ElementName = "lastmod")]
    public DateTime LastModified { get; set; }
    [XmlElement(ElementName = "priority")]
    public decimal Priority { get; set; }

    public SitemapNode()
    {
        Location = String.Empty;
        LastModified = DateTime.Now;
        Priority = 0.5M;
    }

    public SitemapNode(string location, DateTime lastModified, decimal priority)
    {
        Location = location;
        LastModified = lastModified;
        Priority = priority;
    }
}

And the output is (based on your comments that is what you were looking for):

    <?xml version="1.0" encoding="utf-8"?><test xmlns="test">
<url><loc>1</loc><lastmod>2009-03-05T13:35:54.6468-07:00</lastmod><priority>1</priority></url>
<url><loc>2</loc><lastmod>2009-03-06T13:35:54.6478-07:00</lastmod><priority>2</priority></url></test>

Answer 2

I was having trouble inserting a node into an existing document with multiple namespaces.

No matter what I set the namespace to it would add the xmlns reference attribute every time no matter what. This was breaking something black boxed downstream.

I eventually got around this by doing something like this.

XmlNode newNode = newDoc.SelectSingleNode(xpathQuery, manager);
newNode.Attributes.RemoveAll();   
node.ParentNode.InsertAfter(node.OwnerDocument.ImportNode(newNode, true), node);

Answer 3

Have you tried not specifying the namespace in your XmlRoot attribute?

I.e.:

[XmlRoot(ElementName = "url")]
public class SitemapNode
{ 
...
}