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 namespace to the xml serialization namepsace collections so as not to get the superfluous attributes I did not intend to have.

Edit: The attribute I mean are these:

<url xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'; xmlns:xsd='http://www.w3.org/2001/XMLSchema'; xmlns=''> 

so it gives me two extra attributes.

After further investigation if I change the beginning of the document from:**

writer.WriteStartElement('urlset','http://www.sitemaps.org/schemas/sitemap/0.9'); 

to

writer.WriteStartElement('urlset'); 

**Then I do not get the empty xmlns=” attribute in the url tags. This is great BUT I do require that the root element have xmlns='http://www.sitemaps.org/schemas/sitemap/0.9', i.e.:

<urlset xmlns='http://www.sitemaps.org/schemas/sitemap/0.9'> 

But I still get an empty xmlns='' attribute in the serialized type.

[XmlRoot(ElementName = 'url', Namespace='')] public class SitemapNode {     [XmlElement(ElementName = 'loc')]     public string Location { get; set; }     [XmlElement(ElementName = 'lastmod')]     public DateTime LastModified { get; set; }     [XmlElement(ElementName = 'changefreq')]     public SitemapChangeFrequency ChangeFrequency { get; set; }     [XmlElement(ElementName = 'priority')]     public decimal Priority { get; set; }      public SitemapNode()     {         Location = String.Empty;         LastModified = DateTime.Now;         ChangeFrequency = SitemapChangeFrequency.monthly;         Priority = 0.5M;     }      public SitemapNode(string location, DateTime lastModified, SitemapChangeFrequency changeFrequency, decimal priority)     {         Location = location;         LastModified = lastModified;         ChangeFrequency = changeFrequency;         Priority = priority;     } } 

Then I use the following to append to my XmlWriter:

foreach (uk.co.andrewrea.SitemapNode node in List) {     XmlSerializerNamespaces ns = new XmlSerializerNamespaces();     ns.Add(String.Empty, String.Empty);     Serializer.Serialize(Writer, node, ns); } 

This works out fine except I am left with an emtpy xmlns=” like this

<url xmlns=''> 

Anyone any ideas? Again I can achieve this using the XmlTextWriter and the XmlDocument but I need to achieve it using the XmlWriter.

Any help is greatly appreciated.

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>