How Can I add an XSI type to an element that is being serialized using LINQ

Question

I want to serialize an Object of a Type of a particular class and containing a particular XSI Type

Can I Do this in LINQ ?

Answer 1

To get the following XML:

<Model xsi:type="SettingsModel" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Name>Test05</Name>
  <IsActive>false</IsActive>
  <IsHidden>false</IsHidden>
</Model>

You can use the following code:

var model = new { Name = "Test05", IsActive = false, IsHidden = false };

var namespaceName = "http://www.w3.org/2001/XMLSchema-instance";
XNamespace xsi = XNamespace.Get(namespaceName);
var x = new XElement("Model",
    new XAttribute(xsi + "type", "SettingsModel"),
    new XAttribute(XNamespace.Xmlns + "xsi", namespaceName),
    new XElement("Name", model.Name),
    new XElement("IsActive", model.IsActive),
    new XElement("IsHidden", model.IsHidden)
    );

Console.WriteLine(x);

LINQ to XML is an exercise in frustration. In the long term you may prefer to use concrete classes with appropriate XML serialization decorators.

=== edit ===

Here is some additional code that writes the data to an XML file:

var settings = new XmlWriterSettings()
{
    Indent = true,
    OmitXmlDeclaration = true
};
using (var stream = new FileStream("Test05.xml", FileMode.OpenOrCreate, FileAccess.Write, FileShare.None))
using (var writer = XmlWriter.Create(stream, settings))
{
    x.WriteTo(writer);
}