DataContract XML serialization and XML attributes

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This can be achieved, but you will have to override the default serializer by applying the [XmlSerializerFormat] attribute to the DataContract. Although it can be done, this does not perform as well as the default serializer, so use it with caution.

The following class structure will give you the result you are after:

using ...
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Xml.Serialization;

[DataContract]
[XmlSerializerFormat]
public class root
{
   public distance distance=new distance();
}

[DataContract]
public class distance
{
  [DataMember, XmlAttribute]
  public string units="m";

  [DataMember, XmlText]
  public int value=1000;
}

You can test this with the following code:

root mc = new root();
XmlSerializer ser = new XmlSerializer(typeof(root));
StringWriter sw = new StringWriter();
ser.Serialize(sw, mc);
Console.WriteLine(sw.ToString());
Console.ReadKey();

The output will be:

<?xml version="1.0" encoding="utf-16"?>
<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                                   xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <distance units="m">1000</distance>
</root>

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