Serialize XML from C# class, need to set namespaces -

i'm having trouble getting top-level element using xmlserializer (and c# attributes):

<rootobject xmlns="http://www.example.com/xmlschemas/nonstandardschema"      xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"      xsi:schemalocation="http://www.example.com/xmlschemas/nonstandardschema1.xsd">     <otherserializedobjects /> </rootobject> 

currently, closest i've gotten this:

<rootobject xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"      xmlns:xsd="http://www.w3.org/2001/xmlschema"      d1p1:schemalocation="http://www.example.com/xmlschemas/nonstandardschema1.xsd"      xmlns:d1p1="xsi"      xmlns="http://www.example.com/xmlschemas/nonstandardschema">     <otherserializedobjects /> </rootobject> 

c#

[xmlroot("rootobject", namespace = "http://www.example.com/xmlschemas/nonstandardschema")] public class rootobject {     [xmlattribute("schemalocation", namespace = "xsi")]     public string schemalocation { get; set; }      [xmlelement("image")]     public object[] otherserializedobjects { get; set; }      public rootobject()     {         otherserializedobjects = new object[]{};     } }     public class program {     static void main(string[] args)     {         var rootobject = new rootobject         {             schemalocation = "http://www.example.com/xmlschemas/nonstandardschema1.xsd",             otherserializedobjects = new object[]{}         };          var serializer = new xmlserializer(typeof(rootobject));         var stringwriter = new stringwriter();         serializer.serialize(stringwriter, rootobject);         console.writeline(stringwriter.tostring());      } } 

any ideas?

firstly, [xmlattribute(namespace=x)] attribute on schemalocation field/property needs have full namespace value of x, not local namespace shortcut. incidentally, can property rather field. using field purpose wastes memory.

secondly, eliminate standard xmlns:xsd="http://www.w3.org/2001/xmlschema", use xmlserializer.serialize overload pass in xmlserializernamespaces namespaces want.

thus:

[xmlroot("rootobject", namespace = "http://www.example.com/xmlschemas/nonstandardschema")] public class rootobject {     public static xmlserializernamespaces getadditionalnamespaces()     {         xmlserializernamespaces xsns = new xmlserializernamespaces();           xsns.add("", "http://www.example.com/xmlschemas/nonstandardschema");         xsns.add("xsi", "http://www.w3.org/2001/xmlschema-instance");          return xsns;     }      [xmlattribute("schemalocation", namespace = "http://www.w3.org/2001/xmlschema-instance")]     public string xsdschemalocation     {                 {             return "http://www.example.com/xmlschemas/nonstandardschema1.xsd";         }         set         {             // nothing - fake property.         }     }      [xmlelement("image")]     public object[] otherserializedobjects { get; set; }      public rootobject()     {         otherserializedobjects = new object[]{};     } }    

and use like:

        var rootobject = new rootobject         {             otherserializedobjects = new object[]{}         };          var serializer = new xmlserializer(typeof(rootobject));         var stringwriter = new stringwriter();         var ns = rootobject.getadditionalnamespaces();          var settings = new xmlwritersettings() { indent = true, indentchars = "    " }; // cosmetic purposes.         using (var xmlwriter = xmlwriter.create(stringwriter, settings))         {             serializer.serialize(xmlwriter, rootobject, ns);         }          console.writeline(stringwriter.tostring());  

example fiddle.