How to Customize root element Name xml and json serialisation?

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I generate xml and json result for my WEB APi application,I try to this result into customize root element name. but have some issues. Here is the Class for the Result

[XmlRoot("country")]
[JsonObject(Title = "country")]

public class CountryData
{
    [XmlElement(ElementName = "iso_code")]
    [JsonProperty(PropertyName = "iso_code")]
    public string IsoCode { get; set; }

    [XmlElement(ElementName = "fips_code")]
    [JsonProperty(PropertyName = "fips_code")]
    public string FipsCode { get; set; }

    [XmlElement(ElementName = "name")]
    [JsonProperty(PropertyName = "name")]
    public string Name { get; set; }

    [XmlElement(ElementName = "region_id")]
    [JsonProperty(PropertyName = "region_id")]
    public string RegionId { get; set; }
}
public class CountryList
{
    [XmlArray("countries")]
    [JsonProperty(PropertyName = "countries")]
    public List<CountryData> Country { get; set; }
    public CountryList()
    {
        Country = new List<CountryData>();
    }
}

I use customXMLFormatter class instead of xmlFormatter and Use the Method

public override Task WriteToStreamAsync(Type type, object value,
        Stream writeStream, System.Net.Http.HttpContent content,
        System.Net.TransportContext transportContext)
    {
       return Task.Factory.StartNew(() =>
       {
           var xns = new XmlSerializerNamespaces();
           var serializer = new XmlSerializer(type);
           xns.Add(string.Empty, string.Empty);
           serializer.Serialize(writeStream, value, xns);
       });             
    }

I try to create xml result as shown below

   <response>
    <response_item>
     <countries>
      <country>
       <iso_code>AF</iso_code>
       <fips_code>AF</fips_code>
       <name>Afghanistan</name>
       <region_id>ASIA</region_id>
      </country>
     </countries>
    </response_item>
   </response>

and Json

[{"countries":[{"iso_code":"AF","fips_code":"AF","name":"Afghanistan","region_id":"ASIA"}]}]

I get the xml as Shown Below

<CountryList>
 <countries>
  <CountryData>
   <iso_code>AE</iso_code>
   <fips_code>AE</fips_code>
   <name>United Arab Emirates</name>
   <region_id>ASIA</region_id>
  </CountryData>
 </countries>
</CountryList>

and Json{"countries":[{"iso_code":"AE","fips_code":"AE","name":"United Arab Emirates","region_id":"ASIA"}]}

How can I generate my actual output? <response><response_item> tag is need for all my xml results.

asked 48 secs ago

Beginner

36

How to Customize root element Name xml and json serialisation?