XML ActionResult for ASM MVC

Usage.cs

// ...    
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return new XMLActionResult<MyClass>(
                new MyClass
                {
                    Data = "Hello, World!"
                });
        }
    }
// ...

XMLActionResult.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Mvc;
using System.IO;
using System.Xml;
using System.Xml.Serialization;

namespace API_backend.Infrastructure
{
    public class XMLActionResult<T> : ActionResult
    {
        private static UTF8Encoding encoding = new UTF8Encoding(false);

        public T Data { get; set; }

        public Type[] IncludedTypes = new[] { typeof(object) };

        public XMLActionResult(T data)
        {
            Data = data;
        }

        public XMLActionResult(T data, Type[] extraTypes)
        {
            Data = data;
            IncludedTypes = extraTypes;
        }

        public override void ExecuteResult(ControllerContext context)
        {
            using (MemoryStream stream = new MemoryStream())
            {
                using (var xmlWriter =
                    XmlTextWriter.Create(stream,
                        new XmlWriterSettings()
                        {
                            OmitXmlDeclaration = true,
                            Encoding = encoding,
                            Indent = true
                        }))
                {
                    new XmlSerializer(typeof(T), IncludedTypes)
                        .Serialize(xmlWriter, Data);
                }

                new ContentResult
                {
                    ContentType = "text/xml",
                    Content = encoding.GetString(stream.ToArray()),
                    ContentEncoding = encoding
                }.ExecuteResult(context);
            }
        }
    }
}