How to create custom ViewEngine in MVC 2

As is we know, by default, the ViewEngine of MVC  is WebFormsViewEngine. After refector the source code, I find that the engine implement IView and VirtualPathProviderViewEngine. So we also can create custom engine.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

using System.Xml;

using System.Xml.Xsl;

using System.Xml.Linq;

namespace MvcApplication1.Models

{

    public class XSLTViewEngine:VirtualPathProviderViewEngine

    {

        public XSLTViewEngine() {

            ViewLocationFormats = PartialViewLocationFormats = new[] { 

               "~/Views/{1}/{0}.xslt","~/Views/Shared/{0}.xslt"

            };

        }

        protected override IView CreatePartialView(ControllerContext controllerContext, string partialPath)

        {

            return new XSLTView(controllerContext, partialPath);

        }



        protected override IView CreateView(ControllerContext controllerContext, string viewPath, string masterPath)

        {

            return new XSLTView(controllerContext, viewPath);

        }

    }

    public class XSLTView : IView

    {

        private readonly XslCompiledTransform _template;

        public XSLTView(ControllerContext context, string viewPath)

        {

            _template = new XslCompiledTransform();

            _template.Load(context.HttpContext.Server.MapPath(viewPath));

        }

        #region IView Members



        public void Render(ViewContext viewContext, System.IO.TextWriter writer)

        {

            XDocument xmlModel = viewContext.ViewData.Model as XDocument;

            if (xmlModel != null)

            {

                _template.Transform(xmlModel.CreateReader(), null, writer);

            }

            else throw new ArgumentException("Invalid xdocument");

        }



        #endregion

    }

}

After that , we should register the ViewEngine in Global.asax.

 protected void Application_Start()

        {

            AreaRegistration.RegisterAllAreas();



            RegisterRoutes(RouteTable.Routes);

            ViewEngines.Engines.Clear();

            ViewEngines.Engines.Add(new XSLTViewEngine());

        }

Of course, we can sepecify the engin in controller.

        public ActionResult Index()

        {

            ViewResult result =  View(GetBooks());

            result.ViewEngineCollection = new ViewEngineCollection(){

               new XSLTViewEngine()

             };

            return result;

        }