Is there any VirtualPathProvider working sample in mvc4 razor?

I have read dozens of related threads and made my very simple virtual provider from samples.But it does not render virtual file stream. just showing plan text.Here is the output.@inherits System.Web.Mvc.WebViewPage @{ViewBag.Title = "Hellow World !";}<h2>Hellow World !</h2>There are related threads about this, but they are not saying how they solved it or the solution does not work. I can't find what did I wrong.VirtualPathProvider not parsing razor markupMVC3 Custom VirtualPathProvider not rendering RazorPulling a View from a datab...Read more