modify asp.net mvc view naming convention

In asp.net mvc 3, View() method will select a view to render by following this naming convention

\Views\Controller\Action.cshtml

How can I modify the naming convention so that it will return Views开发者_如何学C from:

\Views\Theme\Controller\Action.cshtml

Theme is obtained from Session

var theme = Session["SelectedTheme"] ?? "Default";

and here is the current folder structure

- ...
-Controllers
 |-HomeController
 |-AccountController
- ...
-Views
 |-ThemeABC
    |-Home
    |-Account
 |-ThemeXYZ
    |-Home
    |-Account
 |-Default
    |-Home
    |-Account
- ...

I found this post very helpful. from his code, I just need to modify LocationFormats in constructor as follows.

public class AndraViewEngine : RazorViewEngine
{
    public AndraViewEngine()
    {
        base.ViewLocationFormats = new string[] { 
            "~/Views/{2}/{1}/{0}.cshtml", 
            "~/Views/{2}/Shared/{0}.cshtml",
            "~/Views/{1}/{0}.cshtml", 
            "~/Views/Shared/{0}.cshtml"
        };

        base.PartialViewLocationFormats = new string[] {
            "~/Views/{2}/{1}/{0}.cshtml", 
            "~/Views/{2}/Shared/{0}.cshtml",
            "~/Views/{1}/{0}.cshtml", 
            "~/Views/Shared/{0}.cshtml"
        };
    }

    /* the rest of the code in that post */
}