ASP.NET How to register Custom View Engine using OWIN

Question

I'm trying to implement Custom View Engine that will let me specify additional View paths that looks like this:

public class CustomViewEngine : RazorViewEngine
{
    public CustomViewEngine()
    {
        ViewLocationFormats = new[]
        {
            "~/Views/{1}/{0}.cshtml", "~/Views/{1}/{0}.vbhtml",
            "~/Views/Shared/{0}.cshtml", "~/Views/Shared/{0}.vbhtml"
        };
        MasterLocationFormats = new[]
            {
            "~/Views/{1}/{0}.cshtml", "~/Views/{1}/{0}.vbhtml",
            "~/Views/Shared/{0}.cshtml", "~/Views/Shared/{0}.vbhtml"
        };
        PartialViewLocationFormats = new[]
            {
            "~/Views/{1}/{0}.cshtml", "~/Views/{1}/{0}.vbhtml",
            "~/Views/Shared/{0}.cshtml", "~/Views/Shared/{0}.vbhtml",
            "~/Views/Partials/Widgets/{0}.cshtml", "~/Views/Partials/Widgets/{0}.vbhtml"
        };

    }
}

There's a lot of source code how to use it in Global.asax.cs for example here: Can I specify a custom location to "search for views" in ASP.NET MVC? but there's no source that would show how to register this Engine when using OWIN. How to do it?

Answer 1

Try this:

Startup.cs

using System.Web.Mvc;
using Microsoft.Owin;
using Owin;

[assembly: OwinStartup(typeof(WebApplication2.Startup))]

namespace WebApplication2
{
   public class Startup
   {
      public void Configuration(IAppBuilder app)
      {
         ViewEngines.Engines.Clear();
         ViewEngines.Engines.Add(new CustomViewEngine());
      }
   }
}