Umbraco XPath query with tokens

MyController.cs

using System.Web.Mvc;
using Umbraco.Web.Models;
using Umbraco.Web;
using Umbraco.Core.Xml;
using Umbraco.Web.Mvc;

namespace MyWebsite.Controllers
{
    public class MyController : RenderMvcController
    {
        public override ActionResult Index(RenderModel model)
        {
            var siteRoot = model.Content.Site();
            var tokens = new[] { new XPathVariable("rootId", siteRoot.Id.ToString()) };

            var blogPosts = Umbraco.TypedContentAtXPath("id($rootId)[@isDoc]//blogPost", tokens);
            
            //Do something with blog posts before passing a model to the view.
            var viewModel = new MyViewModel {
                posts = blogPosts
            };
            
            return View(viewModel);
        }
    }
}

@naepalm no worries :) I've updated my gist to include Chriztian's suggestion. That looks a lot cleaner now.