Async Controller Returning "System.Threading.Tasks.Task`1[System.Web.Mvc.ActionResult]"

Question

I'm trying to work out why Umbraco 7.2.4 just doesn't seem to handle asynchronous tasks in my ASP.NET MVC controller. I feel like I've read almost every possible stack overflow and umbraco q&a, and tried many possible methods to try narrow down the problem. This is both for Umbraco 7 & MVC 4 and & MVC 5. It works just fine in an MVC project without Umbraco.

HomeController.cs:

using System.Threading.Tasks;
using System.Web.Mvc;
using Umbraco.Web.Models;
using Umbraco.Web.Mvc;

namespace Umbraco.Async.Website.Controllers
{
    public class HomeController : RenderMvcController
    {
        public new async Task<ActionResult> Index(RenderModel model)
        {
            var menuModel = new HomeViewModel(model);
            await Task.Delay(1000);
            return View("Home", menuModel);
        }
    }

    public class HomeViewModel : RenderModel
    {
        public string Test = "Pizza is awesome!!!!";

        public HomeViewModel(RenderModel model)
            : base(model.Content, model.CurrentCulture)
        {

        }
    }
}

Home.cshtml:

@*@inherits Umbraco.Web.Mvc.UmbracoTemplatePage*@
@inherits UmbracoViewPage<Umbraco.Async.Website.Controllers.HomeViewModel>
@{
    Layout = null;
}

<h1>@Model.Test</h1>

In the end the browser shows no rendered view, and just the text string:

System.Threading.Tasks.Task`1[System.Web.Mvc.ActionResult]

See this question elsewhere on SO http://stackoverflow.com/questions/23006976/async-controller-action-with-umbraco-7-returns-string — ProNotion, May 11 '15 at 13:10
Hi @ProNotion, thanks for that, I've tried both solutions in that question on multiple projects (MVC4, MVC5) before with no luck. I will add a comment to their question. Cheers! — legas, May 11 '15 at 21:36
....Also I've tried with a SurfaceController (as in http://stackoverflow.com/questions/23006976/async-controller-action-with-umbraco-7-returns-string) as well as my RenderMvcController. (extra info that might be useful) — legas, May 11 '15 at 21:43

score 0 · Answer 1 · answered May 11 '15 at 11:54

0

Do you have this key in your web.config file? If not, please add it and then try.

<appSettings>
    <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
  </appSettings>

answered May 11 '15 at 11:54

Keval Gangani

1,326
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score 0 · Answer 2 · answered Oct 17 '15 at 14:01

I've raised an issue with Umbraco for this issue as I have ben struggling with this for quite a while. I have written an article on a solution here but in a nutshell you can use this instead:

public async Task<ActionResult> Home(RenderModel model)
{
    var menuModel = new HomeViewModel(model);
    await Task.Delay(1000);
    return View("Home", menuModel);
}

The difference being that the Home action takes precedence over the failing Index action as it is routed from the template name not the document type alias.

Async Controller Returning "System.Threading.Tasks.Task`1[System.Web.Mvc.ActionResult]"

2 Answers2

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