Azure Notification Hub not working on webform and MVC but works on ConsoleApplication

Question

when i use this code in webform or MVC system keep hangs and stay in this line of code :

 AppleRegistrationDescription vb = 
await hubClient.CreateAppleNativeRegistrationAsync(token, new string[] { tag });

but in Console works fine

this is my code

static async Task<AppleRegistrationDescription> appleregister(string tag, string token)
        {
            var hubClient = NotificationHubClient.CreateClientFromConnectionString("Endpoint=sb://ipluzservicehub.servicebus.windows.net/;SharedAccessKeyName=DefaultFullSharedAccessSignature;SharedAccessKey=o9DAUFuT1n9AyHfuc8REkwo0W/65WAw1SSG+fNJ/xqg=", "taylors");
            AppleRegistrationDescription vb = await hubClient.CreateAppleNativeRegistrationAsync(token, new string[] { tag });
            return vb;
        }
        public ActionResult Index()
        {
            try
            {
                Task<AppleRegistrationDescription> t = appleregister("MYTag", "19606e2xxxxxxxxxxxxxxxxxx");
                var list = t.Result;
                var id = list.RegistrationId;
            }
            catch
            {
            }
            return View();
        }

can any one help me please

Stephen Cleary · Answer 1 · 2013-09-13T23:46:10.283

0

Please ensure that you're using ASP.NET 4.5, and that you have set the httpRuntime.targetFramework element in your web.config to 4.5.

Also, you shouldn't use Result in ASP.NET (or WinForms); you can easily cause a deadlock, as I explain on my blog:

public async Task<ActionResult> Index()
{
  try
  {
    Task<AppleRegistrationDescription> t = appleregister("MYTag", "19606e2xxxxxxxxxxxxxxxxxx");
    var list = await t;
    var id = list.RegistrationId;
  }
  catch
  {
  }
  return View();
}

edited Sep 13 '13 at 23:46

answered Sep 13 '13 at 11:28

Stephen Cleary

437,863
77
675
810

Thanks Stephen , your post gave me good idea, and i learned a lot ,but for this case adding .configureAwait(false); (Elio's post) solved my problem thanks – Brad Kiani Sep 14 '13 at 09:00
It fixed the hang, but that solution will hurt your scalability. – Stephen Cleary Sep 14 '13 at 12:50

score 0 · Accepted Answer · answered Sep 13 '13 at 20:57

0

What kind of failure are you experiencing? Sometimes the async context in ASP.NET app could be the culprit, which causes the async call to hang. Try to use:

 AppleRegistrationDescription vb = await hubClient.CreateAppleNativeRegistrationAsync(token, new string[] { tag }).configureAwait(false);

Let me know!

answered Sep 13 '13 at 20:57

Elio Damaggio

862
4
6

Thanks Elio by Adding .configureAwait(false); Problem has been solved and now working – Brad Kiani Sep 14 '13 at 08:59

Azure Notification Hub not working on webform and MVC but works on ConsoleApplication

2 Answers2