Process multiple user requests with asp.net mvc async controller method

Question

I have long-working sync controller method, and while it is running, I cannot get answers to other user requests.

I made everything async using async/await and ConfigureAwait(False), but I still need to wait.

Simple example:

    public async Task<ActionResult> Index()
    {
        var result = await Task.Run(() => Wait()).ConfigureAwait(false); 

        return View(result);
    }

    private async Task<bool> Wait()
    {
        await Task.Delay(60000);

        return true;
    }

Now, if I send request to this method "mycontroller/Index", I expect that I can get View for another method "anotherController/Index", but I should wait until async method is completed.

Is it normal behavior? Should I use async to free ui thread and make it available until long-running method is completed?

Igor Igor · Accepted Answer · 2015-07-30T16:13:23

ASP.NET serializes same-Session requests to avoid problems of simultaneous writes to the same Session from multiple threads. Actions of controllers marked with session ReadOnly attribute will be executed in parallel:

[SessionState(System.Web.SessionState.SessionStateBehavior.ReadOnly)]
public class MyController : Controller
{
  ...
}

Process multiple user requests with asp.net mvc async controller method

1 Answers