asp.net mvc 4 async controller hanging on none TaskAsync methods

Question

I\'m using Visual Studio 2011 Beta with 4.5 Beta. There seems to be a bug with ASP.Net MVC 4, where if the method returns a none \"TaskAsync\" task, it hangs the request.

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Answer 1

Known issue with MVC 4 Beta.

In short, add the following to ~/Web.config:

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

Then add await Task.Yield(); as the first line in your action method. (Don't forget the await!)