Preventing a deadlock when calling an async method without using await

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I need to call a method returning a Task from within

public override void OnActionExecuting(ActionExecutingContext filterContext)

It wont let me make this method async it throws the following

An asynchronous module or handler completed while an asynchronous operation was still pending.

and when calling

 entityStorage.GetCurrentUser().Result

I get a deadlock. How can I avoid this?

I have been playing around with it coming up with stuff like

entityStorage.GetCurrentUser().Result.ConfigureAwait(false).GetAwaiter().GetResult();

But this isn't working. How can I do it? My solution will need to work with ASP.NET 4 and the Async Targetting Pack, I can't use ASP.NET 4.5 as am deploying to Azure.

3 Answers
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