An async/await example that causes a deadlock

Question

I came across some best practices for asynchronous programming using c#\'s async/await keywords (I\'m new to c# 5.0).

One of the advices gi

Answer 1

A work around I came to is to use a Join extension method on the task before asking for the result.

The code look's like this:

public ActionResult ActionAsync()
{
  var task = GetDataAsync();
  task.Join();
  var data = task.Result;

  return View(data);
}

Where the join method is:

public static class TaskExtensions
{
    public static void Join(this Task task)
    {
        var currentDispatcher = Dispatcher.CurrentDispatcher;
        while (!task.IsCompleted)
        {
            // Make the dispatcher allow this thread to work on other things
            currentDispatcher.Invoke(delegate { }, DispatcherPriority.SystemIdle);
        }
    }
}

I'm not enough into the domain to see the drawbacks of this solution (if any)