title: AsyncController missing in MVC 6
body: <p>I'm trying to use the id parameter with an async iactionresult method, but it is coming through as null.</p>
  
  <p>If I inherit from Controller and use - </p>
  
  <pre><code>public IActionResult Index(string id)
  </code></pre>
  
  <p>there is no problem. But when I use -></p>
  
  <pre><code>    public async Task&lt;IActionResult&gt; Index(string id)
  </code></pre>
  
  <p>(which is what I need) the id parameter is always null. I am trying to inherit from the AsyncController to do this, however I am having trouble locating it using:</p>
  
  <pre><code>        "Microsoft.AspNet.Mvc": "6.0.0-beta1"
  </code></pre>
  
  <p>Does anyone know any work around for this? Thanks!</p>