title: How can I tell if my action is being called by RenderAction?
body: <p>I have an action that could potentially be called via a normal link, in which case I'd return a View(), or it could also be called via AJAX or RenderAction (ie as a Child Action) in which case I'd return a PartialView().</p>
  
  <p>Sorting out the AJAX part is easy - but how can I test if my action is being rendered as a Child Action?</p>
  
  <p>Ideally, I'd like to be able to write code like this:</p>
  
  <pre><code>if (Request.IsAjaxRequest() || Request.IsChildAction())
      return PartialView();
  
  return View();
  </code></pre>
  
  <p>Obviously the Request.IsChildAction() does not exist - is there something simlilar, or do I just need to create a special ChildAction that always returns a PartialView?</p>