title: Get the route value from url in webapi attribute routing
body: <p>I have a webAPI controller which is like</p>
  
  <pre><code>Public class TestController:APIController
  { 
  
  
     [Route(“Api/Test/{testId}/SubTest”)] 
       Public  void Post(int subTestid)
       {
       }
  
  }
  </code></pre>
  
  <p>Our requirement is to get the value of testId from the url inside the post method.
  Could anyone suggest the best way to achieve this.</p>