title: Force WCF to call a method on every request before entering actual function
body: <p>I have a RESTful WCF service with many different functions. For each function I need to call an authentication method that I have written. I can manually call this method on every request but I was looking for a way to force the WCF engine to call this method before these functions are entered. Does anyone know if this is possible? </p>
  
  <p>Cheers</p>