title: Custom WCF MessageFormatter
body: <p>I have a .NET 4 WCF service (MEX and HttpGET).</p>
  
  <p>For the HttpGET endpoint, I would like to override the default MessageFormatter.DeserializeRequest to map UriTemplate to strongly-typed objects.</p>
  
  <p>Ideally, a custom attribute would be used to decorate the methods that should use this formatter, but I'm not sure whether I can switch the formatter in that regard.</p>
  
  <p>Is this doable, and can someone walk me through the configuration needed in app.config?</p>