ASP.NET MVC Action Filter - Ajax Only Attribute

The website I’m currently working on has a lot of AJAX incorporated in it, so my controller has a few actions which are only called in AJAX. At first I was using HttpContext.Request.IsAjaxRequest() within my action to control if the request was indeed an Ajax one, but I didn’t like the fact that I needed to call HttpContext in my control; it also made a lot of redundant code. That is why I decided to build an Action Filter that would do that for me.