C# MVC4 ActionResult ActionFilter for FormCollection-Collection of common programming errors

I have the following ActionResults and one is meant to be an override of the other that accepts a FormCollection as a parameter.

   [HttpPost]
    public ActionResult PartialAverageDisplay()
    {
        HomeModel C = new HomeModel();
        ChViewModel D = new ChViewModel();
        D = C.AverageCalculation();

        return PartialView(D);
    }
   [HttpPost]
    public ActionResult PartialAverageDisplay(FormCollection myFcollection)
    {
         HomeModel C = new HomeModel();
         System.Data.DataTable myDT = new System.Data.DataTable();
         myDT = (DataTable)Session["DT"];
         ChViewModel D = new ChViewModel();
         D = C.AverageCalculation(myDT, myFcollection);

            return PartialView(D);
        }

I’ve been unable to find an example online of how to create an actionfilter attribute for requiring a FormCollection. Everything Ive seen has used an array of strings. Im not experienced with creating actionfilters. Can anyone explain to me how to approach this?

Thanks