通过ViewData将数据传回ActionFilter的视图

I have created a little execution timer and as an extra id like to be able to have the option to display all timing results on the bottom of a view via the ViewData for live timers whilst developing (Opposed to placing all entries in a database to monitor performance) Basically the timer places all time splits into a list> and I am currently trying to pass this into ViewData but when its received the other end I seem unable to cast it back.I have created a little execution timer and as