Question

I am trying to handle multiple form submissions by writing an ActionFilter. I am new to the domain of ActionFilters and dont know where to start any help will be much appreciated.
I have looked at this question but couldnt get a starting point

How to handle multiple submissions server-side

Answer 1

I would use antiforgery token for this. You should have it generated already (if you dont want to be vulnerable to CSRF attacks), and it is unique for every generated form.. so you can create an filter which will do basically this :

1. look in form collection for antiforgery token
2. look into session[“LastFormToken”] (or whatever key you like) – if this form (token) already been submitted
3. if yes, drop the request, if no (form is submitted first time), put it in session (so next time it will be found there and request will be dropped)