基于web.config设置禁用asp.net MVC4中的帐户控制器

I have an ASP.NET MVC4 application in which I would like the AccountController to be easily enabled/disabled by a setting in the web.config. As I would like registrations and logins for a period, and then open up to be public. I am just a little unsure as to the best approach.I have an ASP.NET MVC4 application in which I w