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using System;
using System.Web;
using System.Web.Mvc;

namespace Site.Helpers.Filters
{
    public class NoCacheAttribute : FilterBaseAttribute
    {
        public NoCacheAttribute() 
            : base(typeof(NoCacheFilter))
        {
        }
    }

    public class NoCacheFilter : IActionFilter
    {
        public void OnActionExecuting(ActionExecutingContext filterContext)
        {
        }

        public void OnActionExecuted(ActionExecutedContext filterContext)
        {
            var response = filterContext.HttpContext.Response;
            response.Cache.SetExpires(DateTime.UtcNow.AddDays(-1));
            response.Cache.SetValidUntilExpires(false);
            response.Cache.SetCacheability(HttpCacheability.NoCache);
            response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
            response.Cache.SetNoStore();
        }
    }
}