[ASP.net MVC] Session Expire Attribute

當session timeout時, 若不作處理, 運作時有機會throw exception. 為應對此情況, 可以自訂一個Attribute, 當controller / action call 時, 便會先行attribute.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace Test.Attributes
{
    public class SessionExpireAttribute : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            HttpContext ctx = HttpContext.Current;
            // check sessions here
            if (HttpContext.Current.Session["userName"] == null)
            {
                filterContext.Result = new RedirectResult("~/Account/Login");
                return;
            }
            base.OnActionExecuting(filterContext);
        }
    }
}