MSDN中HttpApplicationState 类介绍，Application是HttpApplicationState的实例化

一直不知道怎么调取，询问了一下，Controller中直接通过HTTPContext调取的

HttpContext.Application

使用Application对象

 

1         public ActionResult TestShow() 2         { 3             return Json(HttpContext.Application["Test"],JsonRequestBehavior.AllowGet); 4         } 5  6         public ActionResult TestWrite() 7         { 8             //加锁，针对并发问题 9             HttpContext.Application.Lock();10             var obj = HttpContext.Application["Test"] as List
      
       ;11             if (obj == null)12             {13                 obj = new List
       
        () { 1 };14             }15             else16             {17                 obj.Add(obj.Count + 1);18             }19             HttpContext.Application["Test"] = obj;20             HttpContext.Application.UnLock();21             return Json(HttpContext.Application["Test"],JsonRequestBehavior.AllowGet);22         }