Application对象

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

https://msdn.microsoft.com/zh-cn/library/system.web.httpapplicationstate%28v=vs.110%29.aspx

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<int>;
11             if (obj == null)
12             {
13                 obj = new List<int>() { 1 };
14             }
15             else
16             {
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         }

Test