队列应用

public class QueueFactory<T>
    {
        protected static Queue ClassQueue = new Queue();

        protected T CreateRunClass(Type t)
        {
            object ObjClass = Activator.CreateInstance(t);
            ClassQueue.Enqueue(ObjClass);
            return (T)ObjClass;
        }
        public Int32 RemoveClass()
        {
            ClassQueue.Dequeue();
            return ClassQueue.Count;
        }
        public Int32 GetClassRunCount(Type t)
        {
            ////75 is my print job limit.
            //if (ClassQueue.Count > 75) //((UserProfile)ClassQueue.Dequeue()).;
            //{
            //    //ClassQueue.Clear();
            //   //RedirectToAction("Index", "Home");
            //}
            //return CreateClass(ClassName);
            if (ClassQueue.Count <= 3)
            {
                CreateRunClass(t);
            }
            return ClassQueue.Count;
        }


    }

调用：

            UserProfile model=new UserProfile(){.....}
            //判断在线用户数量
            if (new QueueFactory<UserProfile>().GetClassRunCount(model.GetType()) > 3)
            {
                //超出范围
            }        
            //当用户退出时，清除自己当前队列的位置    
 new QueueFactory<UserProfile>().RemoveClass();
            return View();