Application的一个菜鸟问题啊

Question

Application.Lock();
        Application["Counter"] = (int)Application["Counter"]+ 1;
        Application.UnLock();我调试，他说我“未将对象引用设置到对象的实例”。
我也已经在Application定义过Counter了啊，为什么这是！谢谢

Answer 1

Application.Lock();
Application["Counter"] = (Application["Counter"]==null?0:Convert.ToInt32(Application["Counter"]))+ 1;
Application.UnLock();

Answer 2

呵呵，谢谢啊，开始学习中啊ASP

Answer 3

Application.Lock();
        Application["Counter"] = Convert.ToInt32(Application["Counter"])+ 1;
        Application.UnLock();