问题
If get this from the Microsoft official documentation:
The Application_Start and Application_End methods are special methods that do not represent HttpApplication events. ASP.NET calls them once for the lifetime of the application domain, not for each HttpApplication instance.
I was sure that Application_Start was related to the HttpApplication, here this guy explains why I was wrong. Which object/entity is related to the Application_Start event?
回答1:
As the documentation says, the events are linked to the lifetime of the application domain, which in practice means the app pool which the application is running in. Application_Start will fire again if the app pool is recycled for any reason - a change to web.config, for example.
来源：https://stackoverflow.com/questions/7093026/application-start-asp-net