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here is the list of major events in global.asax file. suppose when we write code for each event in global.asax file to handle situation and when we will work with ASP.NET Core Middleware then tell me how to address each event code in ASP.NET Core Middleware. please come with a sample code to address all events in ASP.NET Core Middleware.
Application_Init:
Fired when an application initializes or is first called. It is invoked for all HttpApplication object instances.
Application_Disposed:
Fired just before an application is destroyed. This is the ideal location for cleaning up previously used resources.
Application_Error:
Fired when an unhandled exception is encountered within the application.
Application_Start:
Fired when the first instance of the HttpApplication class is created. It allows you to create objects that are accessible by all HttpApplication instances.
Application_End:
Fired when the last instance of an HttpApplication class is destroyed. It is fired only once during an application's lifetime.
Application_BeginRequest:
Fired when an application request is received. It is the first event fired for a request, which is often a page request (URL) that a user enters.
Application_EndRequest:
The last event fired for an application request.
Application_PreRequestHandlerExecute:
Fired before the ASP.NET page framework begins executing an event handler like a page or Web service.
Application_PostRequestHandlerExecute:
Fired when the ASP.NET page framework has finished executing an event handler.
Applcation_PreSendRequestHeaders:
Fired before the ASP.NET page framework sends HTTP headers to a requesting client (browser).
Application_PreSendContent:
Fired before the ASP.NET page framework send content to a requesting client (browser).
Application_AcquireRequestState:
Fired when the ASP.NET page framework gets the current state (Session state) related to the current request.
Application_ReleaseRequestState:
Fired when the ASP.NET page framework completes execution of all event handlers. This results in all state modules to save their current state data.
Application_ResolveRequestCache:
Fired when the ASP.NET page framework completes an authorization request. It allows caching modules to serve the request from the cache, thus bypassing handler execution.
Application_UpdateRequestCache:
Fired when the ASP.NET page framework completes handler execution to allow caching modules to store responses to be used to handle subsequent requests.
Application_AuthenticateRequest:
Fired when the security module has established the current user's identity as valid. At this point, the user's credentials have been validated.
Application_AuthorizeRequest:
Fired when the security module has verified that a user can access resources.
Session_Start:
Fired when a new user visits the application Web site.
Session_End:
Fired when a user's session times out, ends, or they leave the application Web site.
Thanks
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You can handle default errors at the application level either by modifying your application's configuration or by adding an Application_Error handler in the Global. asax file of your application. You can handle default errors and HTTP errors by adding a customErrors section to the Web. config file.
Global. ASP.NET Core introduced a new mechanism for bootstrapping an app. The entry point for ASP.NET applications is the Global. asax file. Tasks such as route configuration and filter and area registrations are handled in the Global.
In this article, we learnt that Global. asax is a file used to declare application-level events and objects. The file is responsible for handling higher-level application events such as Application_Start, Application_End, Session_Start, Session_End, and so on.
Application_Error() – fired when an error occurs. Session_End() – fired when the session of a user ends. Application_End() – fired when the web application ends. Application_Disposed() - fired when the web application is destroyed.
Regarding session in ASP.NET Core
Classic ASP.NET includes a couple of session-related events: Session_Start and Session_End, which you can access via global.asax in order to execute code. In ASP.NET Core 1.0 , you can query the session collection using middleware to establish if a session has already been established to replicate the Session_Start event, but there are no plans to introduce an equivalent to Session_End.
Since one of the driving forces behind ASP.NET Core 1.0 is "cloud-readiness", the focus on session management design has been to make it work in a distributed scenario. Session_End only ever fired when sessions used inproc mode (local server memory) and the .NET Core team have stated that they won't add features that only work locally.
Take a look here for managing Application Session in ASP.NET Core.
HttpModules
HttpModules have been replaced by middleware in ASP.NET Core and events such Application_BeginRequest or Application_EndRequest are methods of global.asax which is an Http_Module. So, to replace those you have to write your own middleware.
I will not write that code for you but everything what you need (with code samples!) is here: Migrating HTTP handlers and modules to ASP.NET Core middleware.
Authenticate
Regarding Application_AuthenticateRequest, you should also read the document about Request features.
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