Can someone explain this block of ASP.NET MVC code to me, please?

Question

this is the current code in ASP.NET MVC2 (RTM) System.Web.Mvc.AuthorizeAttribute class :-

public virtual void OnAuthorization(AuthorizationConte         


        

Answer 1

call to AuthorizeCore will validate if request is authorized. If authorized, it put an AddValidationCallback in order to test if the cached output is still valid according to cache policy. If so, the cached output is sent to the client.

Regarding the 3 lines for caching; well, first at all you should understand that an output cache must be correct or as correct as possible. In order to meassure its "correctness", the system will test if it meets certain conditions (e.g. it has not been modified). This is stuff can be done in the 3 lines..