. Net core uses feature attribute to verify session login status

1. Create a new. NET Core MVC Project

2. Add a class MyAttribute below the Models folder, which is designed to hold the attributes we define

Here, I only wrote checkloginattribute to verify the login situation.

usingMicrosoft.AspNetCore.Http;usingMICROSOFT.ASPNETCORE.MVC;usingMicrosoft.AspNetCore.Mvc.Filters;usingSystem;namespaceattributestudy.models{ Public classMyAttribute {} Public classCheckloginattribute:attribute,iactionfilter { Public voidOnActionExecuted (ActionExecutedContext context)//execute after method execution        {        }         Public voidOnActionExecuting (ActionExecutingContext context)//execute before method execution        {            if(Context. HttpContext.Session.GetString ("LoginName")==NULL) {context. Result=NewRedirectresult (" Contact");//If the session does not exist, the login is unsuccessful and jumps to the contact page}Else{//Otherwise, do not operate. }        }    }}

Because this is not a controller, we have to use the session to invoke the context of the injection.

Also, using sesion in. Net core has to add a configuration to startup

Configureservices add          services below. Addsession (); Add apps below Configure                  . Usesession ();

. Net core uses feature attribute to verify session login status