.Net Core Use Session in Class

Question

I am using Session in .Net core, However i am able to set and get the Session data in Controller like

HttpContext.Session.SetString("User", "True");
var user = HttpContext.Session.GetString("User");

But when i am trying to use the same code in a concrete class i am not able to do so. It does not show GetString or SetString after HttpContext.Session.

It does not work after

HttpContext.Session

Please help Thanks

Answer 1

To access session in non-controller class -

1. First, register the following service in Startup.ConfigureServices

     services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>(); 
   

2. Now, register a class (example - SessionManager) where you want to access the Session in Startup.ConfigureServices.

     services.AddScoped<SessionManager>(); 
   

3. Now, in SessionManager class, add the following code.

     private readonly IHttpContextAccessor _httpContextAccessor;    
     private readonly ISession _session;    
     public SessionManager(IHttpContextAccessor httpContextAccessor)    
     {    
            _httpContextAccessor = httpContextAccessor;    
            _session = _httpContextAccessor.HttpContext.Session;    
      }  
   

The above code is receiving IHttpContextAccessor object through dependency injection and then, it is storing Sessions in a local variable.

Answer 2

That's because HttpContext is a member of Controller, and outside a controller, it's a type name. See Access the current HttpContext in ASP.NET Core how to inject the IHttpContextAccessor into a class and access the session from there.

However, it's generally inadvisable to use the session in a class library. You'd better pass the particular values to your library call. So instead of accessing the settings in the library method, you do:

// controller code

var user = HttpContext.Session.GetString("User");
var libraryResult = _fooLibrary.Bar(user);
HttpContext.Session.SetString("UserResult", libraryResult);