.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

The context is held in the controller class only, if you need session info within a model class, pass the session object as a parameter of a method of your class via a controller. Otherwise your are kind of breaking the design pattern. — Nerevar, May 23 '18 at 09:22

score 8 · Answer 1 · answered Nov 26 '19 at 03:14

To access session in non-controller class -

First, register the following service in Startup.ConfigureServices

  services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

Now, register a class (example - SessionManager) where you want to access the Session in Startup.ConfigureServices.
```
  services.AddScoped<SessionManager>(); 
```

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.

score 2 · Accepted Answer · answered May 23 '18 at 09:21

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);

answered May 23 '18 at 09:21

CodeCaster

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Actually i am trying to check the session in a custom ClaimRequirementFilter. So from a central location i want to check the session. I mean if the session is found then give the access to user else show unotherised page. – abhishek May 23 '18 at 09:31
Umm so why didn't you begin by explaining that? You can just [access `filterContext.HttpContext.Session` in `OnActionExecuting()`](https://stackoverflow.com/questions/32925219/how-to-create-a-custom-attribute-that-will-redirect-to-login-if-it-returns-false). – CodeCaster May 23 '18 at 09:33
1

Oh ! my :) that was so easy.. Thanks Man! – abhishek May 23 '18 at 09:38

.Net Core Use Session in Class

2 Answers2