C#•2y ago

❔ Using HttpContext outside of a controller/request pipeline (.NET 7)

Hi there I am currently busy with porting a "legacy" system from .NET Framework MVC to .NET Core MVC 7 and struggling with implementing some "global" state. Previously the project used the static accessor from System.Web but whenever I try using IHttpContextAccessor outside of a controller or a service I am calling inside of a controller I do not have access. I would like to have a class where I can store some static properties that I use throughout the project. Currently I am trying to use the Session State but when using it outside of the request pipeline the HttpContext will be null. I have some classes that are not used inside of a controller that need access to the HttpContext Session State. I have created a scoped service that I can call inside of controllers or request pipeline and the functionality works but once I step outside of the pipeline I have no access. Any advice is welcome. Behavior trying to replicate:

public static int ClientID
{
    get { return Convert.ToInt32(HttpContext.Current.Session["clientid"]); }
    set { HttpContext.Current.Session["clientid"] = value; }
}

public static int ClientID
{
    get { return Convert.ToInt32(HttpContext.Current.Session["clientid"]); }
    set { HttpContext.Current.Session["clientid"] = value; }
}

14 Replies

Pobiega•2y ago

As you said, when used outside the http request pipeline it will be null. It doesnt even make sense, since you have no session outside the pipeline either Why does the user id need to be static? You can't know what user you are dealing with outside a request either, assuming normal asp workflow

Johannes MOP•2y ago

Does not need to be static but that was the previous implementation done with framework 4.8, I basically need to bring this up to .NET 7 standards of doing things. A lot of data was stored inside of the session state so that it can be pulled at any point in time using some thing like

public static class cCore {
  public static int ClientID
  {
      get { return Convert.ToInt32(HttpContext.Current.Session["clientid"]); }
      set { HttpContext.Current.Session["clientid"] = value; }
  }
}


public class SettingsController : Controller {
    public ActionResult SetUserSettings(TModel model) {
      var userSettings = cUser.SaveUserSettings(model, cCore.ClientID);
    }
}

public static class cCore {
  public static int ClientID
  {
      get { return Convert.ToInt32(HttpContext.Current.Session["clientid"]); }
      set { HttpContext.Current.Session["clientid"] = value; }
  }
}


public class SettingsController : Controller {
    public ActionResult SetUserSettings(TModel model) {
      var userSettings = cUser.SaveUserSettings(model, cCore.ClientID);
    }
}

So basically instead of constantly reaching out and getting that session state value, you have a class that just does that and you can call the prop.

Pobiega•2y ago

But sessions is an asp concept You don't have a session outside of the http request pipeline You need some other way of knowing what user you are operating on. Preferably passing it

Johannes MOP•2y ago

What would you say would be the best way of keep track of variables that should stay constant throughout a session's lifetime i.e. I have some helper classes that use the values stored in the session to dynamically create menu items for the sidebar and topbar?

Pobiega•2y ago

?? Oh, I see. I mean that's fine to be in session? When do you ever render a view outside a http request?

Johannes MOP•2y ago

The whole menu stuff are part of the layout and change based off of some of the values (it is a multi-tenant system) so certain things like user permissions and actions are based off those values that get stored in session and then the menu will render based on what is set in the session. if you have permissions for a certain path it will show and if not it will not show.

Pobiega•2y ago

Sure. Not sure when you need this outside of a request still

Johannes MOP•2y ago

@pobiega we are basically trying to imitate what a JS framework can do in terms of having Global State that only get mutated when needs be.

Pobiega•2y ago

But a js framework app runs per client Asp does not Ie, of you and me both run the same js app, we have different instances and can't share Global state But in asp, the server runs once and has shared global state This is why we avoid global state.

Johannes MOP•2y ago

You're right. Unfortunately I do not know of the best way to implement the session state scenario without having to constantly hit the db to populate the session values per request. because I can do it when a user logs in but when the auth session is still valid it basically hits the home controller and continues to try access the session state values to run other methods

Pobiega•2y ago

Seems fine to me Session storage is usually just an in-memory cache by defau The problem is that you seemed to be trying to access session-specific information outside of a request, and thtmat is just not possible You can't identify the session outside a request. You might have multiple users at once

Johannes MOP•2y ago

Alright, I will have to find a workaround for this. Thank you @pobiega

Pobiega•2y ago

Sure. I don't fully understand the problem thou, generating a menu should reasonably never be done outside a request 🙂

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Using HttpContext outside of a controller/request pipeline (.NET 7)

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