Asp.Net Core Middleware service dependent on current User

Question

I would like to either change a request scoped service or set one in a custom middleware layer.

Specifically, I want to be able to do something like the below contrived example in Startup.cs:

public void ConfigureServices(IServiceCollection service)
{
    service.AddScoped<IMyUserDependentService>((provider) => {
        return new MyService());
    });
}

public void Configure(...) {

    //other config removed

    app.Use(async (context, next) => {

        var myService = context.ApplicationServices.GetService<IMyUserDependentService>();


        myService.SetUser(context.User.Identity.Name);//Name is Fred

        next.Invoke();
    });
}

Then in the controller do this:

public class HomeController: Controller
{
    public HomeController(IMyUserDependentService myService)
    {
        //myService.UserName should equal Fred
    }
}

The problem is, that this doesn't work. myService.UserName isn't Fred in controller, it's null. I think that the IOC container is creating a new instance in the controller, and not using the one set in the middleware.

If I change the scope of the service to Transient, Fred is remembered, but that doesn't help because the service is dependent on who the current user is.

To recap, what I need is to create/or edit a service that requires the current user (or other current request variables), but am unable to work this out.

Thanks in advance!

Answer 1

Have you tried using context.RequestServices?