How to update the data returned by the view to the controller?

Question

ASP.NET

there is a construct like
Options _options;
HomeController(IOptions options)
{_options = options;}
void ActionResult Index(Options options)
{_options = options
Redirect...}
... Each time the homepage is navigated, the controller's constructor restarts and overwrites _options, preventing them from most make the changes created in the view and controller. How can this be bypassed?

Answer 1

You need to study the ASP MVC lifecycle to understand that a controller instance lives exactly from request to response. With each new request, a new instance of the controller is created, which means that

void ActionResult Index(Options options)
{_options = options }

does not make sense, with a new request, _options will be empty, even if the constructor does not have a parameter.
If you want to save some settings via ActionResult Index(Options options), then create a global static class to store some parameters for all requests. If these settings are individual for each user, then you can store them in sessions.