CODE EXAMPLE FOR CSHARP

Get the current culture in a controller asp.net-core 6

public async Task<IActionResult> Index() {
    // Retrieves the requested culture
    var rqf = Request.HttpContext.Features.Get<IRequestCultureFeature>();
    // Culture contains the information of the requested culture
    var culture = rqf.RequestCulture.Culture;
    return View();
}