public IActionResult Reset() { List <Dachi> ret = HttpContext.Session.GetObjectFromJson <List <Dachi> >("dachi"); Dachi dachi = (Dachi)ret[0]; dachi.reset(); List <object> dachilist = new List <object>(); dachilist.Add(dachi); HttpContext.Session.SetObjectAsJson("dachi", dachilist); return(RedirectToAction("Index")); }