public IActionResult OnPostSubmit()
        {
            var formData = Request.Form;

            //FileHelper.FileAdd("1.txt", formData.ToString()+"\r\n");

            var selectedOptions = new Dictionary<string, string>();

            foreach (var key in formData.Keys)
            {
               
                   
                FileHelper.FileAdd("1.txt", key + "\r\n");
               
                // 这里的 key 就是动态的 name 值
                string selectedValue = formData[key];

                FileHelper.FileAdd("1.txt", selectedValue + "\r\n");
                //  selectedOptions[key] = selectedValue;


            }

            return Page();
        }