public ActionResult Edit(int id=1)
        {
            Sys_User tenant = zdfa_ky.Sys_User.Find("锤子");
            if (tenant == null)
            {
                return HttpNotFound();
            }
            return View(tenant);
        }

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Edit(Sys_User tenant)
        {

            zdfa_ky.Entry<Sys_User>(tenant).State = EntityState.Modified;


            int A = zdfa_ky.SaveChanges();

            if (A > 0)
            {
                ContentResult content = new ContentResult();

                content.Content = string.Format("<script type='text/javaScript'>alert(\"保存成功！\");</script>");

                return content;
            }
            else
            {
                return View();
            }
            // return View(tenant);
        }