public ActionResult Edit([Bind(Include = "company_id,company_name,company_introduce,company_address,company_phone")] Sys_Info sys_Info)
 {
     if (ModelState.IsValid)
     {
         db.Entry(sys_Info).State = EntityState.Modified;
         db.SaveChanges();
         ViewBag.msg = "更新成功。";
         return(RedirectToAction("Index", new { id = sys_Info.company_id }));
     }
     return(View(sys_Info));
 }
        // GET: Sys_Info
        public ActionResult Index(int?id)
        {
            if (id == null)
            {
                return(new HttpStatusCodeResult(HttpStatusCode.BadRequest));
            }
            Sys_Info sys_Info = db.Sys_Info.Find(id);

            if (sys_Info == null)
            {
                return(HttpNotFound());
            }
            return(View(sys_Info));
        }