public ActionResult Create(DangerType dangertype)
        {
            if (ModelState.IsValid)
            {
                Db.DangerTypes.Add(dangertype);
                Db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(dangertype);
        }
 public ActionResult Edit(DangerType dangertype)
 {
     if (ModelState.IsValid)
     {
         Db.Entry(dangertype).State = EntityState.Modified;
         Db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(dangertype);
 }
 public ActionResult GetDangerTypeAndAll()
 {
     var list = Db.DangerTypes.ToList();
     var all = new DangerType() { Id = 0, Name = "全部" };
     list.Insert(0, all);
     return Json(list);
 }