MVC3 ef4增删改

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//ef类
 GpsWebContext gdb = new GpsWebContext();
        /// <summary>
        ///查 
        /// </summary>
        /// <returns>数据结果</returns>
        public IList<实体类名> Gps_AlarmInfoList()
        {
            return gdb.Gps_AlarmInfo.ToList();
        }
　　　　//增加
        public bool Add(实体类名 m)
        {
            bool flag = false;
            try
            {
                 gdb.实体类名.Add(m);
                 gdb.SaveChanges();
                 flag = true;
            }
            catch (Exception ee)
            {
                 throw ee.InnerException;
            }
            return flag;
        }
　　　　//修改
        public bool Edit(实体类名 m)
        {
            bool flag = false;
            try
            {
                 gdb.Entry(m).State = EntityState.Modified;
                 gdb.SaveChanges();
                 flag = true;
            }
            catch (Exception ee)
            {
                 throw ee.InnerException;
            }
            return flag;
        }
　　　　//删除
        public bool Del(int id)
        {
            bool flag = false;
            try
            {
                 gdb.实体类名.Remove(gdb.实体类名.Find(id));
                 gdb.SaveChanges();
                 flag = true;
            }
            catch (Exception ee)
            {
                 throw ee.InnerException;
            }
            return flag;
        }
　　　　//明细
　         public 实体类名 Details(int id)
        {
            return gdb.实体类名.Find(id);
        }