public string SysPermissionAdd(T_SYS_PERMISSION obj)
 {
     using (SysPermissionBLL bll = new SysPermissionBLL())
     {
         string keyString = "PermissionAllPagingCache" ;
         WCFCache.Current[keyString] = null;//清缓存
         return bll.AddPermission(obj);
     }
     //bll.Add(obj);
 }