用Linq操作数据小记

小记

         public void UpdateWarhouse(Administrator admin)
         {
             var warhouseStr = Request["warhouse"];
             if (!string.IsNullOrEmpty(warhouseStr))
             {

                 var storageListAll = CacheAccess.GetStorages(_storageContract);

                 int[] selectedId = warhouseStr.Split(',').Select(c => Convert.ToInt32(c)).ToArray();
                 List<Storage> selectStorages=storageListAll.Where(c=> selectedId.Contains(c.Id)).ToList();
                 List<Storage> removeStorages = admin.Stoages.Where(c => !selectStorages.Contains(c)).ToList();
                 List<Storage> newAddStorages = selectStorages.Where(c => !admin.Stoages.Contains(c)).ToList();

                 foreach (var item in removeStorages)
                 {
                     admin.Stoages.Remove(item);
                 }
                 foreach(var item in newAddStorages)
                 {
                     admin.Stoages.Add(item);
                 }

             }

         }

selectedId 是从画面上取得的选中的值 string 类型 “1,2,3,4”