Linq 取差集 交集等

 string goodsList = context.Request.Form["goodsList"];
        if (!string.IsNullOrEmpty(goodsList))
        {
            //同步过来物品数据，删除后修改
            List<FSTP_ADPMS_SoakGoodsInfo> goodsLst = Newtonsoft.Json.JsonConvert.DeserializeObject<List<FSTP_ADPMS_SoakGoodsInfo>>(goodsList);
            if(goodsLst.Count != 0) 
            {
                int OrgID = goodsLst[0].OrganiseUnitID;
                QueryBuilder queryBuilder = new QueryBuilder();
                queryBuilder.AddFilter(FSTP_ADPMS_SoakGoodsInfo.FSTP_ADPMS_SOAKGOODS_TABLE, FSTP_ADPMS_SoakGoodsInfo.ORGANISEUNITID_FIELD, "=", OrgID);
                //数据库中存在数据
                List<FSTP_ADPMS_SoakGoodsInfo> oldLst = new FSTP_ADPMS_SoakGoodsBLL().GetModelList(queryBuilder);
                //添加数据
                List<FSTP_ADPMS_SoakGoodsInfo> insertLst = goodsLst.Except(oldLst, new SoakGoodsInfoCompare()).ToList();
                //修改数据
                List<FSTP_ADPMS_SoakGoodsInfo> updateLst = goodsLst.Intersect(oldLst, new SoakGoodsInfoCompare()).ToList();
                if (Goodsbll.Add(insertLst, updateLst) != "0")
                {
                    context.Response.Write(" Resule->OK");
                }
            }       
        }

    //物品对比类
    public class SoakGoodsInfoCompare : IEqualityComparer<FSTP_ADPMS_SoakGoodsInfo>
    {
        public bool Equals(FSTP_ADPMS_SoakGoodsInfo x, FSTP_ADPMS_SoakGoodsInfo y)
        {
            return x.ID == y.ID;
        }


        public int GetHashCode(FSTP_ADPMS_SoakGoodsInfo obj)
        {
            return 0;
        }
    }