BidOpeningData.BidSupervisionSoapClient client = new BidOpeningData.BidSupervisionSoapClient();

            Dictionary<string, string> param = new Dictionary<string, string>();

            param.Add(CommonParam.ConnKey, DBConnHelper.GetConnectionKey(DBConnHelper.BusinessData));

            param.Add(CommonParam.AppNo, SystemPlatformEnum.BackStage_Platform);

            param.Add(CommonParam.FunctionNo, ((int)SystemModuleEnum.BackStage_AssistQuery).ToString());

            param.Add(CommonParam.Command, "FindBidOpeningList");

            param.Add("PageIndex", "");

            param.Add("PageSize", "");

            param.Add("BidOpenDateStart", Request.QueryString["BidOpenDateStart"]);//开始时间

            param.Add("BidOpenDateEnd", Request.QueryString["BidOpenDateEnd"]);//结束时间

            System.Data.DataSet ds = new System.Data.DataSet("QueryDataSet");

            apiHelper.GetDataTable(param, ref ds, "QueryTable");

            string  queryXmlStr = ds.GetXml();

            var aaa = client.GetBidOpeningList(queryXmlStr);

            List<BidOpeningData.BidOpeningInfo> lst = new List<BidOpeningData.BidOpeningInfo>();

            //lst = aaa.ToList();

            //过滤重复数据

            lst = aaa.Distinct().ToList();

            lst = lst.Where((x, i) => lst.FindIndex(z => z.BidSectionDataKey == x.BidSectionDataKey) == i).ToList();

            XmlDocument xd = new XmlDocument();

            using (StringWriter sw = new StringWriter())

            {

                XmlSerializer xz = new XmlSerializer(lst.GetType());

                xz.Serialize(sw, lst);

                xd.LoadXml(sw.ToString());

            }

            //xd.LastChild.OuterXml

            param.Clear();

            param.Add(CommonParam.ConnKey, DBConnHelper.GetConnectionKey(DBConnHelper.MaccoData));

            param.Add(CommonParam.AppNo, SystemPlatformEnum.BackStage_Platform);

            param.Add(CommonParam.FunctionNo, "");

            param.Add(CommonParam.Command, "DoSaveBidOpeningRecord");

            param.Add("ArrayOfBidOpeningInfo", xd.LastChild.InnerXml.Replace(" xmlns=\"http://tempuri.org/\"",""));

            var result = await apiHelper.HandleData(null, param);//提交信息

            return JsonConvert.DeserializeObject(result).ToString();

XmlDocument xd = new XmlDocument();

using (StringWriter sw = new StringWriter())

{

    XmlSerializer xz = new XmlSerializer(lst.GetType());//lst为List数据

    xz.Serialize(sw, lst);

    Console.WriteLine(sw.ToString());

    xd.LoadXml(sw.ToString());

}