.NET调用外部接口将得到的List数据，并使用XmlSerializer序列化List对象成XML格式

　　　　　　　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", "1");
            param.Add("PageSize", "100000");
            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, "998020");
            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();

PS：使用XmlSerializer序列化List对象成XML格式

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());
}