C# DataTable 序列化

Question

/// <summary>
/// 序列化 DataTable 成 XML
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
private static string SerializeDataTableToXml(DataTable dt)
{
    StringBuilder strBuilder = new StringBuilder();
    XmlWriter writer = XmlWriter.Create(strBuilder);
    XmlSerializer serializer = new XmlSerializer(typeof(DataTable));
    serializer.Serialize(writer, dt);
    writer.Close();
    return strBuilder.ToString();
}

/// <summary>
/// 序列化 XML 成 DataTable
/// </summary>
/// <param name="xml"></param>
/// <returns></returns>
private static DataTable SerializeXmlToDataTable(string xml)
{
    StringReader strReader = new StringReader(xml);
    XmlReader xmlReader = XmlReader.Create(strReader);
    XmlSerializer serializer = new XmlSerializer(typeof(DataTable));
    DataTable dt = serializer.Deserialize(xmlReader) as DataTable;
    return dt;
}

DMWebSvrSoapClient dmwss = new DMWebSvrSoapClient();
DateTime date = DateTime.Now;
string dataStr1 = dmwss.GetVehicleInfo_Month(date.ToString("yyyy-MM-dd"));

XmlDocument xmldoc = new XmlDocument();
xmldoc.LoadXml(dataStr1);
XmlNodeList xnList = xmldoc.SelectNodes("//DocumentElement/list");
foreach (XmlNode xn in xnList)
{
     ListViewItem item = new ListViewItem(xn["time"].InnerText);
     item.SubItems.Add(xn["in_vehicle_count"].InnerText);
     item.SubItems.Add(xn["out_vehicle_count"].InnerText);
     listView.Items.Add(item);
}