public DataTable GetVehicleInf(string hphm, string hpzl, out string code, out string message) { code = ""; message = ""; try { XmlDocument xmldoc = new XmlDocument(); XmlElement xmlelem = xmldoc.CreateElement("", "root", ""); xmldoc.AppendChild(xmlelem); XmlNode root = xmldoc.SelectSingleNode("root"); //查找<Employees> XmlElement xe1 = xmldoc.CreateElement("QueryCondition"); //创建一个<Node>节点 XmlElement xe2 = xmldoc.CreateElement("hphm"); //创建一个<Node>节点 xe2.InnerText = XmlOperation.encodeGBK(hphm); XmlElement xe3 = xmldoc.CreateElement("hpzl"); //创建一个<Node>节点 xe3.InnerText = hpzl; XmlElement xe4 = xmldoc.CreateElement("bm"); //创建一个<Node>节点 xe4.InnerText = "gbk"; xe1.AppendChild(xe2); xe1.AppendChild(xe3); xe1.AppendChild(xe4); root.AppendChild(xe1); string send_xml = XmlOperation.ConvertXmlToStringGBK(xmldoc); IOControl.saveXmlLogInf("GetVehicleInf_Send: Xtlb:" + Xtlb + "|Jkid:18C91|Yhdh:" + Yhdh + "|Jkxh:" + Jkxh + "\r\n" + send_xml + "\r\n"); StringBuilder receiveXml = new StringBuilder(); receiveXml.Length = 10240; gxDll.queryObjectOut(Xtlb, "18C91", send_xml, Yhdh, Jkxh, receiveXml); IOControl.saveXmlLogInf("Received:\r\n" + receiveXml.ToString() + "\r\n"); return(XmlOperation.ReadXmlToDatatable(receiveXml.ToString(), out code, out message)); } catch (Exception er) { IOControl.saveXmlLogInf("GetVehicleInf_Send_Error: \r\n" + er.Message + "\r\n"); return(null); } }