Xml文件读写

xml文件：

<ModbusConfig>
  <Module Id="0001" Name="1#变频器" Description="1#变频器">
    <DataPoint Id="00001" StartingRegister="2000" DataType="U16" DataPointType="0" Name="1#变频器启动/1#变频器停机" Description="数字量点" />
    <DataPoint Id="00002" StartingRegister="2001" DataType="U16" DataPointType="0" Name="1#变频器报警" Description="数字量点" />
    <DataPoint Id="00003" StartingRegister="0010" DataType="U16" DataPointType="0" Name="变频器输出频率" Description="监控参数" />
    <DataPoint Id="00004" StartingRegister="0011" DataType="U16" DataPointType="0" Name="变频器输出电流" Description="监控参数" />
    <DataPoint Id="00005" StartingRegister="0012" DataType="U16" DataPointType="0" Name="输出转速" Description="监控参数" />
    <DataPoint Id="00006" StartingRegister="0013" DataType="U16" DataPointType="0" Name="输出力矩" Description="监控参数" />
    <DataPoint Id="00007" StartingRegister="0014" DataType="U16" DataPointType="0" Name="电机功率" Description="监控参数" />
    <DataPoint Id="00008" StartingRegister="0015" DataType="U32" DataPointType="0" Name="电机运行时间" Description="监控参数" />
    <DataPoint Id="00009" StartingRegister="0017" DataType="U16" DataPointType="0" Name="出气口压力" Description="监控参数" />
  </Module>
  <Module Name="2#变频器" Description="2#变频器" Id="0002">
    <DataPoint Id="00010" StartingRegister="2002" DataType="U16" DataPointType="0" Name="2#变频器启动/2#变频器停机" Description="数字量点" />
    <DataPoint Id="00010" StartingRegister="2002" DataType="U16" DataPointType="0" Name="2#变频器启动/2#变频器停机" Description="数字量点" />
  </Module>
</ModbusConfig>

读写：

private void ReadConfigFile()
        {
            string modbusConfigRelativePath = ApplicationSettingsFactory.GetApplicationSettings().ModbusConfigFilePath;
            string modbusConfigFile = System.IO.Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory,
                                                             modbusConfigRelativePath);

            if (System.IO.File.Exists(modbusConfigFile))
            {
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(modbusConfigFile);

                XmlNodeList moduleNodes = xmlDoc.SelectNodes("/ModbusConfig/Module");
                if (null != moduleNodes && moduleNodes.Count > 0)
                {
                    ClearDictionary();
                    int moduleId = 0;
                    int dataPointId = 0;

                    foreach (XmlNode moduleNode in moduleNodes)
                    {
                        // Module
                        moduleId++;
                        XmlElement moduleElement = (XmlElement) moduleNode;
                        string moduleNumber = Convert.ToString(moduleId);
                        moduleElement.SetAttribute("Id", string.Format("{0:D4}", moduleId));

                        string moduleName = moduleElement.GetAttribute("Name");
                        string moduleDescription = moduleElement.GetAttribute("Description");

                        Module module = new Module();

                        //UnitOfWork机制和数据库外键的设计，决定了要预先设置数据库中的主键Id
                        //尽管数据库自己生产主键。
                        module.Id = moduleId;

                        AddModule(module,
                                  moduleNumber,
                                  moduleName,
                                  moduleDescription);

                        //DataPoint
                        XmlNodeList dataPointNodes = moduleNode.ChildNodes;
                        if (dataPointNodes.Count > 0)
                        {
                            foreach (XmlNode dataPointNode in dataPointNodes)
                            {
                                dataPointId++;
                                XmlElement dataPointElement = (XmlElement) dataPointNode;

                                string dataPointNumber = Convert.ToString(dataPointId);
                                dataPointElement.SetAttribute("Id", string.Format("{0:D5}", dataPointId));

                                string dataPointName = dataPointElement.GetAttribute("Name");
                                string dataPointStartingRegister = dataPointElement.GetAttribute("StartingRegister");
                                string dataPointDataType = dataPointElement.GetAttribute("DataType");
                                string dataDataDataPointType = dataPointElement.GetAttribute("DataPointType");
                                string datapointDescription = dataPointElement.GetAttribute("Description");

                                DataPoint dataPoint = new DataPoint();

                                //UnitOfWork机制和数据库外键的设计，决定了要预先设置数据库中的主键Id
                                //尽管数据库自己生产主键。
                                dataPoint.Id = dataPointId;

                                AddDataPoint(module,
                                             dataPoint,
                                             dataPointNumber,
                                             dataPointStartingRegister,
                                             dataPointName,
                                             dataPointDataType,
                                             dataDataDataPointType,
                                             datapointDescription);
                            }
                        }
                    }

                    xmlDoc.Save(modbusConfigFile);
                }
            }
        }