读取xml文件帮助类

1.XML帮助类

   public class XmlHelper
    {
        public static string GetElementByName(string xmlFileName, string tagName)
        {
            try
            {
                string result = null;
                XmlDocument doc = new XmlDocument();
                doc.Load(xmlFileName);
                XmlNodeList nodes = doc.GetElementsByTagName(tagName);
                foreach (XmlNode v in nodes)
                {
                    result = v.InnerText;
                }
                return result;
            }
            catch
            {
                throw new Exception("打开文件错误");
            }
        }

2.应用

    SerialPort sport = new SerialPort();
                                    if (sport.IsOpen == false)
                                    {
                                        string appPath = AppDomain.CurrentDomain.BaseDirectory;
                                        string sIniFile = appPath + "wmsconfig" + "\\" + "CardSetting.xml";
                                        if (File.Exists(sIniFile))
                                        {
                                            sport.BaudRate = Convert.ToInt32(XmlHelper.GetElementByName(sIniFile, "BaudRate"));
                                            sport.DataBits = Convert.ToInt32(XmlHelper.GetElementByName(sIniFile, "DataBits"));
                                            sport.StopBits = (StopBits)Convert.ToInt32(XmlHelper.GetElementByName(sIniFile, "StopBits"));
                                            sport.Parity = (Parity)Convert.ToInt32(XmlHelper.GetElementByName(sIniFile, "Parity"));
                                            var portName = XmlHelper.GetElementByName(sIniFile, "PortName");
                                            if (null != portName)
                                                sport.PortName = portName;
                                        }
                                        sport.BaudRate = 9600;
                                        sport.DataBits = 8;
                                        sport.StopBits = StopBits.One;
                                        sport.Parity = Parity.None;
                                        try
                                        {
                                            sport.Open();//打开串口
                                            sport.DtrEnable = true;//设置DTR为高电平
                                            sport.RtsEnable = true;//设置RTS位高电平               
                                        }
                                        catch (Exception ex)
                                        {
                                            //MessageBox.Show(ex.Message);
                                        }