public class XmlReadWrite
    {
        static string filePath = Environment.CurrentDirectory + "\\config.xml";

        private static XmlElement Init(ref XmlDocument doc)
        {
            XmlElement root;
            if (File.Exists(filePath))
            {
                // 参数存在，加载XML
                doc.Load(filePath);
                // 获得根节点
                root = doc.DocumentElement;
            }
            else
            {
                // 参数不存在，创建xml文档第一行
                XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "utf-8", null);
                doc.AppendChild(dec);
                // 创建根节点
                root = doc.CreateElement("root");
                doc.AppendChild(root);
            }

            return root;
        }
        /// <summary>
        /// 系统配置文件读操作
        /// </summary>
        /// <param name="systemConfig"></param>
        /// <param name="msg"></param>
        public static string ReadConfig<T>(T t)
        {
            XmlDocument doc = new XmlDocument();
            XmlElement root = Init(ref doc);
            string msg = string.Empty;
            try
            {
                PropertyInfo[] PropertyList = t.GetType().GetProperties();
                foreach (PropertyInfo item in PropertyList)
                {
                    XmlNode xn = root.SelectSingleNode(item.Name);
                    if (xn != null)
                    {
                        if (xn.InnerText.Trim() == "")
                            msg = "节点" + item.Name + "没有值！";
                        else
                            item.SetValue(t, xn.InnerText.Trim());
                    }
                    else
                        msg = "节点" + item.Name + "不存在！";
                }
                return msg;
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }

        /// <summary>
        /// 系统配置文件写操作
        /// </summary>
        /// <param name="systemConfig"></param>
        /// <param name="msg"></param>
        /// <returns></returns>
        public static string WriteConfig<T>(T t)
        {
            XmlDocument doc = new XmlDocument();
            XmlElement root = Init(ref doc);
            string msg = string.Empty;
            try
            {
                PropertyInfo[] PropertyList = t.GetType().GetProperties();
                foreach (PropertyInfo item in PropertyList)
                {
                    XmlNode xn = root.SelectSingleNode(item.Name);
                    if (xn != null)
                        xn.InnerText = item.GetValue(t, null).ToString();
                    else
                    {
                        xn = doc.CreateElement(item.Name);
                        xn.InnerText = item.GetValue(t, null).ToString();
                        root.AppendChild(xn);
                    }
                }
                doc.Save(filePath);
                return msg;
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }
    }