一个操作XML文件的类。。部份功能在完善中~~~~

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
/*
 * 作者 By感觉De味道;
 * 版板 SghComm1.0
 * 联系方式:ZhouFLeru@hotmail.com
 */
namespace TextCom
{
    class SettingXml
    {
        private static System.Xml.XmlDocument xDoc = null;//加载配置文件用到;
        //生成配置文件;
        public static void NewSeeting()
        {
            string[] addkey ={ "Port", "BaudRate", "DataBits", "Parity", "StopBits" };
            string[] addvalue ={ "1", "38400", "8", "0", "1" };
            XmlDocument xmldoc;//XMl文档
            XmlNode xmlnode;//XMl 中的节点
            XmlElement xmlelem; //XML中元素
             xmldoc = new XmlDocument();
            XmlDeclaration xmlDec = xmldoc.CreateXmlDeclaration("1.0", "gb2312", null);
            //加入XML的声明段落
            xmlnode = xmldoc.CreateNode(XmlNodeType.XmlDeclaration, "", "");
            xmldoc.AppendChild(xmlnode);
            //加入一个根元素
            xmlelem = xmldoc.CreateElement("", "configuration", "");
            xmldoc.AppendChild(xmlelem);
            //加入另外一个元素
            for (int i = 0; i < 5; i++)
            {
                XmlNode root = xmldoc.SelectSingleNode("configuration");//查找<configuration>
                XmlElement xe1 = xmldoc.CreateElement("add");//创建一个<add>节点
                xe1.SetAttribute("key", addkey[i] + "");
                xe1.SetAttribute("value", addvalue[i] + "");
                root.AppendChild(xe1);//添加到<configuration>节点中
            }
            //保存创建好的XML文档
            xmldoc.Save("setting.config");
        }
        //Load配置文件;
        public static string LoadSettingXml(string Appkey)
        {
            string path = "";
            XmlNode LNode;
            XmlElement LElem;

            try {
                path = "setting.config";
           
            if (xDoc==null)
            {
                xDoc=new System.Xml.XmlDocument();
                xDoc.Load(path);
            }
        }catch{throw new Exception("未发现配置文件!");}
            try{