c# 读写xml 操作类

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;

namespace KeyCalc
{
    class XmlClass
    {
        /// <summary>
        /// 配置文件路径
        /// </summary>
        private string xmlFilePath; 
        /// <summary>  
        /// 皮肤索引　  
        /// </summary>  
        public string skinIndex; 
        /// <summary>  
        /// 皮肤路径  
        /// </summary>  
        public string skinPath; 
 
        public XmlClass() 
        { 
            //指定XML文件名  
            xmlFilePath = "config.xml"; 
            //检测XML配置文件是否存在  
            if (System.IO.File.Exists(xmlFilePath)) 
                return; 
            CreateDefaultXml(); 
        }
 
        #region " ReadXML() 读取XML配置文件的参数设置，获取下载的TXT文件路径与上传的数据文件路径"  
        /// <summary>  
        /// 读取XML配置文件的参数设置，获取下载的TXT文件路径与上传的数据文件路径  
        /// </summary>  
        /// <returns></returns>  
        public bool ReadXML() 
        { 
            try 
            { 
                XmlDocument xmlDoc=new XmlDocument(); 
                //读取XML配置文件  
                xmlDoc.Load(xmlFilePath); 
 
                //读取XML文件节点  
                XmlNode rootNode = xmlDoc.SelectSingleNode("Skin").SelectSingleNode("ParameterSet"); 
                if ( rootNode==null ) 
                    throw( new Exception("XML配置文件信息异常")); 
 
                //获取XML文件参数设置下的节点值  
                XmlElement downfile = (XmlElement)(rootNode.SelectSingleNode("SkinIndex")); 
                if (downfile == null) 
                    throw (new Exception("XML配置文件信息异常")); 
                skinIndex = downfile.InnerText; 
                XmlElement uploadfile = (XmlElement)(rootNode.SelectSingleNode("SkinPath")); 
                if (uploadfile == null) 
                    throw (new Exception("XML配置文件信息异常")); 
                skinPath = uploadfile.InnerText; 
 
                return true; 
            } 
            catch (System.Exception e) 
            { 
                throw (e); 
            } 
        } 
        #endregion 
 
 
        #region " WriteXML() 写XML配置文件的参数设置，保存下载的TXT文件路径与上传的数据文件路径"  
        /// <summary>  
        /// 写XML配置文件的参数设置，保存下载的TXT文件路径与上传的数据文件路径  
        /// </summary>  
        /// <returns></returns>  
        public bool WriteXML() 
        { 
            try 
            { 
                XmlDocument xmlDoc = new XmlDocument(); 
                //读取XML配置文件  
                xmlDoc.Load(xmlFilePath); 
 
                //读取XML文件节点  
                XmlNode rootNode = xmlDoc.SelectSingleNode("Skin").SelectSingleNode("ParameterSet"); 
                if (rootNode == null) 
                    throw (new Exception("XML配置文件信息异常")); 
                 
                //设置XML文件节点的值  
                XmlElement skinIndexs = (XmlElement)(rootNode.SelectSingleNode("SkinIndex"));
                if (skinIndexs == null) 
                    throw (new Exception("XML配置文件信息异常"));
                skinIndexs.InnerText = skinIndex;
                XmlElement skinPaths = (XmlElement)(rootNode.SelectSingleNode("SkinPath"));
                if (skinPaths == null) 
                    throw (new Exception("XML配置文件信息异常"));
                skinPaths.InnerText = skinPath; 
 
                //保存XML文件  
                xmlDoc.Save(xmlFilePath); 
                 
                return true; 
            } 
            catch (System.Exception ex) 
            { 
                throw (ex); 
            } 
        } 
        #endregion 
 
        #region " CreateDefaultXml() 创建一个默认的XML配置文件"  
        /// <summary>  
        /// 创建一个默认的XML配置文件  
        /// </summary>  
        private void CreateDefaultXml() 
        { 
            try 
            { 
                XmlDocument xmlDoc = new XmlDocument(); 
                //创建XML文件描述  
                XmlDeclaration dec = xmlDoc.CreateXmlDeclaration("1.0", "GB2312", null); 
                xmlDoc.AppendChild(dec); 
                //创建根元素  
                XmlNode root = xmlDoc.CreateNode(XmlNodeType.Element, "Skin", ""); 
                xmlDoc.AppendChild(root); 
 
                //添加参数设置节点  
                XmlNode parConfig = xmlDoc.CreateNode(XmlNodeType.Element, "ParameterSet", ""); 
                root.AppendChild(parConfig); 
 
                //添加下载到PDA的TXT文件路径  
                XmlElement skinIndexs = xmlDoc.CreateElement("SkinIndex");
                skinIndexs.InnerText = "";
                parConfig.AppendChild(skinIndexs); 
                //添加PDA数据文件上传到PC端的文件路径  
                XmlElement skinPaths = xmlDoc.CreateElement("SkinPath");
                skinPaths.InnerText = "";
                parConfig.AppendChild(skinPaths); 
 
                //保存xml文件  
                xmlDoc.Save(xmlFilePath);  
            } 
            catch (System.Exception ex) 
            { 
                throw ( new Exception("创建默认XML文件失败"+ex.Message)); 
            } 
        } 
        #endregion  

    }
}