读取XML类 (XmlHelper)

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

namespace System.Bwch.XmlConfig
{
    /**//// <summary>
    /// 读取XML配置文件类
    /// </summary>
    public class XmlHelper
    {
        private string strXmlPath = "";   //Xml文档路径
        private XmlDocument xmlDoc;   //XML文档

        /**//// <summary>
        /// 初始化ReadXml类
        /// </summary>
        /// <param name="XMLPath">XML文件路径</param>
        public XmlHelper(string XMLPath)
        {
            if (!System.IO.File.Exists(XMLPath))
            {

                throw new Exception("没有找到指定的路径：" + XMLPath + "的XML文档");
            }

            strXmlPath = XMLPath;
            xmlDoc = new XmlDocument();
            xmlDoc.Load(XMLPath);
        }

        /**//// <summary>
        /// 读取XML文件指定键值的value值  
        /// </summary>
        /// <param name="XMLNodePath">键值的路径,格式为(根节点/节点/子节点)</param>
        /// <param name="valueName">指定键值的属性名称</param>
        /// <returns>value值</returns>
        public string ReadXmlValue(string XMLNodePath,string valueName)
        {
           try
            {
                XmlElement xml = (XmlElement)xmlDoc.SelectSingleNode(XMLNodePath);  
                return xml.GetAttribute(valueName);
            }
            catch (Exception ex)
            {
               throw new Exception(ex.Message);
            }
        }

        /**//// <summary>
        /// 写XML指定节点的
        /// </summary>
        /// <param name="XmlNodePath">键值路径，格式为((根节点/节点/子节点))</param>
        /// <param name="valueName">属性名称</param>
        /// <param name="Value">属性</param>
        /// <returns></returns>
        public bool WriteXmlValue(string XmlNodePath,string valueName, string Value)
        {
            try
            {
                XmlElement xml = (XmlElement)xmlDoc.SelectSingleNode(XmlNodePath);
                xml.SetAttribute(valueName, Value);   //设置
                xmlDoc.Save(strXmlPath);     //保存
                return true;
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        /**//// <summary>
        /// 读取XML键值
                /// </summary>
        /// <param name="XmlNodePath">键值路径，格式为((根节点/节点/子节点))</param>
        /// <returns></returns>
        public string ReadXmlKey(string XmlNodePath)
        {
            try
            {
                XmlElement xml = (XmlElement)xmlDoc.SelectSingleNode(XmlNodePath);
                return xml.InnerText;
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        /**//// <summary>
        /// 写XML键值
                /// </summary>
        /// <param name="XmlNodePath">键值路径，格式为((根节点/节点/子节点))</param>
        /// <param name="Value">值</param>
        /// <returns></returns>
        public bool WriteXmlKey(string XmlNodePath, string Value)
        {
            try
            {
                XmlElement xml = (XmlElement)xmlDoc.SelectSingleNode(XmlNodePath);
                xml.InnerText=Value;
                xmlDoc.Save(strXmlPath);
                return true;
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }
    }
}