C# 如何获取自定义的config中节点的值，并修改节点的值

现定义一个方法 DIYConfigHelper.cs

using System;

using System.Xml;

using System.Configuration;

using System.Reflection;

using System.Web;

using System.IO;

namespace Chain.Common

{

    /// <summary>

    /// Summary description for ReadWriteConfig.

    /// </summary>

    public class DIYConfigHelper

    {

        /// <summary>

        ///

        /// </summary>

        /// <param name="key">节点名称</param>

        /// <returns></returns>

        /// <summary>

        /// 获取自定义 index.config 文件中的 appsetting 节点值

        /// flag -1:配置文件不存在 -2：:节点不存在

        /// </summary>

        /// <param name="path">config文件的路径</param>

        /// <param name="key">节点名称</param>

        /// <returns>节点名称的值</returns>

        public static string GetIndexConfigValue(string path, string key)

        {

            string flag = "";

            string indexConfigPath = path;

            if (string.IsNullOrEmpty(indexConfigPath))

                return flag = "-1";//配置文件为空

            if (!File.Exists(indexConfigPath))

                return flag = "-1";//配置文件不存在

            ExeConfigurationFileMap ecf = new ExeConfigurationFileMap();

            ecf.ExeConfigFilename = indexConfigPath;

            Configuration config = ConfigurationManager.OpenMappedExeConfiguration(ecf, ConfigurationUserLevel.None);

            try

            {

                flag = config.AppSettings.Settings[key].Value;

            }

            catch (Exception)

            {

                flag = "-2";

            }

            return flag;

        }

        /// <summary>

        /// 设置自定义 index.config 文件中的 appsetting 节点值

        /// </summary>

        /// <param name="path">config文件的路径</param>

        /// <param name="key">节点名称</param>

        /// <param name="value">需要修改的值</param>

        /// <returns>true：修改成功 false：修改失败</returns>

        public static bool SetIndexConfigValue(string path, string key, string value)

        {

            string indexConfigPath = path;

            if (string.IsNullOrEmpty(indexConfigPath))

                throw new Exception("请检查应用程序配置文件 appSettings 节点，是否存在 indexConfig 且 value 不为空的配置节！");

            if (!File.Exists(indexConfigPath))

                throw new Exception(string.Format("配置文件不存在：{0}", indexConfigPath));

            ExeConfigurationFileMap ecf = new ExeConfigurationFileMap();

            ecf.ExeConfigFilename = indexConfigPath;

            Configuration config = ConfigurationManager.OpenMappedExeConfiguration(ecf, ConfigurationUserLevel.None);

            config.AppSettings.Settings[key].Value = value;

            config.Save();

            return true;

        }

        /// <summary>

        /// 给xlm指定的节点添加节点和值

        /// </summary>

        /// <param name="path">xml文件的路径</param>

        /// <param name="key">添加的key值</param>

        /// <param name="value">添加的value值</param>

        public static void AddIndexConfigValue(string path, string key, string value)

        {

            XmlDocument xmlDoc = new XmlDocument();

            xmlDoc.Load(path); //加载xml文件

            XmlNode rootXml = xmlDoc.SelectSingleNode("configuration"); //查询XML文件的根节点("siteMapPath")

            XmlNodeList xnl = rootXml.SelectNodes("appSettings"); //获取所有节点为"siteMapNode"的节点

            foreach (XmlNode xnItem in xnl)

            {

                XmlElement xe = (XmlElement)xnItem; //将子节点类型转换为XmlElement类型

                XmlElement newXE = xmlDoc.CreateElement("add");

                newXE.SetAttribute("key", key);

                newXE.SetAttribute(@"value", value);

                xnItem.AppendChild(newXE);

            }

            xmlDoc.Save(path);

        }

        /// <summary>

        /// 按xml路径删除指定节点

        /// </summary>

        /// <param name="path">xml文件路径</param>

        /// <param name="key">要删除的节点key值</param>

        /// <returns>0：删除失败，1:删除成功，-1：配置文件异常，-2系统异常，</returns>

        public static string DeleteIndexConfigValue(string path, string key)

        {

            string flag = "";

            string indexConfigPath = path;

            if (string.IsNullOrEmpty(indexConfigPath))

                return flag = "-1";//配置文件为空

            if (!File.Exists(indexConfigPath))

                return flag = "-1";//配置文件不存在

            ExeConfigurationFileMap ecf = new ExeConfigurationFileMap();

            ecf.ExeConfigFilename = indexConfigPath;

            Configuration config = ConfigurationManager.OpenMappedExeConfiguration(ecf, ConfigurationUserLevel.None);

            try

            {

                config.AppSettings.Settings.Remove(key);

                config.Save(ConfigurationSaveMode.Modified);

                flag = "";

            }

            catch (Exception)

            {

                flag = "-2";//系统异常

            }

            return flag;

        }

    }

}

调用方式：

    string ss = Chain.Common.DIYConfigHelper.GetIndexConfigValue(HttpRuntime.AppDomainAppPath.ToString() + "DIY.config", "");//获取节点值

    bool tt = Chain.Common.DIYConfigHelper.SetIndexConfigValue(HttpRuntime.AppDomainAppPath.ToString() + "DIY.config", "", "");//修改节点值

    Chain.Common.DIYConfigHelper.AddIndexConfigValue(HttpRuntime.AppDomainAppPath.ToString() + "DIY.config", "", "");//添加节点和值

    string mm=Chain.Common.DIYConfigHelper.DeleteIndexConfigValue(HttpRuntime.AppDomainAppPath.ToString() + "DIY.config", "14");//删除指定值的节点

DIY.config文件的内容

<?xml version="1.0" encoding="utf-8"?>

<configuration>

  <appSettings>

     <add key="" value="663CFB4AF7AE2A91B14587C31B3DE60AF38AED2E63F5040C5D453CBC704162B8ACDD7A7D67A95FA0" />

    <add key="" value="156D7DB054ABBF9B321B1E8982130FDA3420475BC524C4259C55A8CEA4F884DE649FD16284A1053F" />

  </appSettings>

  <connectionStrings />

</configuration>