C#读写config配置文件的方法

<?xml version="1.0" encoding="utf-8" ?><configuration> <appSettings>  <add key="ServerIP" value="127.0.0.1"></add>  <add key="DataBase" value="WarehouseDB"></add>  <add key="user" value="sa"></add>  <add key="password" value="sa"></add> </appSettings></configuration>

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Text.RegularExpressions;using System.Configuration;using System.ServiceModel;using System.ServiceModel.Configuration;namespace NetUtilityLib{  public static class ConfigHelper  {    //依据连接串名字connectionName返回数据连接字符串     public static string GetConnectionStringsConfig(string connectionName)    {      //指定config文件读取      string file = System.Windows.Forms.Application.ExecutablePath;      System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(file);      string connectionString =        config.ConnectionStrings.ConnectionStrings[connectionName].ConnectionString.ToString();      return connectionString;    }    ///<summary>     ///更新连接字符串     ///</summary>     ///<param name="newName">连接字符串名称</param>     ///<param name="newConString">连接字符串内容</param>     ///<param name="newProviderName">数据提供程序名称</param>     public static void UpdateConnectionStringsConfig(string newName, string newConString, string newProviderName)    {      //指定config文件读取      string file = System.Windows.Forms.Application.ExecutablePath;      Configuration config = ConfigurationManager.OpenExeConfiguration(file);      bool exist = false; //记录该连接串是否已经存在       //如果要更改的连接串已经存在       if (config.ConnectionStrings.ConnectionStrings[newName] != null)      {        exist = true;      }      // 如果连接串已存在，首先删除它       if (exist)      {        config.ConnectionStrings.ConnectionStrings.Remove(newName);      }      //新建一个连接字符串实例       ConnectionStringSettings mySettings =        new ConnectionStringSettings(newName, newConString, newProviderName);      // 将新的连接串添加到配置文件中.       config.ConnectionStrings.ConnectionStrings.Add(mySettings);      // 保存对配置文件所作的更改       config.Save(ConfigurationSaveMode.Modified);      // 强制重新载入配置文件的ConnectionStrings配置节       ConfigurationManager.RefreshSection("ConnectionStrings");    }    ///<summary>     ///返回*.exe.config文件中appSettings配置节的value项     ///</summary>     ///<param name="strKey"></param>     ///<returns></returns>     public static string GetAppConfig(string strKey)    {      string file = System.Windows.Forms.Application.ExecutablePath;      Configuration config = ConfigurationManager.OpenExeConfiguration(file);      foreach (string key in config.AppSettings.Settings.AllKeys)      {        if (key == strKey)        {          return config.AppSettings.Settings[strKey].Value.ToString();        }      }      return null;    }    ///<summary>     ///在*.exe.config文件中appSettings配置节增加一对键值对     ///</summary>     ///<param name="newKey"></param>     ///<param name="newValue"></param>     public static void UpdateAppConfig(string newKey, string newValue)    {      string file = System.Windows.Forms.Application.ExecutablePath;      Configuration config = ConfigurationManager.OpenExeConfiguration(file);      bool exist = false;      foreach (string key in config.AppSettings.Settings.AllKeys)      {        if (key == newKey)        {          exist = true;        }      }      if (exist)      {        config.AppSettings.Settings.Remove(newKey);      }      config.AppSettings.Settings.Add(newKey, newValue);      config.Save(ConfigurationSaveMode.Modified);      ConfigurationManager.RefreshSection("appSettings");    }    // 修改system.serviceModel下所有服务终结点的IP地址    public static void UpdateServiceModelConfig(string configPath, string serverIP)    {      Configuration config = ConfigurationManager.OpenExeConfiguration(configPath);      ConfigurationSectionGroup sec = config.SectionGroups["system.serviceModel"];      ServiceModelSectionGroup serviceModelSectionGroup = sec as ServiceModelSectionGroup;      ClientSection clientSection = serviceModelSectionGroup.Client;      foreach (ChannelEndpointElement item in clientSection.Endpoints)      {        string pattern = @"/b/d{1,3}/./d{1,3}/./d{1,3}/./d{1,3}/b";        string address = item.Address.ToString();        string replacement = string.Format("{0}", serverIP);        address = Regex.Replace(address, pattern, replacement);        item.Address = new Uri(address);      }      config.Save(ConfigurationSaveMode.Modified);      ConfigurationManager.RefreshSection("system.serviceModel");    }    // 修改applicationSettings中App.Properties.Settings中服务的IP地址    public static void UpdateConfig(string configPath, string serverIP)    {      Configuration config = ConfigurationManager.OpenExeConfiguration(configPath);      ConfigurationSectionGroup sec = config.SectionGroups["applicationSettings"];      ConfigurationSection configSection = sec.Sections["DataService.Properties.Settings"];      ClientSettingsSection clientSettingsSection = configSection as ClientSettingsSection;      if (clientSettingsSection != null)      {        SettingElement element1 = clientSettingsSection.Settings.Get("DataService_SystemManagerWS_SystemManagerWS");        if (element1 != null)        {          clientSettingsSection.Settings.Remove(element1);          string oldValue = element1.Value.ValueXml.InnerXml;          element1.Value.ValueXml.InnerXml = GetNewIP(oldValue, serverIP);          clientSettingsSection.Settings.Add(element1);        }        SettingElement element2 = clientSettingsSection.Settings.Get("DataService_EquipManagerWS_EquipManagerWS");        if (element2 != null)        {          clientSettingsSection.Settings.Remove(element2);          string oldValue = element2.Value.ValueXml.InnerXml;          element2.Value.ValueXml.InnerXml = GetNewIP(oldValue, serverIP);          clientSettingsSection.Settings.Add(element2);        }      }      config.Save(ConfigurationSaveMode.Modified);      ConfigurationManager.RefreshSection("applicationSettings");    }    private static string GetNewIP(string oldValue, string serverIP)    {      string pattern = @"/b/d{1,3}/./d{1,3}/./d{1,3}/./d{1,3}/b";      string replacement = string.Format("{0}", serverIP);      string newvalue = Regex.Replace(oldValue, pattern, replacement);      return newvalue;    }  }}

class Program  {    static void Main(string[] args)    {      try      {        //string file = System.Windows.Forms.Application.ExecutablePath + ".config";        //string file1 = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;        string serverIP = ConfigHelper.GetAppConfig("ServerIP");        string db = ConfigHelper.GetAppConfig("DataBase");        string user = ConfigHelper.GetAppConfig("user");        string password = ConfigHelper.GetAppConfig("password");        Console.WriteLine(serverIP);        Console.WriteLine(db);        Console.WriteLine(user);        Console.WriteLine(password);        ConfigHelper.UpdateAppConfig("ServerIP", "192.168.1.11");        string newIP = ConfigHelper.GetAppConfig("ServerIP");        Console.WriteLine(newIP);        Console.ReadKey();      }      catch (Exception ex)      {        Console.WriteLine(ex.Message);      }    }  }