详解C#如何读写config配置文件

<?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);   }  } }