C#读写config配置文件

应用程序配置文件（App.config）是标准的 XML 文件，XML 标记和属性是区分大小写的。它是可以按需要更改的，开发人员可以使用配置文件来更改设置，而不必重编译应用程序。

对于一个config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>

对config配置文件的读写类：

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;        }    }}

测试代码如下：

    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);            }        }    }