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); } } }
本文转自阿凡卢博客园博客，原文链接：http://www.cnblogs.com/luxiaoxun/p/3599341.html，如需转载请自行联系原作者
