public class ConfigureAppConfig{    //静态构造,不能实例化    static ConfigureAppConfig() { }     /**//// 
    /// 获取AppSettings配置节中的Key值    /// 
    /// Key's name    /// 
         
          Key's value
             public static string GetAppSettingsKeyValue(string keyName)    {        return ConfigurationManager.AppSettings.Get(keyName);    }     /**//// 
    /// 获取ConnectionStrings配置节中的值    /// 
    /// 
             public static string GetConnectionStringsElementValue()    {        ConnectionStringSettings settings = System.Configuration.ConfigurationManager.ConnectionStrings["connectionString"];        return settings.ConnectionString;    }     /**//// 
    /// 保存节点中ConnectionStrings的子节点配置项的值    /// 
    ///     public static void ConnectionStringsSave(string ConnectionStringsName, string elementValue)    {        System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);        config.ConnectionStrings.ConnectionStrings["connectionString"].ConnectionString = elementValue;        config.Save(ConfigurationSaveMode.Modified);        ConfigurationManager.RefreshSection("connectionStrings");    }     /**//// 
    /// 判断appSettings中是否有此项    /// 
    private static bool AppSettingsKeyExists(string strKey, Configuration config)    {        foreach (string str in config.AppSettings.Settings.AllKeys)        {            if (str == strKey)            {                return true;            }        }        return false;    }     /**//// 
    /// 保存appSettings中某key的value值    /// 
    /// key's name    /// value    public static void AppSettingsSave(string strKey, string newValue)    {        System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);        if (AppSettingsKeyExists(strKey, config))        {            config.AppSettings.Settings[strKey].Value = newValue;            config.Save(ConfigurationSaveMode.Modified);            ConfigurationManager.RefreshSection("appSettings");        }    }}

 

如果你的程序是对其它程序的配置文件进行操作,代码如下：

ExeConfigurationFileMap filemap = new ExeConfigurationFileMap();filemap.ExeConfigFilename = filePath;//配置文件路径config = ConfigurationManager.OpenMappedExeConfiguration(filemap, ConfigurationUserLevel.None); if (AppSettingsKeyExists("Refresh", config)){    config.AppSettings.Settings["Refresh"].Value = M_TimeRead.ToString();} if (AppSettingsKeyExists("MachineNo", config)){    config.AppSettings.Settings["MachineNo"].Value = M_MachineNo; }config.Save(ConfigurationSaveMode.Modified);ConfigurationManager.RefreshSection("appSettings"); config.ConnectionStrings.ConnectionStrings["connectionString"].ConnectionString = M_ConnectionString;config.Save(ConfigurationSaveMode.Modified);ConfigurationManager.RefreshSection("connectionStrings");

 

 

数据库字符串加密

ExeConfigurationFileMap filemap = new ExeConfigurationFileMap();filemap.ExeConfigFilename = Application.ExecutablePath + ".Config"; //filePath;config = ConfigurationManager.OpenMappedExeConfiguration(filemap, ConfigurationUserLevel.None);//指定我所要的节点ConfigurationSection section = config.ConnectionStrings; if ((section.SectionInformation.IsProtected == false) && (section.ElementInformation.IsLocked == false)){    //制定节点加密    section.SectionInformation.ProtectSection(protect);    //即使没有修改也保存设置    section.SectionInformation.ForceSave = true;    //配置文件内容保存到xml    config.Save(ConfigurationSaveMode.Full);}