怎么通过Configuration 类编辑配置文件

代码如下:

        //编辑web.config文件

        //打开配置文件
        Configuration   config   =   System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration( "~ ");
        //获取appsettings节点
        AppSettingsSection   appsection   =   (AppSettingsSection)config.GetSection( "appSettings ");
        //在appsettings节点中添加元素
        appsection.Settings.Add( "addkey1 ",   "key1 's   value ");
        appsection.Settings.Add( "addkey2 ",   "key2 's   value ");
        config.Save();

        //删除节点或属性
        //打开配置文件
        Configuration   config   =   System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration( "~ ");
        //获取appsettings节点
        AppSettingsSection   appsection   =   (AppSettingsSection)config.GetSection( "appSettings ");
        //删除appsettings节点中的元素
        appsection.Settings.Remove( "addkey1 ");
        //修改appsettings节点中的元素
        appsection.Settings[ "addkey2 "].Value   =   "modify   key2 's   value ";
        config.Save();

        ////////////////////////////////////////////////////////////////////////

        //编辑App.config文件

        ExeConfigurationFileMap   file   =   new   ExeConfigurationFileMap();
        file.ExeConfigFilename   =   @ "..\..\test.config ";
        //打开配置文件
        Configuration   myConfig   =   System.Configuration.ConfigurationManager.OpenMappedExeConfiguration(file,   ConfigurationUserLevel.None);
        //获取appsettings节点
        AppSettingsSection   appsection   =   (AppSettingsSection)myConfig.GetSection( "appSettings ");
        //在appsettings节点中添加元素
        appsection.Settings.Add( "addkey1 ",   "key1 's   value ");
        appsection.Settings.Add( "addkey2 ",   "key2 's   value ");
        config.Save();

        //删除节点或属性
        //打开配置文件
        ExeConfigurationFileMap   file   =   new   ExeConfigurationFileMap();
        file.ExeConfigFilename   =   @ "..\..\test.config ";
        //打开配置文件
        Configuration   myConfig   =   System.Configuration.ConfigurationManager.OpenMappedExeConfiguration(file,   ConfigurationUserLevel.None);
        //获取appsettings节点
        AppSettingsSection   appsection   =   (AppSettingsSection)myConfig.GetSection( "appSettings ");
        //删除appsettings节点中的元素
        appsection.Settings.Remove( "addkey1 ");
        //修改appsettings节点中的元素
        appsection.Settings[ "addkey2 "].Value   =   "modify   key2 's   value ";
        myConfig.Save();