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();