/// <summary>

        /// 保存appSetting

        /// </summary>

        /// <param name="key">appSetting的KEY值</param>

        /// <param name="value">appSetting的Value值</param>

        private static void SetAppSetting(string key, string value)

        {

            // 创建配置文件对象

            System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

            if (config.AppSettings.Settings[key] != null)

            {

                // 修改

                config.AppSettings.Settings[key].Value = value;

            }

            else

            {

                // 添加

                AppSettingsSection ass = (AppSettingsSection)config.GetSection("appSettings");

                ass.Settings.Add(key, value);

            }

            // 保存修改

            config.Save(ConfigurationSaveMode.Modified);

            // 强制重新载入配置文件的连接配置节

            ConfigurationManager.RefreshSection("appSettings");

        }