优化从 App.config 读取配置文件

    public class AppSettingsConfig
    {
        /// <summary>
        ////// </summary>
        public static int QueryKeyCodeUserInfoTimespan => Convert.ToInt32(AppSettingValue());

        /// <summary>
        ////// </summary>
        public static int WriteKeyCodeUserInfoTimespan => Convert.ToInt32(AppSettingValue());

        /// <summary>
        ////// </summary>
        public static int UserIdCount => Convert.ToInt32(AppSettingValue());

        private static string AppSettingValue([CallerMemberName] string key = null)
        {
            return ConfigurationManager.AppSettings[key];
        }
    }