/// <summary>
        /// 收到 "好友統計資料" 後會回覆的文字
        /// </summary>
        /// <returns></returns>
        private async Task <string> GetFriendDemographicsTips()
        {
            string result = "";
            FriendDemographicsResponseModel responseModel = new FriendDemographicsResponseModel();

            responseModel = await _lineClient.GetFriendDemographicsAsync();

            if (responseModel.available == true)
            {
                StringBuilder stringBuilder = new StringBuilder();
                stringBuilder.Append("好友統計資料:");

                stringBuilder.Append("\r\n性別相關:");
                foreach (var q in responseModel.genders)
                {
                    stringBuilder.Append("\r\n性別:" + q.gender)
                    .Append("\r\n比例:" + q.percentage);
                }

                stringBuilder.Append("\r\n年齡相關:");
                foreach (var q in responseModel.ages)
                {
                    stringBuilder.Append("\r\n年齡層:" + q.age)
                    .Append("\r\n比例:" + q.percentage);
                }

                stringBuilder.Append("\r\n地區相關:");
                foreach (var q in responseModel.areas)
                {
                    stringBuilder.Append("\r\n地區:" + q.area)
                    .Append("\r\n比例:" + q.percentage);
                }

                stringBuilder.Append("\r\n操作系統相關:");
                foreach (var q in responseModel.appTypes)
                {
                    stringBuilder.Append("\r\n操作系統:" + q.appType)
                    .Append("\r\n比例:" + q.percentage);
                }

                stringBuilder.Append("\r\n加入好友年資相關:");
                foreach (var q in responseModel.subscriptionPeriods)
                {
                    stringBuilder.Append("\r\n年資:" + q.subscriptionPeriod)
                    .Append("\r\n比例:" + q.percentage);
                }

                result = stringBuilder.ToString();
            }
            else
            {
                result = "暫時無法查詢";
            }

            return(result);
        }