获取时间间隔方法

	/// <summary>
        /// 获取时间间隔
        /// </summary>
        /// <param name="dateTime">开始时间</param>
        /// <param name="type">返回类型（1：毫秒 2：秒 3：分 4:小时 5：天）</param>
        /// <returns>返回时间间隔</returns>
        public static string GetTimeStamp(DateTime dateTime,int type = 1)
        {
            string result = "";
            TimeSpan ts = DateTime.Now - dateTime;
            switch(type)
            {
                case 1:
                    result =  Convert.ToInt64(ts.TotalMilliseconds).ToString();
                    break;
                case 2:
                    result =  Convert.ToInt64(ts.TotalSeconds).ToString();
                    break;
                case 3:
                    result =  Convert.ToInt64(ts.TotalMinutes).ToString();
                    break;
                case 4:
                    result = Convert.ToInt64(ts.TotalHours).ToString();
                    break;
                case 5:
                    result = Convert.ToInt64(ts.TotalDays).ToString();
                    break;
                default:
                    result =  Convert.ToInt64(ts.TotalMilliseconds).ToString();
                    break;
            }
            return result;
        }