利用linq实现日统计

一时失言乱红尘 2022-10-09 14:26 121阅读 0赞

场景描述：

用户在每天都有会N条记录，现在要实现每天有个统计信息，相当外层显示日统计信息，第二层显示每日明细数据。

代码如下：

/// <summary>
            /// 30天内用户的**统计及日明细
            /// </summary>
            /// <param name="userId"></param>
            /// <returns></returns>
            public static List<DtoSitDayCountInfo> ListSitInfoFor30Days(int userId)
            {
                var listResut = new List<DtoSitDayCountInfo>();
                try
                {
                    var list = SitInMeditationDal.ListSitInfoFor30Days(userId);
                    if(list!=null)
                    {
                        var groupDay = from listday in list
                                       group listday by new { curDate = listday.EndTime.ToShortDateString() } into g
                                       select new DtoSitDayCountInfo
                                       {
                                           CurDate = g.Key.curDate,
                                           TotalDuration = g.Sum(p => p.Duration),
                                           TotalTimes = g.Count(),
                                           MaxDuration = g.Max(p=>p.Duration),
                                           AvgDuration = g.Average(p=>p.Duration).ToInt32(),
                                       };
                        if (groupDay != null)
                        {
                            listResut = groupDay.ToList();
    
                            foreach (var item in listResut)
                            {
                                item.ListDay = list.FindAll(p => p.EndTime.ToShortDateString() == item.CurDate); 
                            }
                        }
                    }
                }
                catch (Exception e)
                {
                    Log.Error(e.Message + e.StackTrace);
                }
                return listResut;
            }

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