CreationTime是DateTime类型
group by 年/月/日/小时
group by 年
(from d in YourData.OrderBy(x => x.CreationTime)
group d by new
{
time = new { d.CreationTime.Year }
} into g
select new
{
AverageValue = g.Average(p => p.Value),
CreationTimeStr = g.Key.time.Year,
MaxValue = g.Max(x => x.Value),
MinValue = g.Min(x => x.Value)
}).ToList();
group by 小时
(from d in YourData.OrderBy(x => x.CreationTime)
group d by new
{
time = new { d.CreationTime.Year, d.CreationTime.Month, d.CreationTime.Day,d.CreationTime.Hour }
} into g
select new
{
AverageValue = g.Average(p => p.Value),
CreationTimeStr = g.Key.time.Year + "-" + g.Key.time.Month + "-" + g.Key.time.Day+" "+g.Key.time.Hour+":00:00",
MaxValue = g.Max(x => x.Value),
MinValue = g.Min(x => x.Value)
}).ToList();
其他类推
group by 半小时
group by 半小时=group by 30分钟
(from d in YourData.OrderBy(x => x.CreationTime)
group d by new
{
time = new { d.CreationTime.Year, d.CreationTime.Month, d.CreationTime.Day, d.CreationTime.Hour, Minute = (d.CreationTime.Minute / 30) * 30 }
} into g
select new
{
Value = g.Average(p => p.Value),
CreationTimeStr = g.Key.time.Year + "-" + g.Key.time.Month + "-" + g.Key.time.Day + " " + g.Key.time.Hour + ":"+g.Key.time.Minute.ToString().PadRight(2,'0')+ ":00",
MaxValue = g.Max(x => x.Value),
MinValue = g.Min(x => x.Value)
}).ToList();
参考资料：https://stackoverflow.com/questions/12060743/grouping-by-every-n-minutes
