Question

我有许多具有各种DateTimes的记录，但我需要在图形布局中跟踪这些记录。我目前已设法检索每条记录的时间跨度

List<myclass> recs = context.myclass.Where(c => c.RequestedTimestamp >= start & c.DeliveredTimestamp <= end).ToList();

foreach (var item in recs) 
{
    TimeSpan diff = (TimeSpan)(item.DeliveredTimestamp - item.RequestedTimestamp);

    //more to come, this is where I realized I have issues
}

这当然会返回一个时间表列表，但这本身并不是很有帮助。

为了获得这些时间跨度的每周（或每月）平均值列表，如何更好地接近这一点。

我考虑的问题是时间跨度会忘记它们的起点和终点，因此虽然可以对这些点进行平均，但是如何以分组方法执行平均值？

输出;一组DateTimes的平均时间跨度将被挂钩到图表中以进行可视化显示。

Answer 1

这可能不是最好的解决方案，并且逻辑中存在一些明确的漏洞，但是现在这是一个在需要的范围内工作的解决方案（低优先级系统因此不需要高精度）。另外，对于那里的所有审查变量，例如班级名称等，我很难过，我理解它更难以阅读。

public static List<ChartPoint> RenderWeeklyAverageChart(List<myclass> myclass, DateTime start, DateTime end)
        {
            DateTime datePointer = start; //1st date in list
            List<ChartPoint> points = new List<ChartPoint>();
            double average = 0;

            if (myclass!= null && myclass.Count > 0)
            {
                while (datePointer < DateTime.Now)
                {
                    //Filter By Selected Week
                    List<myclass> Weekmyclass = myclass.Where(c => c.RequestedTimestamp >= datePointer &&
                        c.RequestedTimestamp < datePointer.AddDays(7)).ToList();
                    //If there are records, find the average timespan of the records
                    if (Weekmyclass != null && Weekmyclass.Count > 0)
                    {
                        long ticks = (long)WeekSlabs.Average(c => (c.DeliveredTimestamp.Value - c.RequestedTimestamp.Value).Ticks);
                        average = TimeSpan.FromTicks(ticks).TotalHours;

                        points.Add(new ChartPoint
                        {
                            PointValue = average,
                            AxisXText = datePointer.ToShortDateString() + " - "
                                        + datePointer.AddDays(7).ToShortDateString()
                        });
                    }
                    else
                    {
                        //Otherwise Add a Zero Record
                        points.Add(new ChartPoint
                        {
                            PointValue = 0,
                            AxisXText = datePointer.ToShortDateString() + " - "
                                        + datePointer.AddDays(7).ToShortDateString()
                        });
                    }
                    datePointer = datePointer.AddDays(7);
                }
            }
            return points;
        }

按星期分组和平均时间跨度

1 个答案: