通过DateTime属性遍历列表

我有一个List,我需要通过Created计算每天的平均值.如何优雅地迭代列表中显示的每一天的列表？每天可能存在空白,每天都有不同数量的物体.

例如,值可能是这样的:

public class MyObject
{
    public double Value { get; set; }
    public DateTime Created { get; set; }
}

{ Value: 1, Created: 2018-07-01 12:00:00 }
{ Value: 4, Created: 2018-07-01 20:00:00 }
{ Value: 2, Created: 2018-07-03 12:00:00 }
{ Value: 3, Created: 2018-07-04 09:00:00 }
{ Value: 2, Created: 2018-07-04 11:00:00 }
{ Value: 6, Created: 2018-07-04 12:00:00 }
{ Value: 5, Created: 2018-07-06 16:00:00 }
{ Value: 3, Created: 2018-07-06 11:00:00 }

我可以去做这样的事......

List items = itemsfrombackend;
DateTime beginDay = items.First().Created;
DateTime endDay = items.Last().Created;
for (DateTime day = beginDay; day <= endDay; day.AddDays(1))
{
    // if items contains any matching objects calculate avg
}

但是想用更少的ifs找到一种更简单的方法

我会GroupBy()结合使用Average()

var result = items.GroupBy(x => x.Created.Date)
                  .Select(x => new { Created = x.Key, Avg = x.Average(y => y.Value) });