LINQ而不是嵌套的foreach和if

Question

有誰知道Linq代碼用於以下代碼？：

foreach (Bed bed in field.GetBeds())
{
    foreach (Asparagus asparagus in bed.GetAsparaguses())
    {
        if (asparagus.Time.Date == day.Date && asparagus.Harvested)
        {
            count++;
        }
    }
}

Answer 1

訣竅是使用SelectMany展平嵌套項目。

var count = field.BetBeds()
    .SelectMany(bed => bed.GetAsparaguses())
    .Where(asparagus => asparagus.Time.Date == day.Date && asparagus.Harvested)
    .Count();

Answer 2

通過SelectMany來獲取所有蘆筍，並根據“ Where和“ Count結果”中的條件對其進行過濾

field.GetBeds()
     .SelectMany(bed => bed.GetAsparaguses())
     .Where(asparagus => asparagus.Time.Date == day.Date && asparagus.Harvested)
     .Count();