Question

我有List个以下对象：

public class DomainTimeErrors
{
    public int DomainId { get; set; }
    public int JobId { get; set; }
    public DateTime? FinishedAt { get; set; }
    public string Domain { get; set; }
    public string Url { get; set; }
}

如何在Url属性中获取具有相同值的对象，TimeSpan中FinishedAt之间的var list = new List<DomainTimeErrors> { new DomainTimeErrors { DomainId = 1, JobId = 1, FinishedAt = "2017-12-01 12:00", Domain = "so.com", Url = "so.com/id=1" }, new DomainTimeErrors { DomainId = 1, JobId = 2, FinishedAt = "2017-12-01 12:55", Domain = "so.com", Url = "so.com/id=1" }, new DomainTimeErrors { DomainId = 1, JobId = 3, FinishedAt = "2017-12-01 13:55", Domain = "so.com", Url = "so.com/id=1" }, new DomainTimeErrors { DomainId = 1, JobId = 4, FinishedAt = "2017-12-01 14:00", Domain = "so.com", Url = "so.com/id=1" }, new DomainTimeErrors { DomainId = 1, JobId = 11, FinishedAt = "2017-12-01 12:00", Domain = "so.com", Url = "so.com/id=2" }, new DomainTimeErrors { DomainId = 1, JobId = 12, FinishedAt = "2017-12-01 12:05", Domain = "so.com", Url = "so.com/id=2" }, new DomainTimeErrors { DomainId = 1, JobId = 13, FinishedAt = "2017-12-01 12:55", Domain = "so.com", Url = "so.com/id=2" }, new DomainTimeErrors { DomainId = 1, JobId = 14, FinishedAt = "2017-12-01 12:56", Domain = "so.com", Url = "so.com/id=2" } }值超过1小时。

编辑：

从以下列表中：

Url = "so.com/id=1"

我想只获得$('#add_name').val()中的一个，因为最早和最晚之间的时差超过1小时

Answer 1

使用Linq查询我希望它看起来像

from a in List
join b in List
  on a.Url equals b.Url
where (b.FinishedAt - a.FinishedAt).TotalHours>=1
select b;

然后，您将使用分组和选择器来筛选出不需要的值

即

from a in List.Where(i=>i.FinishedAt.HasValue)
join b in List.Where(i=>i.FinishedAt.HasValue)
  on a.Url equals b.Url
where (b.FinishedAt - a.FinishedAt).TotalHours>=1
group b by b.url into g
select g.FirstOrDefault();

EDIT 鉴于你的编辑我现在希望它看起来更像这个

from i in List
where i.FinishedAt != null
order by i.FinsihedAt 
group i by i.Url into g
where (g.Last().FinsihedAt -g.First().FinsihedAt ).TotalHours >=1
select g.Last();

Answer 2

如果您使用Linq to Object，我认为这个linq的查询会回答您的问题：

Func<IEnumerable<DomainTimeErrors>, bool> checkdiffrent = (items) =>
{
    var itemsCount=items.Count();
    if (itemsCount == 0 || itemsCount == 1)
      return true;

    var sortedItems=items.OrderBy(a=> a.FinishedAt.Value);
    var firstItem=sortedItems.First();
    var lastItem= sortedItems.Last();
    return (firstItem.FinishedAt- lastItem.FinishedAt).Value.TotalHours > 1;
}

var itemWithFinishDate = DomainTimeErrorsCollection.Where(a=> a.FinishedAt.HasValue).
var result = itemWithFinishDate.GroupBy(i=> i.Url).
                Where(sameUrls => checkdiffrent(sameUrls))
                .SelectMany(a=> a);

TimeSpan List中元素之间的差异

2 个答案: