Question

I have a class defined as below.

public class Risk
{
   public DateTime RiskDate { get; set;}
   public string RiskStatus { get; set;}    
}

And I have a List of Risk as below

RiskDate RiskStatus

10/10/2001 High

15/10/2001 Low

21/10/2001 High

28/10/2001 Low

05/11/2001 High

08/11/2001 Low

I would like to find the date range from the list for a given date. For example, if my input date is 17/10/2001 then I would like to pull 15/10/2001 and 21/10/2001 from the list. If my input date is an exact match to the list, for example 28/10/2001, then I would like to pull only that date from the list.

I hope someone can advice me on this.

Thanks

Answer 1

This works:

var lower =
    from d in dates
    where d <= inputDate
    orderby d descending
    select d;

var upper =
    from d in dates
    where d >= inputDate
    orderby d
    select d;

var range = lower.Take(1)
    .Concat(upper.Take(1))
    .Distinct();