/// <summary>
/// Tests for an overlap of given date ranges
/// </summary>
/// <param name="TestEndPoints">Set to true if you want to count the date range end points as an overlap and false if you don't care if the end points overlap.</param>
/// <param name="Ranges">The set of date ranges that you want to test.</param>
/// <returns>True if there is an overlap of the ranges. False if there is no overlap.</returns>
public static bool HasOverlap(bool TestEndPoints, params DateOverlap[] Ranges)
{
if (Ranges.Count() < 2)
{
throw new Exception("Ranges count must be greater than 1");
}
List <DateOverlap> Dates = new List <DateOverlap>();
List <DateOverlap> WhiteSpace = new List <DateOverlap>();
Dates.AddRange(Ranges);
Dates = Dates.OrderBy(r => r.Start).ToList();
Parallel.For(0, Dates.Count - 1, i =>
{
if (Dates[i].End < Dates[i + 1].Start)
{
WhiteSpace.Add(new DateOverlap(Dates[i].End, Dates[i + 1].Start));
}
});
TimeSpan total = Ranges.Max(r => r.End) - Ranges.Min(r => r.Start);
TimeSpan sum = new TimeSpan();
foreach (DateOverlap r in Ranges)
{
sum += r.Span;
}
foreach (DateOverlap r in WhiteSpace)
{
sum += r.Span;
}
if (sum < total)
{
return(false);
}
if (sum > total)
{
return(true);
}
if (!TestEndPoints)
{
return(false);
}
var query = from a in Dates
join b in Dates on a.Start equals b.End
select a;
return(query.Count() > 0);
}