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LINQ: Max or Default?
I have some LINQ to filter DateTime vars.
List<DateTime> lst1 = new List<DateTime>(); //.... add DataTime here var d = lst1.Where(q => q <= DateTime.Now).Max(); And if I have no matched item the exceptions occurs.
I need to get empty d or at least null and I don't need exception here at all.
How do I can fix it?
Thank you!
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When you get the LINQ error "Sequence contains no elements", this is usually because you are using the First() or Single() command rather than FirstOrDefault() and SingleOrDefault() .
SingleOrDefault() – Same as Single(), but it can handle the null value. First() - There is at least one result, an exception is thrown if no result is returned. FirstOrDefault() - Same as First(), but not thrown any exception or return null when there is no result.
FirstOrDefault<TSource>(IEnumerable<TSource>, TSource) Returns the first element of a sequence, or a specified default value if the sequence contains no elements. FirstOrDefault<TSource>(IEnumerable<TSource>) Returns the first element of a sequence, or a default value if the sequence contains no elements.
Try
var d = lst1.Where(q => q <= DateTime.Now).DefaultIfEmpty().Max(); Your result will now contain DateTime.MinValue if there are no matches
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