解决方法
var orderedByAsc = input.OrderBy(d => d); if (input.SequenceEqual(orderedByAsc)) { Console.WriteLine("Ordered by Asc"); return; } var orderedByDsc = input.OrderByDescending(d => d); if (input.SequenceEqual(orderedByDsc)) { Console.WriteLine("Ordered by Dsc"); return; } Console.WriteLine("not sorted");