Linq表达式,用于验证列表是按升序还是降序排序

Question

我有一个IEnumerable<DateTime>var,我需要验证它是按升序还是降序排序.

我可以使用for循环来做到这一点,但有没有办法使用LINQ表达式？

Answer 1

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");

Answer 2

上升:

myEnumerable.Zip(myEnumerable.Skip(1), (curr, next) => curr <= next).All(x => x);

降:

myEnumerable.Zip(myEnumerable.Skip(1), (curr, next) => curr >= next).All(x => x);

但是使用循环,LINQ并不是一切的神奇解决方案.