Is it possible to use LINQ to check if all numbers in a list are increasing monotonically?

Question

I\'m interested if there is a way, in LINQ, to check if all numbers in a list are increasing monotonically?

Example

List l         


        

Answer 1

Here is a one-liner that will work:

var isIncreasing = list.OrderBy(x => x).SequenceEqual(list);

Or if you're going for performance, here is a one-liner that will only traverse the list once, and quits as soon as it reaches an element out of sequence:

var isIncreasing = !list.SkipWhile((x, i) => i == 0 || list[i - 1] <= x).Any();