Sort an array and return index of arrays according to elements size in c#

Question

I need to sort the array from minimum to maximum value, but I need to return only the index of array after sorting it. I dont want to swap values, I just need to return the valu

Answer 1

var indexes = arr.Select((i, inx) => new { i, inx })
                  .OrderBy(x => x.i)
                  .Select(x => x.inx)
                  .ToArray();