Question

I have an object of type IEnumerable<IEnumerable<int>>. I need to sort the ints within the inner IEnumerable<int> but I am not sure how to do this.

I attempted to convert IEnumerable<IEnumerable<int>> to List<List<int>> to make the sort easier with this code:

var sortedResults = results.ForEach(x => x.ToList());

But I receive the error “Cannot assign void to implicitly-typed variable”

I also receive the same error if I to the sorting and the conversion all at once:

var sortedResults = results.ToList().ForEach(x => x.ToList().Sort((a ,b) => a.CompareTo(b))));

What is the best way to do this?

Answer 1

Just use OrderBy – since these are integers that means you can use the number itself as criteria:

sortedResults = results.Select(x => x.OrderBy(num => num));

Above assumes you want the output to be just a IEnumerable<IEnumerable<int>> if you need lists, use ToList() were needed.