How to convert List<List<int>> to an array of arrays

int[][] arrays = lst.Select(a => a.ToArray()).ToArray();

It's easy with LINQ:

lst.Select(l => l.ToArray()).ToArray()

If you really wanted two-dimentional array (int[,], not int[][]), that would be more difficult and the best solution would probably be using nested fors.

you can easily do it using linq.

int[][] arrays = lst.Select(a => a.ToArray()).ToArray();

but if you want another way you can loop through the list and manually generate the 2d array.

how to loop through nested list