Szathmáry László honlapja @ DEIK

Reverse a list

You want to reverse a list without changing the original list. That is, you want to get a reversed copy.

var tmp = new List<int> {1, 4, 6, 9};

WriteLine(tmp.Pretty()); // [1, 4, 6, 9]
WriteLine(Enumerable.Reverse(tmp).ToList().Pretty()); // [9, 6, 4, 1]
WriteLine(tmp.Pretty()); // [1, 4, 6, 9]

list.Pretty() is simply responsible for pretty printing a list (find its source here). Enumerable.Reverse() returns an iterator.

Note that it also works with other enumerable objects, not only with lists!

Reverse a list in place

If you want to reverse a list in place, then use this:

li.Reverse();

It has no return value and it modifies the list in place.

20180406b

Reverse a list

Reverse a list in place