Can I have List(T).ForEach() that traverses elements strictly in order?

There's List(T).ForEach() that performs an action on each element of the 开发者_JAVA百科list. However MSDN description doesn't say anything about the order in which List elements will be traversed and I need to have them traversed strictly in order.

How can I achieve that with ForEach()?

List<T>.ForEach will go in the same order as a normal foreach loop, which is also the natural order of the list.

Yes, the documentation doesn't state it - but it's the obvious behaviour, and I think it's pretty reasonable to rely on that not changing.

(Now Parallel.ForEach is a different matter, of course.)

If the order of the elements is essential I would recommend to use a Queue<T> (LIFO) or a Stack<T> (FIFO) which ensure the order by design. In this case you have to use a classic loop instead using the LINQ extension method or implement it by yourself.

The List<T> class represents an ordered collection of items, so iterating it using enumerators or ForEach method will preserve the order, even if the documentation is not very clear on this.