AddRange to a Collection

Question

A coworker asked me today how to add a range to a collection. He has a class that inherits from Collection. There\'s a get-only property of that type t

Answer 1

Since .NET4.5 if you want one-liner you can use System.Collections.Generic ForEach.

source.ForEach(o => destination.Add(o));

or even shorter as

source.ForEach(destination.Add);

Performance-wise it's the same as for each loop (syntactic sugar).

Also don't try assigning it like

var x = source.ForEach(destination.Add) 

cause ForEach is void.

Edit: Copied from comments, Lipert's opinion on ForEach