If I have two lists of type string (or any other type), what is a quick way of joining the two lists?
The order should stay the same. Duplicates should be removed (though every item in both links are unique). I didn't find much on this when googling and didn't want to implement any .NET interfaces for speed of delivery.
You could try:
List<string> a = new List<string>();
List<string> b = new List<string>();
a.AddRange(b);
MSDN page for AddRange
This preserves the order of the lists, but it doesn't remove any duplicates which Union
would do.
This does change list a
. If you wanted to preserve the original lists then you should use Concat
(as pointed out in the other answers):
var newList = a.Concat(b);
This returns an IEnumerable
as long as a
is not null.
The way with the least space overhead is to use the Concat extension method.
var combined = list1.Concat(list2);
It creates an instance of IEnumerable<T>
which will enumerate the elements of list1 and list2 in that order.
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