How to Enqueue a list of items in C#?

Question

Using lists I use

List<int> list = new List<int>();
list.AddRange(otherList);

How to do this using a Queue?, this Collection does not have a AddRange Method.

Queue<int> q = new Queue<int>();
q.AddRange(otherList); //does not exists

Is the answer basically "You can at construction, but there is no optimized AddRange equivalent other than calling Enqueue one-by-one." ? — billpg, Jun 11 '18 at 16:09

score 42 · Answer 1 · edited Dec 08 '21 at 21:11

42

otherList.ForEach(o => q.Enqueue(o));

You can also use this extension method:

    public static void AddRange<T>(this Queue<T> queue, IEnumerable<T> enu) {
        foreach (T obj in enu)
            queue.Enqueue(obj);
    }

    Queue<int> q = new Queue<int>();
    q.AddRange(otherList); //Work!

edited Dec 08 '21 at 21:11

Boris Sokolov

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answered Oct 02 '13 at 15:55

Ahmed KRAIEM

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you can use `otherList.Foreach(q.Enqueue)` without boxing it into another lambda expression – Adassko Oct 17 '13 at 12:30

score 22 · Accepted Answer · answered Oct 02 '13 at 16:02

22

Queue has a constructor that takes in an ICollection. You can pass your list into the queue to initialize it with the same elements:

var queue = new Queue<T>(list);

in your case use as follows

Queue<int> ques = new Queue<int>(otherList);

answered Oct 02 '13 at 16:02

Thilina H

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Solves the OP's question, but only works for an empty Queue. – v01pe Dec 13 '19 at 10:10

score 5 · Answer 3 · answered Oct 02 '13 at 15:59

5

You can initialize the queue list:

Queue<int> q = new Queue<int>(otherList);

answered Oct 02 '13 at 15:59

LarsTech

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How to Enqueue a list of items in C#?

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