C# Queue

C# Queue

In C# the Queue collection is the special type of collection that stores elements in FIFO (First in First out) style. The Queue collection is available in both generic and non-generic types of collection classes so it is present in both System.Collection.Generic and System.Collection namespace.

Let’s see the simple code example of the generic Queue collection.

 
using System;
using System.Collections;
using System.Collections.Generic;

namespace ConsoleAppDemo
{
    class Program
    {
        static void Main(string[] args)
        {

            Queue queueDemo = new Queue();
            queueDemo.Enqueue(1);
            queueDemo.Enqueue(2);
            queueDemo.Enqueue(3);
            queueDemo.Enqueue(4);
            queueDemo.Enqueue(5);

            foreach (var item in queueDemo)
            {
                Console.WriteLine(item);
            }



            Console.ReadKey();
        }
    }
}
    

Output:

1
2
3
4
5

Let's see another example of the non-generic type of Queue collection.

 
using System;
using System.Collections;
using System.Collections.Generic;

namespace ConsoleAppDemo
{
    class Program
    {
        static void Main(string[] args)
        {

            Queue queueDemo = new Queue();
            queueDemo.Enqueue("One");
            queueDemo.Enqueue(2);
            queueDemo.Enqueue("Josh");
            queueDemo.Enqueue(4);
            queueDemo.Enqueue("C");

            foreach (var item in queueDemo)
            {
                Console.WriteLine(item);
            }



            Console.ReadKey();
        }
    }
}
      

Output:

One
2
Josh
4
C