What is the Queue class in C#?

To represent a first-in first-out collection of objects in C#, use the Queue class. When you add an item in the list, it is called enqueue, and when you remove an item, it is called deque.

Some of the methods of the Queue class include.

Let us see how to work with enqueue and deque in C# that comes under the queue class.

Example

 Live Demo

using System;
using System.Collections;
namespace Demo {
   class Program {
      static void Main(string[] args) {
         Queue q = new Queue();
         q.Enqueue('A');
         q.Enqueue('B');
         q.Enqueue('C');
         q.Enqueue('D');
         Console.WriteLine("Current queue: ");
         foreach (char c in q) Console.Write(c + " ");
         Console.WriteLine();
         q.Enqueue('E');
         q.Enqueue('F');
         q.Enqueue('G');
         q.Enqueue('H');
         Console.WriteLine("Current queue: ");
         foreach (char c in q) Console.Write(c + " ");
         Console.WriteLine();
         Console.WriteLine("Removing some values ");
         char ch = (char)q.Dequeue();
         Console.WriteLine("Value removed: {0}", ch);
         ch = (char)q.Dequeue();
         Console.WriteLine("Value removed: {0}", ch);
         Console.ReadKey();
      }
   }
}

Output

Current queue:
A B C D
Current queue:
A B C D E F G H
Removing some values
Value removed: A
Value removed: B

Above, using enqueue the elements are added.

Queue q = new Queue();
q.Enqueue('A');
q.Enqueue('B');
q.Enqueue('C');
q.Enqueue('D');

The elements are deleted using dequeue.

char ch = (char)q.Dequeue();
Console.WriteLine("Value removed: {0}", ch);