C# Queue - c# - c# tutorial - c# net



What is Queue in C# ?

  • C# Queue<T> class is used to Enqueue and Dequeue elements.
  • It uses the concept of Queue that arranges elements in FIFO (First In First Out) order.
  • It can have duplicate elements.
  • It is found in System.Collections.Generic namespace.
 Data Queue

Constructors:

  • Queue<T> Constructor - Initializes a new instance of the Queue<T> class that is empty. The next lines shows how we create the empty queue.
    Queue<string> queue = new Queue<string>();
  • Queue<T> Constructor (IEnumerable<T>) - Initializes a new instance of the Queue<T>class that contains elements copied from the specified collection.
string[] courses = { "MCA","MBA", "BCA","BBA", "BTech","MTech" };
Queue<string> queue = new Queue<string>(courses);
 Queue

Queue

  • Queue<T> Constructor (Int32) - Initializes a new instance of the Queue<T> class that is empty and has the specified initial capacity.
Queue<string> queue = new Queue<string>(4);

C# Queue<T> example:

  • Let's see an example of generic Queue<T> class that stores elements using Enqueue() method, removes elements using Dequeue() method and iterates elements using for-each loop.
using System;  
using System.Collections.Generic;  
  
public class QueueExample  
{  
    public static void Main(string[] args)  
    {  
        Queue<string> names = new Queue<string>();  
        names.Enqueue("Sonoo");  
        names.Enqueue("Peter");  
        names.Enqueue("James");  
        names.Enqueue("Ratan");  
        names.Enqueue("Irfan");  
  
        foreach (string name in names)  
        {  
            Console.WriteLine(name);  
        }  
  
        Console.WriteLine("Peek element: "+names.Peek());  
        Console.WriteLine("Dequeue: "+ names.Dequeue());  
      Console.WriteLine("After Dequeue, Peek element: " + names.Peek());  
    }  
}  

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C# examples - Output :

Sonoo
Peter
James
Ratan
Irfan
Peek element: Sonoo
Dequeue: Sonoo
After Dequeue, Peek element: Peter


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