C# | Add an object to the end of the Queue – Enqueue Operation
Queue represents a first-in, first out collection of object. It is used when you need a first-in, first-out access of items. When you add an item in the list, it is called enqueue, and when you remove an item, it is called dequeue.
Queue<T>.Enqueue(T) Method is used to add an object to the end of the Queue<T>.
Properties:
- Enqueue adds an element to the end of the Queue.
- Dequeue removes the oldest element from the start of the Queue.
- Peek returns the oldest element that is at the start of the Queue but does not remove it from the Queue.
- The capacity of a Queue is the number of elements the Queue can hold.
- As elements are added to a Queue, the capacity is automatically increased as required by reallocating the internal array.
- Queue accepts null as a valid value for reference types and allows duplicate elements.
Syntax :
void Enqueue(object obj);
The Enqueue() method inserts values at the end of the Queue.
Example:
// C# code to add an object // to the end of the Queue using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Creating a Queue of strings Queue< string > myQueue = new Queue< string >(); // Inserting the elements into the Queue myQueue.Enqueue( "one" ); // Displaying the count of elements // contained in the Queue Console.Write( "Total number of elements in the Queue are : " ); Console.WriteLine(myQueue.Count); myQueue.Enqueue( "two" ); // Displaying the count of elements // contained in the Queue Console.Write( "Total number of elements in the Queue are : " ); Console.WriteLine(myQueue.Count); myQueue.Enqueue( "three" ); // Displaying the count of elements // contained in the Queue Console.Write( "Total number of elements in the Queue are : " ); Console.WriteLine(myQueue.Count); myQueue.Enqueue( "four" ); // Displaying the count of elements // contained in the Queue Console.Write( "Total number of elements in the Queue are : " ); Console.WriteLine(myQueue.Count); myQueue.Enqueue( "five" ); // Displaying the count of elements // contained in the Queue Console.Write( "Total number of elements in the Queue are : " ); Console.WriteLine(myQueue.Count); myQueue.Enqueue( "six" ); // Displaying the count of elements // contained in the Queue Console.Write( "Total number of elements in the Queue are : " ); Console.WriteLine(myQueue.Count); } } |
Output:
Total number of elements in the Queue are : 1 Total number of elements in the Queue are : 2 Total number of elements in the Queue are : 3 Total number of elements in the Queue are : 4 Total number of elements in the Queue are : 5 Total number of elements in the Queue are : 6
Reference:
- https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.queue-1.enqueue?view=netframework-4.7.2#System_Collections_Generic_Queue_1_Enqueue__0_
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