Queue with Examples in C#?
The Queue class in C# is the first-in, first-out collection of objects. Let us see some of the methods of the Queue class in C# −
| Sr.No | Methods & Description |
|---|
| 1 | Clear()
Removes all objects from the Queue<T>.
|
| 2 | Contains(T)
Determines whether an element is in the Queue<T>.
|
| 3 | CopyTo(T[], Int32)
Copies the Queue>T< elements to an existing onedimensional Array, starting at the specified array index.
|
| 4 | Dequeue()
Removes and returns the object at the beginning of
the Queue<T>.
|
| 5 | Enqueue(T)
Adds an object to the end of the Queue<T>.
|
| 6 | Equals(Object)
Determines whether the specified object is equal to the
current object.(Inherited from Object)
|
| 7 | GetEnumerator()
Returns an enumerator that iterates through
the Queue<T>
|
| 8 | GetHashCode()
Serves as the default hash function. (Inherited from Object)
|
| 9 | GetType()
Gets the Type of the current instance.
|
Example
Let us now see some examples −
To get the object at the beginning of the Queue, the code is as follows −
Live Demo
using System;
using System.Collections.Generic;
public class Demo {
public static void Main() {
Queue<string> queue = new Queue<string>();
queue.Enqueue("A");
queue.Enqueue("B");
queue.Enqueue("C");
queue.Enqueue("D");
queue.Enqueue("E");
queue.Enqueue("F");
queue.Enqueue("G");
Console.WriteLine("Count of elements = "+queue.Count);
Console.WriteLine("Element at the beginning of queue = " + queue.Peek());
}
}Output
This will produce the following output −
Count of elements = 7
Element at the beginning of queue = A
To remove all objects from the Queue, the code is as follows −
Example
Live Demo
using System;
using System.Collections.Generic;
public class Demo {
public static void Main() {
Queue<string> queue = new Queue<string>();
queue.Enqueue("Gary");
queue.Enqueue("Jack");
queue.Enqueue("Ryan");
queue.Enqueue("Kevin");
queue.Enqueue("Mark");
queue.Enqueue("Jack");
queue.Enqueue("Ryan");
queue.Enqueue("Kevin");
Console.Write("Count of elements = ");
Console.WriteLine(queue.Count);
queue.Clear();
Console.Write("Count of elements (updated) = ");
Console.WriteLine(queue.Count);
}
}Output
This will produce the following output −
Count of elements = 8
Count of elements (updated) = 0
Published on 16-Dec-2019 12:45:18
