C# | Create a Queue from another collection Last Updated : 01 Feb, 2019 Comments Improve Suggest changes Like Article Like Report 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 deque. Queue.ToArray Method used to copy the Queue elements to a new array. 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: public T[] ToArray (); Here T[] is a new array containing elements copied from the Queue. Below given are some examples to understand the implementation in a better way : Example 1: CSHARP // C# code to Create a Queue // from a collection using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Creating a Queue of strings Queue<string> myQueue1 = new Queue<string>(); // Inserting the elements into the Queue myQueue1.Enqueue("GeeksforGeeks"); myQueue1.Enqueue("is"); myQueue1.Enqueue("the"); myQueue1.Enqueue("best"); myQueue1.Enqueue("website"); // Displaying the count of elements // contained in the myQueue1 Console.Write("Total number of elements in the Queue 1 are : "); Console.WriteLine(myQueue1.Count); // Displaying the elements in Queue myQueue1 foreach(string str in myQueue1) { Console.WriteLine(str); } // Creating a Queue from a collection Queue<string> myQueue2 = new Queue<string>(myQueue1.ToArray()); // Displaying the count of elements // contained in the myQueue2 Console.Write("Total number of elements in the Queue 2 are : "); Console.WriteLine(myQueue2.Count); // Displaying the elements in Queue myQueue2 foreach(string str in myQueue2) { Console.WriteLine(str); } } } Output: Total number of elements in the Queue 1 are : 5 GeeksforGeeks is the best website Total number of elements in the Queue 2 are : 5 GeeksforGeeks is the best website Example 2: CSHARP // C# code to Create a Queue // from a collection using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Creating a Queue of Integers Queue<int> myQueue1 = new Queue<int>(); // Inserting the elements into the Queue myQueue1.Enqueue(5); myQueue1.Enqueue(10); myQueue1.Enqueue(15); myQueue1.Enqueue(20); myQueue1.Enqueue(25); // Displaying the count of elements // contained in the myQueue1 Console.Write("Total number of elements in the Queue 1 are : "); Console.WriteLine(myQueue1.Count); // Displaying the elements in Queue myQueue1 foreach(int i in myQueue1) { Console.WriteLine(i); } // Creating a Queue from a collection Queue<int> myQueue2 = new Queue<int>(myQueue1.ToArray()); // Displaying the count of elements // contained in the myQueue2 Console.Write("Total number of elements in the Queue 2 are : "); Console.WriteLine(myQueue2.Count); // Displaying the elements in Queue myQueue2 foreach(int i in myQueue2) { Console.WriteLine(i); } } } Output: Total number of elements in the Queue 1 are : 5 5 10 15 20 25 Total number of elements in the Queue 2 are : 5 5 10 15 20 25 Reference: https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.queue-1.toarray?view=netframework-4.7.2 Comment More infoAdvertise with us Next Article C# | Create a Queue from another collection S Sahil_Bansall Follow Improve Article Tags : Misc C# CSharp-method CSharp-Generic-Queue CSharp-Collections-Namespace CSharp-Generic-Namespace +2 More Practice Tags : Misc Similar Reads How to create a Queue in C# Queue() Constructor is used to initializes a new instance of the Queue class which will be empty, and will have the default initial capacity, and uses the default growth factor. Queue represents a first-in, first out collection of object. It is used when you need first-in, first-out access of items. 2 min read queue::front() and queue::back() in C++ STL Queue are a type of container adaptors which operate in a first in first out (FIFO) type of arrangement. Elements are inserted at the back (end) and are deleted from the front. queue::front() This function is used to reference the first or the oldest element of the queue container. This function can 3 min read C# | Convert Queue To array 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 deque. Queue.ToArray Method is used to copy the Queue elements to a new array 2 min read Getting an object at the beginning of the Queue in C# The Dequeue() method is used to returns the object at the beginning of the Queue. This method is similar to the Peek() Method. The only difference between Dequeue and Peek method is that Peek() method will not modify the Queue but Dequeue will modify. This method is an O(1) operation and comes under 2 min read C# | Check if an element is in the Queue 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 deque. Queue.Contains(T) Method is used to check whether an element is in the 2 min read Like