QUEUE In C#

In this article you will learn about QUEUE.

Queue is FIFO (First In First Out) collection type & Generic class. Queue collection classes automatically size as required.

Syntax:

Queue<T>

Example:

Queue<int> rollno = new Queue<int>();

I like QUEUE collection, FIFO is also one kind of method to maintain the stock. There is no extra code required to follow FIFO. It is a readymade tool. You will see uses of QUEUE step by step.

I had created CONSOLE APPLICATION to work with QUEUE.

1. File, New, then Console Application.

Named QueuesConsoleApplicaton,



2. Queues,



3. The following are Methods and Properties of QUEUE,

 

• Enqueue
• DeQueue
• Peek
• ToArray
• TrimExcess
• Count
• Clear
• Contains

a. Enqueue : To add a new object at the end of the Queue List.

Queue < int > StudentRollNos = new Queue < int > ();
//Enqueue to Add New Item in Queue List
StudentRollNos.Enqueue(101);
StudentRollNos.Enqueue(102);
StudentRollNos.Enqueue(103);
StudentRollNos.Enqueue(104);
StudentRollNos.Enqueue(105);
Console.WriteLine("Studnet Roll List");
foreach(int studentRoll in StudentRollNos)
{
    Console.WriteLine("Roll No. : " + studentRoll.ToString());
}
Console.WriteLine("End of Studnet Roll List");
Console.ReadKey();

b. DeQueue: To remove first object from the Queue List.

StudentRollNos.Dequeue();

c. Peek: To get the first object from Queue List.

StudentRollNos.Peek();

d. ToArray: To convert your QUEUE list to an array.

Var StudentArray = StudentRollNos.ToArray();

e. TrimExcess: To reduce the uses of QUEUE memory usage.



f. Count: To get the number of objects in QUEUE.

StudentRollNos.Count()

g. Clear: To erase / remove all the objects from the QUEUE.

StudentRollNos.Clear()

h. Contains: To check whether an object is in the Queue.



Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace QueuesConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            Queue < int > StudentRollNos = new Queue < int > ();
            //Enqueue to Add New Item in Queue List
            StudentRollNos.Enqueue(101);
            StudentRollNos.Enqueue(102);
            StudentRollNos.Enqueue(103);
            StudentRollNos.Enqueue(104);
            StudentRollNos.Enqueue(105);
            Console.WriteLine("Studnet Roll List");
            foreach(int studentRoll in StudentRollNos)
            {
                Console.WriteLine("Roll No. : " + studentRoll.ToString());
            }
            Console.WriteLine("End of Studnet Roll List");
            Console.ReadKey();
            Console.WriteLine("Removing Studnet From List with Command DEQUEUE");
            StudentRollNos.Dequeue();
            Console.WriteLine("Print Again After Removing Studnet From List");
            foreach(int studentRoll in StudentRollNos)
            {
                Console.WriteLine("Roll No. : " + studentRoll.ToString());
            }
            Console.WriteLine("You Can See : 101 has been Removed Studnet From List");
            Console.ReadKey();
            Console.WriteLine();
            Console.WriteLine();
            Console.WriteLine("Display First Student Roll Number Studnet From List with Command PEEK");
            int PeekNo = StudentRollNos.Peek();
            Console.WriteLine("Peek Command Roll No. " + PeekNo.ToString());
            Console.ReadKey();
            Console.WriteLine();
            Console.WriteLine();
            Console.WriteLine("Now, Convertig QUEUES into ARRARY with Command ToArray");
            var StudentArray = StudentRollNos.ToArray();
            Console.WriteLine("Printing Array named STUDENTARRAY ");
            for (int i = 0; i != StudentArray.Length; i++)
            {
                Console.WriteLine("Roll No. : " + StudentArray[i].ToString());
            }
            Console.ReadKey();
            Console.WriteLine("Printed Each Array named STUDENTARRAY ");
            Console.WriteLine();
            Console.WriteLine();
            Console.ReadKey();
            //StudentRollNos.Count();
            Console.WriteLine("Total Number of Student " + StudentRollNos.Count().ToString());
            bool FoundValue101 = StudentRollNos.Contains(101);
            if (FoundValue101 == true)
            {
                Console.WriteLine("Roll No.101 Found");
            }
            else
            {
                Console.WriteLine("Roll No.101 Not Found");
            }
            Console.ReadKey();
            bool FoundValue102 = StudentRollNos.Contains(102);
            if (FoundValue102 == true)
            {
                Console.WriteLine("Roll No.102 Found");
            }
            else
            {
                Console.WriteLine("Roll No.102 Not Found");
            }
            Console.ReadKey();
        }
    }
}

Console Output