Csharp/CSharp Tutorial/Data Structure/Queue

Clear a Queue

<source lang="csharp">using System; using System.Collections; class MainClass {

 static void Main(string[] args)
 {
   Queue a = new Queue(10);
   int x = 0;
   a.Enqueue(x);
   x++;
   a.Enqueue(x);
   foreach (int y in a)
   {
     Console.WriteLine(y);
   }
   a.Dequeue();
   a.Clear();
 }

}</source>

0
1

Creating a list from a queue

<source lang="csharp">using System; using System.Collections; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Text; public class MainClass {

   public static void Main()
   {
       Queue <string> q = new Queue<string>();
       List<string> stringList = new List<string>(q);
   }

}</source>

Dequeue and Peek

<source lang="csharp">using System; using System.Collections.Generic;

   public class Tester
   {
       static void Main()
       {
           Queue<Int32> intQueue = new Queue<Int32>();
           for (int i = 0; i < 5; i++)
           {
               intQueue.Enqueue(i * 5);
           }
           PrintValues(intQueue);
           Console.WriteLine("\n(Dequeue)\t{0}", intQueue.Dequeue());
           Console.Write("intQueue values:\t");
           PrintValues(intQueue);
           Console.WriteLine("\n(Dequeue)\t{0}", intQueue.Dequeue());
           PrintValues(intQueue);
           Console.WriteLine("\n(Peek) \t{0}", intQueue.Peek());
           Console.Write("intQueue values:\t");
           PrintValues(intQueue);
       }
       public static void PrintValues(IEnumerable<Int32> myCollection)
       {
           IEnumerator <Int32> myEnumerator = myCollection.GetEnumerator();
           while (myEnumerator.MoveNext())
               Console.Write("{0} ", myEnumerator.Current);
        }
   }</source>

Enqueue and dequeue

<source lang="csharp">using System; using System.Collections;

class MainClass {

 public static void Main() { 
   Queue q = new Queue(); 

   q.Enqueue(1); 
   q.Enqueue(2); 
   q.Enqueue(3); 
   q.Enqueue(4); 

   Console.Write("queue: "); 
   foreach(int i in q) 
     Console.Write(i + " "); 

   Console.WriteLine();         
   Console.Write("Dequeue -> "); 
   int a = (int) q.Dequeue(); 
   Console.WriteLine(a); 

   Console.Write("queue: "); 
   foreach(int i in q) 
     Console.Write(i + " "); 

   Console.WriteLine();         

 } 

}</source>

queue: 1 2 3 4
Dequeue -> 1
queue: 2 3 4

Peek a queue

<source lang="csharp">using System; using System.Collections; using System.Collections.Specialized; class MyClass{

  public string MyName="A";   

} class MainClass {

 static void Main(string[] args)
 {
   Queue classQueue = new Queue();
   classQueue.Enqueue(new MyClass());
   classQueue.Enqueue(new MyClass());
   classQueue.Enqueue(new MyClass());
   // Peek at first car in Q.
   Console.WriteLine("First in Q is {0}",
     ((MyClass)classQueue.Peek()).MyName);
 }

}</source>

First in Q is A