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Queue with Examples in C#?
<p>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# −</p><table class="table table-bordered"><thead><tr><th>Sr.No</th><th style="text-align: center;">Methods & Description</th></tr></thead><tbody><tr><td style="text-align: center;">1</td><td><strong>Clear()</strong><br>Removes all objects from the Queue<T>.<br></td></tr><tr><td style="text-align: center;">2</td><td><strong>Contains(T)</strong><br>Determines whether an element is in the Queue<T>.<br></td></tr><tr><td style="text-align: center;">3</td><td><strong>CopyTo(T[], Int32)</strong><br>Copies the Queue>T< elements to an existing onedimensional Array, starting at the specified array index.<br></td></tr><tr><td style="text-align: center;">4</td><td><strong>Dequeue()</strong><br>Removes and returns the object at the beginning of the Queue<T>.<br></td></tr><tr><td style="text-align: center;">5</td><td><strong>Enqueue(T)</strong><br>Adds an object to the end of the Queue<T>.<br></td></tr><tr><td style="text-align: center;">6</td><td><strong>Equals(Object)</strong><br>Determines whether the specified object is equal to the current object.(Inherited from Object)<br></td></tr><tr><td style="text-align: center;">7</td><td><strong>GetEnumerator()</strong><br>Returns an enumerator that iterates through the Queue<T><br></td></tr><tr><td style="text-align: center;">8</td><td><strong>GetHashCode()</strong><br>Serves as the default hash function. (Inherited from Object)<br></td></tr><tr><td style="text-align: center;">9</td><td><strong>GetType()</strong><br>Gets the Type of the current instance.<br></td></tr></tbody></table><h2>Example</h2><p>Let us now see some examples −</p><p>To get the object at the beginning of the Queue, the code is as follows −</p><p><a class="demo" href="http://tpcg.io/KbX04snk" rel="nofollow" target="_blank"> Live Demo</a></p><pre class="prettyprint notranslate">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()); } }</pre><h2>Output</h2><p>This will produce the following output −</p><pre class="result notranslate">Count of elements = 7 Element at the beginning of queue = A</pre><p>To remove all objects from the Queue, the code is as follows −</p><h2>Example</h2><p><a class="demo" href="http://tpcg.io/TRAGXgQ7" rel="nofollow" target="_blank"> Live Demo</a></p><pre class="prettyprint notranslate">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); } }</pre><h2>Output</h2><p>This will produce the following output −</p><pre class="result notranslate">Count of elements = 8 Count of elements (updated) = 0</pre>
Updated on 16-Dec-2019 08:18:16
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