c#中queue队列用法

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace QueueSample{    class Program    {        static void Main(string[] args)        {            Queue<string> numbers = new Queue<string>();            numbers.Enqueue("one");            numbers.Enqueue("two");            numbers.Enqueue("three");            numbers.Enqueue("four");            numbers.Enqueue("five");            // A queue can be enumerated without disturbing its contents.            foreach (string number in numbers)            {                Console.WriteLine(number);            }            Console.WriteLine("\nDequeuing '{0}'", numbers.Dequeue());            Console.WriteLine("Peek at next item to dequeue: {0}",                numbers.Peek());            Console.WriteLine("Dequeuing '{0}'", numbers.Dequeue());            // Create a copy of the queue, using the ToArray method and the            // constructor that accepts an IEnumerable<T>.            Queue<string> queueCopy = new Queue<string>(numbers.ToArray());            Console.WriteLine("\nContents of the first copy:");            foreach (string number in queueCopy)            {                Console.WriteLine(number);            }            // Create an array twice the size of the queue and copy the            // elements of the queue, starting at the middle of the             // array.             string[] array2 = new string[numbers.Count * 2];            numbers.CopyTo(array2, numbers.Count);            // Create a second queue, using the constructor that accepts an            // IEnumerable(Of T).            Queue<string> queueCopy2 = new Queue<string>(array2);            Console.WriteLine("\nContents of the second copy, with duplicates and nulls:");            foreach (string number in queueCopy2)            {                Console.WriteLine(number);            }            Console.WriteLine("\nqueueCopy.Contains(\"four\") = {0}",                queueCopy.Contains("four"));            Console.WriteLine("\nqueueCopy.Clear()");            queueCopy.Clear();            Console.WriteLine("\nqueueCopy.Count = {0}", queueCopy.Count);            Console.ReadLine();        }    }}