排队。C# 中的出列方法
原文:https://www . geesforgeks . org/queue-queue-method-in-c-sharp/
出列()方法用于返回队列开头的对象。该方法类似于 Peek()方法。出列和查看方法的唯一区别是，查看()方法不会修改队列，但出列会修改。这个方法是一个 O(1)操作，属于System.Collections命名空间。
语法:
public virtual object Dequeue ();
返回值:返回从队列开头删除的对象。
异常:该方法在调用空队列时抛出无效操作异常，因此在调用出列()方法之前，请始终检查队列的总计数是否大于零。
以下程序说明了上述方法的使用:
// C# Program to illustrate the use
// of Queue.Dequeue Method
using System;
using System.Collections;
class GFG {
// Main Method
public static void Main()
{
Queue queue = new Queue();
queue.Enqueue(3);
queue.Enqueue(2);
queue.Enqueue(1);
queue.Enqueue("Four");
Console.WriteLine("Number of elements in the Queue: {0}",
queue.Count);
// Retrieveing top element of queue
Console.WriteLine("Top element of queue is:");
Console.WriteLine(queue.Dequeue());
// printing the no of queue element
// after dequeue operation
Console.WriteLine("Number of elements in the Queue: {0}",
queue.Count);
}
}
Output:
Number of elements in the Queue: 4
Top element of queue is:
3
Number of elements in the Queue: 3
// C# Program to illustrate the use
// of Queue.Dequeue Method
using System;
using System.Collections;
class GFG {
// Main Method
public static void Main()
{
Queue queue = new Queue();
// Adding elements in Queue
queue.Enqueue(2);
queue.Enqueue("Four");
Console.WriteLine("Number of elements in the Queue: {0}",
queue.Count);
// Retrieveing top element of queue
Console.WriteLine("Top element of queue is:");
Console.WriteLine(queue.Dequeue());
// printing the no. of queue element
// after dequeue operation
Console.WriteLine("Number of elements in the Queue: {0}",
queue.Count);
}
}
Output:
Number of elements in the Queue: 2
Top element of queue is:
2
Number of elements in the Queue: 1
参考:
版权属于：月萌API www.moonapi.com，转载请注明出处
