📜  C#|从另一个集合创建队列

📅  最后修改于: 2021-05-30 00:00:14             🧑  作者: Mango

队列代表对象的先进先出集合。当您需要对项目进行先进先出的访问时,可以使用它。当您在列表中添加一个项目时,它称为enqueue ,而当您删除一个项目时,它称为deque队列.ToArray方法用于复制队列元素到新数组。

特性 :

  • Enqueue将元素添加到队列的末尾。
  • 出队从队列开始处删除最旧的元素。
  • Peek返回位于队列开始处的最旧元素,但不会将其从队列中删除。
  • 队列的容量是队列可以容纳的元素数。
  • 随着元素添加到队列中,通过重新分配内部数组,容量会根据需要自动增加。
  • 队列接受null作为引用类型的有效值,并允许重复的元素。

句法:

public T[] ToArray ();

这里T []是一个新数组,其中包含从Queue复制的元素

下面给出了一些示例,以更好地理解实现:

范例1:

// C# code to Create a Queue
// from a collection
using System;
using System.Collections.Generic;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Creating a Queue of strings
        Queue myQueue1 = new Queue();
  
        // Inserting the elements into the Queue
        myQueue1.Enqueue("GeeksforGeeks");
        myQueue1.Enqueue("is");
        myQueue1.Enqueue("the");
        myQueue1.Enqueue("best");
        myQueue1.Enqueue("website");
  
        // Displaying the count of elements
        // contained in the myQueue1
        Console.Write("Total number of elements in the Queue 1 are : ");
  
        Console.WriteLine(myQueue1.Count);
  
        // Displaying the elements in Queue myQueue1
        foreach(string str in myQueue1)
        {
            Console.WriteLine(str);
        }
  
        // Creating a Queue from a collection
        Queue myQueue2 = new Queue(myQueue1.ToArray());
  
        // Displaying the count of elements
        // contained in the myQueue2
        Console.Write("Total number of elements in the Queue 2 are : ");
  
        Console.WriteLine(myQueue2.Count);
  
        // Displaying the elements in Queue myQueue2
        foreach(string str in myQueue2)
        {
            Console.WriteLine(str);
        }
    }
}
输出:
Total number of elements in the Queue 1 are : 5
GeeksforGeeks
is
the
best
website
Total number of elements in the Queue 2 are : 5
GeeksforGeeks
is
the
best
website

范例2:

// C# code to Create a Queue
// from a collection
using System;
using System.Collections.Generic;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Creating a Queue of Integers
        Queue myQueue1 = new Queue();
  
        // Inserting the elements into the Queue
        myQueue1.Enqueue(5);
        myQueue1.Enqueue(10);
        myQueue1.Enqueue(15);
        myQueue1.Enqueue(20);
        myQueue1.Enqueue(25);
  
        // Displaying the count of elements
        // contained in the myQueue1
        Console.Write("Total number of elements in the Queue 1 are : ");
  
        Console.WriteLine(myQueue1.Count);
  
        // Displaying the elements in Queue myQueue1
        foreach(int i in myQueue1)
        {
            Console.WriteLine(i);
        }
  
        // Creating a Queue from a collection
        Queue myQueue2 = new Queue(myQueue1.ToArray());
  
        // Displaying the count of elements
        // contained in the myQueue2
        Console.Write("Total number of elements in the Queue 2 are : ");
  
        Console.WriteLine(myQueue2.Count);
  
        // Displaying the elements in Queue myQueue2
        foreach(int i in myQueue2)
        {
            Console.WriteLine(i);
        }
    }
}
输出:
Total number of elements in the Queue 1 are : 5
5
10
15
20
25
Total number of elements in the Queue 2 are : 5
5
10
15
20
25

参考:

  • https://docs.microsoft.com/zh-cn/dotnet/api/system.collections.generic.queue-1.toarray?view=netframework-4.7.2