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  • C# |检查队列中是否有元素

C# |检查队列中是否有元素

原文:https://www . geeksforgeeks . org/c-sharp-检查一个元素是否在队列中/

队列 代表一个 先进先出 集合的对象。当您需要先进先出访问项目时,可以使用它。当您在列表中添加一个项目时,它被称为入队,当您移除一个项目时,它被称为出队排队。Contains(T)方法 用于检查一个元素是否在队列中。

属性:

  • Enqueue Add an element at the end of the queue.
  • dequeue Remove the oldest element from the beginning of the queue.
  • peek Returns the earliest element at the beginning of the queue, but it will not be removed from the queue.
  • The capacity of the queue is the number of elements that the queue can hold.
  • When elements are added to the queue, the capacity will automatically increase as needed by reallocating the internal array.
  • The queue accepts null value as valid value of reference type, and allows duplicate elements.

语法:

public virtual bool Contains(object obj);

返回值:如果元素存在于队列中,函数返回,如果元素不存在于队列中,函数返回

下面给出了一些例子,以便更好地理解实现:

例 1:

// C# code to Check if a Queue
// contains an element
using System;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a Queue of Integers
        Queue<int> myQueue = new Queue<int>();

        // Inserting the elements into the Queue
        myQueue.Enqueue(5);
        myQueue.Enqueue(10);
        myQueue.Enqueue(15);
        myQueue.Enqueue(20);
        myQueue.Enqueue(25);

        // Checking whether the element is
        // present in the Queue or not
        // The function returns True if the
        // element is present in the Queue, else
        // returns False
        Console.WriteLine(myQueue.Contains(7));
    }
}

Output:

False

例 2:

// C# code to Check if a Queue
// contains an element
using System;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a Queue of strings
        Queue<string> myQueue = new Queue<string>();

        // Inserting the elements into the Queue
        myQueue.Enqueue("Geeks");
        myQueue.Enqueue("Geeks Classes");
        myQueue.Enqueue("Noida");
        myQueue.Enqueue("Data Structures");
        myQueue.Enqueue("GeeksforGeeks");

        // Checking whether the element is
        // present in the Queue or not
        // The function returns True if the
        // element is present in the Queue, else
        // returns False
        Console.WriteLine(myQueue.Contains("GeeksforGeeks"));
    }
}

Output:

True

参考:

  • https://docs . Microsoft . com/en-us/dotnet/API/system . collections . generic . queue-1 . contains?视图=netframework-4.7.2


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