C# |从队列中移除所有对象
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。清除方法 用于从队列中移除对象。该方法为 O(n) 运算，其中 n 为元素总数。
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 in the queue, but it is not 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 void Clear();
下面给出了一些例子，以便更好地理解实现:
例 1:
// C# code to Remove all
// objects from the Queue
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("1st Element");
myQueue.Enqueue("2nd Element");
myQueue.Enqueue("3rd Element");
myQueue.Enqueue("4th Element");
myQueue.Enqueue("5th Element");
myQueue.Enqueue("6th Element");
// Displaying the count of elements
// contained in the Queue before
// removing all the elements
Console.Write("Total number of elements in the Queue are : ");
Console.WriteLine(myQueue.Count);
// Removing all elements from Queue
myQueue.Clear();
// Displaying the count of elements
// contained in the Queue after
// removing all the elements
Console.Write("Total number of elements in the Queue are : ");
Console.WriteLine(myQueue.Count);
}
}
Output:
Total number of elements in the Queue are : 6
Total number of elements in the Queue are : 0
例 2:
// C# code to Remove all
// objects from the Queue
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(3);
myQueue.Enqueue(5);
myQueue.Enqueue(7);
myQueue.Enqueue(9);
myQueue.Enqueue(11);
// Displaying the count of elements
// contained in the Queue before
// removing all the elements
Console.Write("Total number of elements in the Queue are : ");
Console.WriteLine(myQueue.Count);
// Removing all elements from Queue
myQueue.Clear();
// Displaying the count of elements
// contained in the Queue after
// removing all the elements
Console.Write("Total number of elements in the Queue are : ");
Console.WriteLine(myQueue.Count);
}
}
Output:
Total number of elements in the Queue are : 5
Total number of elements in the Queue are : 0
参考:
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