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
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 virtual void Clear();
下面给出了一些示例,以更好地理解实现:
范例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 myQueue = new Queue();
// 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);
}
}
输出:
Total number of elements in the Queue are : 6
Total number of elements in the Queue are : 0
范例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 myQueue = new Queue();
// 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);
}
}
输出:
Total number of elements in the Queue are : 5
Total number of elements in the Queue are : 0
参考:
- https://docs.microsoft.com/zh-cn/dotnet/api/system.collections.generic.queue-1.clear?view=netframework-4.7.2