C# |从堆栈中移除所有对象
栈 代表一个 后进先出 的集合对象。当您需要后进先出访问项目时，可以使用它。当您在列表中添加一个项目时，它被称为推动项目，当您移除它时，它被称为弹出项目。堆叠< T >。清除方法用于从堆栈中移除所有对象< T >。此方法为 O(n) 操作，其中 n 为计数。
属性:
- 堆栈的容量是堆栈可以容纳的元素数量。随着元素添加到堆栈中，容量会根据需要通过重新分配自动增加。
- 如果计数小于堆栈的容量，推送是一个0(1)操作。如果需要增加容量来容纳新元素，Push 将成为 O(n) 操作，其中 n 为 Count。Pop 是一个 O(1) 操作。
- 堆栈接受 null 作为有效值，并允许重复元素。
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 Stack
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Creating a Stack of strings
Stack<string> myStack = new Stack<string>();
// Inserting the elements into the Stack
myStack.Push("1st Element");
myStack.Push("2nd Element");
myStack.Push("3rd Element");
myStack.Push("4th Element");
myStack.Push("5th Element");
myStack.Push("6th Element");
// Displaying the count of elements
// contained in the Stack before
// removing all the elements
Console.Write("Total number of elements in the Stack are : ");
Console.WriteLine(myStack.Count);
// Removing all elements from Stack
myStack.Clear();
// Displaying the count of elements
// contained in the Stack after
// removing all the elements
Console.Write("Total number of elements in the Stack are : ");
Console.WriteLine(myStack.Count);
}
}
Output:
Total number of elements in the Stack are : 6
Total number of elements in the Stack are : 0
例 2:
// C# code to Remove all
// objects from the Stack
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Creating a Stack of Integers
Stack<int> myStack = new Stack<int>();
// Inserting the elements into the Stack
myStack.Push(3);
myStack.Push(5);
myStack.Push(7);
myStack.Push(9);
myStack.Push(11);
// Displaying the count of elements
// contained in the Stack before
// removing all the elements
Console.Write("Total number of elements in the Stack are : ");
Console.WriteLine(myStack.Count);
// Removing all elements from Stack
myStack.Clear();
// Displaying the count of elements
// contained in the Stack after
// removing all the elements
Console.Write("Total number of elements in the Stack are : ");
Console.WriteLine(myStack.Count);
}
}
Output:
Total number of elements in the Stack are : 5
Total number of elements in the Stack are : 0
参考:
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