C# |从堆栈中移除所有对象

原文:https://www . geesforgeks . org/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:

https://docs . Microsoft . com/en-us/dotnet/API/system . collections . stack . clear？视图=netframework-4.7.2

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