C# Stack.Pop()用法及代码示例

此方法(位于System.Collections命名空间下)用于删除并返回堆栈顶部的对象。此方法与Peek方法相似，但是Peek不会修改堆栈。

用法:

public virtual object Pop ();

返回值：它返回从堆栈顶部删除的对象。

异常：如果堆栈为空，则此方法将提供InvalidOperationException。

以下示例程序旨在说明上述方法的用法：

示例1:

// C# Program to illustrate the  
// use of Stack.Pop() Method 
using System; 
using System.Collections; 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
  
        // Creating a Stack 
        Stack myStack = new Stack(); 
  
        // Inserting the elements into the Stack 
        myStack.Push("Geeks"); 
        myStack.Push("Geeks Classes"); 
        myStack.Push("Noida"); 
        myStack.Push("Data Structures"); 
        myStack.Push("GeeksforGeeks"); 
  
        Console.WriteLine("Number of elements in the Stack: {0}", 
                                                 myStack.Count); 
  
        // Retrieveing top element of Stack 
        Console.Write("Top element of Stack is: "); 
        Console.Write(myStack.Pop()); 
  
        // printing the no of Stack element 
        // after Pop operation 
        Console.WriteLine("\nNumber of elements in the Stack: {0}", 
                                                    myStack.Count); 
    } 
}

输出：

Number of elements in the Stack: 5
Top element of Stack is: GeeksforGeeks
Number of elements in the Stack: 4

示例2:

// C# Program to illustrate the  
// use of Stack.Pop() Method 
using System; 
using System.Collections; 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
  
        // Creating a Stack 
        Stack myStack = new Stack(); 
  
        // Inserting the elements into the Stack 
        myStack.Push(7); 
        myStack.Push(9); 
  
        Console.WriteLine("Number of elements in the Stack: {0}", 
                                                 myStack.Count); 
  
        // Retrieveing top element of Stack 
        Console.Write("Top element of Stack is: "); 
        Console.Write(myStack.Pop()); 
  
        // printing the no of Stack element 
        // after Pop operation 
        Console.WriteLine("\nNumber of elements in the Stack: {0}", 
                                                    myStack.Count); 
    } 
}

输出：

Number of elements in the Stack: 2
Top element of Stack is: 9
Number of elements in the Stack: 1

参考：

https://docs.microsoft.com/en-us/dotnet/api/system.collections.stack.pop?view=netframework-4.7.2

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注：本文由纯净天空筛选整理自Kirti_Mangal大神的英文原创作品 Stack.Pop() Method in C#。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。