C# Stack.Clear用法及代码示例

此方法(位于System.Collections命名空间下)用于从堆栈中删除所有对象。此方法会将“堆栈计数”设置为零，并且还会删除对集合元素中其他对象的引用。此方法是O(n)运算，其中n是Count。

用法:

public virtual void Clear ();

以下示例程序旨在说明上述方法的使用：

示例1:

// C# code to illustrate the 
// Stack.Clear Method 
using System; 
using System.Collections; 
  
class GFG { 
  
    // Driver code 
    public static void Main() 
    { 
  
        // Creating a Stack 
        Stack myStack = new Stack(); 
  
        // 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); 
    } 
}

输出：

Total number of elements in the Stack are : 6
Total number of elements in the Stack are : 0

示例2:

// C# code to illustrate the 
// Stack.Clear Method 
using System; 
using System.Collections; 
  
class GFG { 
  
    // Driver code 
    public static void Main() 
    { 
  
        // Creating a Stack 
        Stack myStack = new Stack(); 
  
        // 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); 
    } 
}

输出：

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?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.Clear 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。