C# | Copy the Stack to an Array

Last Updated : 01 Feb, 2019

Stack<T>.CopyTo(T[], Int32) Method is used to copy the Stack<T> to an existing 1-D Array which starts from the specified array index.

Properties:

The capacity of a Stack<T>is the number of elements the Stack<T> can hold. As elements are added to a Stack<T> , the capacity is automatically increased as required through reallocation.
If Count is less than the capacity of the Stack<T> , Push is an O(1) operation. If the capacity needs to be increased to accommodate the new element, Push becomes an O(n) operation, where n is Count. Pop is an O(1) operation.
Stack accepts null as a valid value and allows duplicate elements.

Syntax:

  public void CopyTo (T[] array, int arrayIndex);

Parameters:

array: The one-dimensional Array that is the destination of the elements copied from Stack<T>. The Array must have zero-based indexing.

arrayIndex: The zero-based index in array at which copying begins.

Exceptions:

ArgumentNullException : If an array is null.
ArgumentOutOfRangeException : If the arrayIndex is less than zero.
ArgumentException : The number of elements in the source Stack<T> is greater than the available space from arrayIndex to the end of the destination array.

Below given are some examples to understand the implementation in a better way:

Example 1:

   // C# code to Copy the Stack to an Array 
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("Geeks"); 
        myStack.Push("Geeks Classes"); 
        myStack.Push("Noida"); 
        myStack.Push("Data Structures"); 
        myStack.Push("GeeksforGeeks"); 
  
        // Creating a string array arr 
        string[] arr = new string[myStack.Count]; 
  
        // Copying the elements of stack into array arr 
        myStack.CopyTo(arr, 0); 
  
        // Displaying the elements in array arr 
        foreach(string str in arr) 
        { 
            Console.WriteLine(str); 
        } 
    } 
} 
 
  

Output:

  GeeksforGeeks  Data Structures  Noida  Geeks Classes  Geeks

Example 2:

   // C# code to Copy the Stack to an Array 
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(2); 
        myStack.Push(3); 
        myStack.Push(4); 
        myStack.Push(5); 
        myStack.Push(6); 
  
        // Creating an Integer array arr 
        int[] arr = new int[myStack.Count]; 
  
        // Copying the elements of stack into array arr 
        myStack.CopyTo(arr, 0); 
  
        // Displaying the elements in array arr 
        foreach(int i in arr) 
        { 
            Console.WriteLine(i); 
        } 
    } 
} 
 
  

Output:

  6  5  4  3  2

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.stack-1.copyto?view=netframework-4.7.2

C# | Get object at the top of the Stack - Peek operation

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C# | Copy the Stack to an Array

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