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Stack.CopyTo() Method in C#

Last Updated : 04 Feb, 2019
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This method(comes under System.Collections namespace) is used to copy the Stack to an existing 1-D Array which starts from the specified array index. The elements are copied onto the array in last-in-first-out (LIFO) order, similar to the order of the elements returned by a succession of calls to Pop. This method is an O(n) operation, where n is Count. Syntax:
public void CopyTo (T[] array, int arrayIndex);
Parameters:
array: It is the one-dimensional Array that is the destination of the elements copied from Stack. The Array must have zero-based indexing. arrayIndex: It is the zero-based index in array at which copying begins.
Exceptions:
  • ArgumentNullException : If an array is null.
  • ArgumentOutOfRangeException : If the index is less than zero.
  • ArgumentException : If the array is multidimensional or the number of elements in the source Stack is greater than the available space from index to the end of the destination array.
  • InvalidCastException : If the type of the source Stack cannot be cast automatically to the type of the destination array.
Below given are some examples to understand the implementation in a better way: Example 1: CSHARP
// C# code to illustrate the
// Stack.CopyTo() 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("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: CSHARP
// C# code to illustrate the
// Stack.CopyTo() 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(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:

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