C# | Copy the Stack to an Array - GeeksforGeeks

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 Arrayusing 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);        }    }}
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Example 2:
// C# code to Copy the Stack to an Arrayusing 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);        }    }}
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Reference:
https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.stack-1.copyto?view=netframework-4.7.2
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