Stack.Clone() Method in C#

Last Updated : 05 Feb, 2019

This method is used to create a shallow copy of the Stack. It just creates a copy of the Stack. The copy will have a reference to a clone of the internal data array but not a reference to the original internal data array.

Syntax: public virtual object Clone ();

Return Value: The method returns an Object which is just the shallow copy of the Stack.

Example 1: Let’s see an example without using a Clone() method and directly copying a Stack using assignment operator ‘=’. In the below code, we can see even if we Pop() elements from myStack2, contents of myStack is also changed. This is because ‘=’ just assigns the reference of myStack to myStack2 and does not create any new Stack. But Clone() creates a new Stack.

   // C# program to Copy a Stack using  
// the assignment operator 
using System; 
using System.Collections; 
  
class GFG { 
  
    // Main Method 
    public static void Main(string[] args) 
    { 
  
        Stack myStack = new Stack(); 
        myStack.Push("C"); 
        myStack.Push("C++"); 
        myStack.Push("Java"); 
        myStack.Push("C#"); 
  
        // Creating a copy using the 
        // assignment operator. 
        Stack myStack2 = myStack;  
  
        // Removing top most element 
        myStack2.Pop();  
        PrintValues(myStack); 
    } 
  
    public static void PrintValues(IEnumerable myCollection) 
    { 
        // This method prints all 
        // the elements in the Stack. 
        foreach(Object obj in myCollection) 
            Console.WriteLine(obj); 
    } 
} 
 
  

Output:

  Java  C++  C

Example 2:

   // C# program to illustrate the use  
// of Stack.Clone() Method  
using System; 
using System.Collections; 
  
class MainClass { 
  
    // Main Method 
    public static void Main(string[] args) 
    { 
  
        Stack myStack = new Stack(); 
        myStack.Push("1st Element"); 
        myStack.Push("2nd Element"); 
        myStack.Push("3rd Element"); 
        myStack.Push("4th Element"); 
  
        // Creating copy using Clone() method 
        Stack myStack3 = (Stack)myStack.Clone();  
      
        // Removing top most element 
        myStack3.Pop();  
        PrintValues(myStack); 
    } 
  
    public static void PrintValues(IEnumerable myCollection) 
    { 
        // This method prints all the 
        // elements in the Stack. 
        foreach(Object obj in myCollection) 
            Console.WriteLine(obj); 
    } 
} 
 
  

Output:

  4th Element  3rd Element  2nd Element  1st Element

Reference:

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

Stack.Contains() Method in C#

mayukh Sengupta

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