Stack.GetEnumerator Method in C# (original) (raw)

Last Updated : 04 Feb, 2019

This method returns an IEnumerator that iterates through the Stack. And it comes under the System.Collections namespace.Syntax:

public virtual System.Collections.IEnumerator GetEnumerator ();

Below programs illustrate the use of above-discussed method:Example 1:

csharp `

// C# program to illustrate the // Stack.GetEnumerator 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");

    // To get an Enumerator
    // for the Stack
    IEnumerator enumerator = myStack.GetEnumerator();

    // If MoveNext passes the end of the
    // collection, the enumerator is positioned
    // after the last element in the Stack
    // and MoveNext returns false.
    while (enumerator.MoveNext()) {

        Console.WriteLine(enumerator.Current);
    }
}

}

Output:

GeeksforGeeks Data Structures Noida Geeks Classes Geeks

Example 2:

csharp `

// C# code to illustrate the // Stack.GetEnumerator 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);

    // To get an Enumerator
    // for the Stack
    IEnumerator enumerator = myStack.GetEnumerator();

    // If MoveNext passes the end of the
    // collection, the enumerator is positioned
    // after the last element in the Stack
    // and MoveNext returns false.
    while (enumerator.MoveNext()) {

        Console.WriteLine(enumerator.Current);
    }
}

}

Note:

The _foreach _statement of the C# language hides the complexity of the enumerators. Therefore, using foreach is recommended, instead of directly manipulating the enumerator.
Enumerators can be used to read the data in the collection, but they cannot be used to modify the underlying collection.
Current returns the same object until either MoveNext or Reset is called. MoveNext sets Current to the next element.
An enumerator remains valid as long as the collection remains unchanged. If changes are made to the collection, such as adding, modifying, or deleting elements, the enumerator is irrecoverably invalidated and its behavior is undefined.
This method is an O(1) operation.

Reference:

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

Stack.GetEnumerator Method in C# (original) (raw)

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