How to Reverse a List in C# - Step by Step Examples

How to Reverse a List in C# ?

Answer

To reverse a list in C#, you can use the Reverse method from the List class or implement a custom reverse method using nested loops.

✐ Examples

1 Reverse a List Using the Reverse Method

In this example,

We create a list named numbers with integer values.
We call the Reverse method on the list object numbers.
The Reverse method reverses the order of elements in the list in place.
Finally, we print the reversed list to standard output.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
        numbers.Reverse();
        Console.WriteLine("Reversed list: " + string.Join(", ", numbers));
    }
}

Output

Reversed list: 5, 4, 3, 2, 1

2 Reverse a List Using a Custom Method

In this example,

We create a list named numbers with integer values.
We implement a custom method called ReverseList that takes a list as input.
Inside ReverseList, we use a nested loop where the outer loop iterates from the start to the middle of the list, and the inner loop performs the element swap.
The outer loop index i and the inner loop index j represent the positions of elements to be swapped.
We swap the elements at positions i and j until the loop reaches the middle of the list.
Finally, we print the reversed list to standard output.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
        ReverseList(numbers);
        Console.WriteLine("Reversed list: " + string.Join(", ", numbers));
    }

    static void ReverseList(List<int> list)
    {
        int count = list.Count;
        for (int i = 0; i < count / 2; i++)
        {
            int temp = list[i];
            list[i] = list[count - i - 1];
            list[count - i - 1] = temp;
        }
    }
}

Output

Reversed list: 5, 4, 3, 2, 1

Summary

In this tutorial, we learned How to Reverse a List in C# language with well detailed examples.

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How to Reverse a List in C# - Step by Step Examples

How to Reverse a List in C# ?

Answer

✐ Examples

1 Reverse a List Using the Reverse Method

C# Program

Output

2 Reverse a List Using a Custom Method

C# Program

Output

Summary

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