How to get the index of the current iteration in a foreach loop.

Using an index variable.

Create an index variable and initialize it to 0. Then increment its value with each iteration.


using System;
using System.Collections.Generic;

public class IndexOfIteration
{
    public static void Main()
    {
        var numbers = new List<int>() { 1, 2, 3, 4, 8, 10 };
        int index = 0;
        
        foreach (var number in numbers)
        {
            Console.WriteLine($"Index: {index}. Value: {number}");
            index++;
        }
    }
}

Using LINQ Select().

With Select() create a list of values paired with index values. Then use the index while running the foreach loop.


using System;
using System.Linq;
using System.Collections.Generic;

public class IndexOfIteration
{
    public static void Main()
    {
        var numbers = new List<int>() { 1, 2, 3, 4, 8, 10 };

        var items = numbers.Select((value, index) => new { value, index });

        foreach (var item in items)
        {
            Console.WriteLine($"Index: {item.Index}. Value: {item.Value}");
        }
    }
}

Jack Poorte

Last updated on Sep 30, 2023