How to Get Every Nth Item from a List in C#?

Getting Every Nth Item from a List

Obtaining every nth item from a list is a common operation in programming. Whether you're working with .NET 3.5 or a more recent version, there are various approaches to achieve this functionality.

Lambda Expression Approach

Lambda expressions provide a concise way to filter data in .NET. In this case, you can use a lambda expression to check whether the index of each item is divisible by the desired increment (n). The following code snippet demonstrates this approach:

using System.Collections.Generic;

class Program
{
    static void Main()
    {
        // Create a List<int> with some sample data
        List<int> list = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

        // Obtain every 3rd item
        int n = 3;
        var everyNthItem = list.Where((x, i) => i % n == 0);

        // Print the resulting list
        Console.WriteLine(string.Join(",", everyNthItem));
    }
}

LINQ Approach

Alternatively, you can use the LINQ (Language Integrated Query) syntax to achieve the same result. LINQ provides a more domain-specific language for querying data in .NET. The following code snippet shows how to use LINQ in this context:

using System.Linq;

class Program
{
    static void Main()
    {
        // Create a List<int> with some sample data
        List<int> list = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

        // Obtain every 3rd item
        int n = 3;
        var everyNthItem = list.Where((x, i) => i % n == 0);

        // Print the resulting list
        Console.WriteLine(string.Join(",", everyNthItem));
    }
}

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