How Can I Iterate Through Multiple Lists Simultaneously Using a Single ForEach Loop in C#?

Iterating Multiple Lists with a Unified ForEach Loop in C#

In C#, one may encounter scenarios where iterating over multiple lists simultaneously with a single foreach loop is desired. This article explores a solution to this problem using the Zip operation introduced in .NET 4.

The Zip operation enables developers to combine elements from multiple sequences into a single sequence, allowing for paired iteration. Consider the following example:

List<string> listA = new List<string> { "string", "string" };
List<string> listB = new List<string> { "string", "string" };

To iterate over both lists simultaneously, one could employ the following code:

var numbersAndWords = numbers.Zip(words, (n, w) => new { Number = n, Word = w });
foreach (var nw in numbersAndWords)
{
    Console.WriteLine(nw.Number + nw.Word);
}

Alternatively, tuples can be used to avoid named fields:

foreach (var nw in numbers.Zip(words, Tuple.Create)) 
{
    Console.WriteLine(nw.Item1 + nw.Item2);
}

The Zip operation streamlines the process of iterating over multiple lists, providing a concise solution for scenarios where simultaneous iteration is required.

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