How to Iterate over a Two Dimensional List in C# - Step by Step Examples

How to Iterate over a Two Dimensional List in C# ?

Answer

In C# using List, you can iterate over a Two-Dimensional List using nested foreach loops. The outer loop iterates over rows, and the inner loop iterates over elements in each row. This allows you to access and process each element in the 2D list.


✐ Examples

1 Iterate over a 2D List of Integers

In this example,

  1. We create a 2D list using List>, where each inner list represents a row.
  2. We use nested foreach loops to iterate over each row (inner list) and each element in the row.
  3. We access and process each element as needed within the loops.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<List<int>> matrix = new List<List<int>>()
        {
            new List<int>(){1, 2, 3},
            new List<int>(){4, 5, 6}
        };

        foreach (var row in matrix)
        {
            foreach (int val in row)
            {
                Console.WriteLine(val);
            }
        }
    }
}

Output

1
2
3
4
5
6

2 Iterate over a 2D List of Strings

In this example,

  1. We create a 2D list using List>, where each inner list represents a row of strings.
  2. We use nested foreach loops to iterate over each row (inner list) and each string in the row.
  3. We access and process each string as needed within the loops.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<List<string>> matrix = new List<List<string>>()
        {
            new List<string>{"apple", "banana"},
            new List<string>{"cherry", "orange"}
        };

        foreach (var row in matrix)
        {
            foreach (string str in row)
            {
                Console.WriteLine(str);
            }
        }
    }
}

Output

apple
banana
cherry
orange

Summary

In this tutorial, we learned How to Iterate over a Two Dimensional List in C# language with well detailed examples.


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