Question

How to convert nested list to array in C#

Answer 1

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<List<int>> nestedList = new List<List<int>>         {
            new List<int> { 1, 2, 3 },
            new List<int> { 4, 5, 6 },
            new List<int> { 7, 8, 9 }
        };

        // Convert the nested list to a 2D array
        int[,] array = ConvertNestedListToArray(nestedList);

        for (int i = 0; i < array.GetLength(0); i++) {
            for (int j = 0; j < array.GetLength(1); j++) {
                Console.Write(array[i, j] + " ");
            }
            Console.WriteLine();
        }
    }

    static int[,] ConvertNestedListToArray(List<List<int>> nestedList) {
        // Get the number of rows and columns
        int rows = nestedList.Count;
        int cols = nestedList[0].Count;

        // Initialize the 2D array
        int[,] array = new int[rows, cols];

        // Populate the array with values from the nested list
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                array[i, j] = nestedList[i][j];
            }
        }

        return array;
    }
}

 
/*
run:
     
1 2 3 
4 5 6 
7 8 9 
 
*/

 

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