Question

How to create and use nested Lists (jagged list) in C#

Answer 1

using System;
using System.Collections.Generic;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            List<List<int>> list = new List<List<int>>();

            var rand = new Random();
            for (int i = 0; i < 5; i++)
            {
                List<int> sublist = new List<int>();
                int len = rand.Next(1, 13); // sub list size
                for (int j = 0; j < len; j++)
                {
                    sublist.Add(rand.Next(1, 10));
                }
                list.Add(sublist);
            }

            int totalItems = 0;
            foreach (var sublist in list)
            {
                totalItems += sublist.Count;
            }
            Console.WriteLine("total Items:" + totalItems);

            PrintList(list);
        }

        static void PrintList(List<List<int>> list)
        {
            foreach (var sublist in list)
            {
                foreach (var n in sublist)
                {
                    Console.Write(n + " ");
                }
                Console.WriteLine();
            }
        }
    }
}


/*
run:
  
total Items:36
1 5 7 8 1 3
7 2 9 4 2 1 8 2 7 4 5
1 2 2 3
9 2 7 7 8 9 3 9
6 9 3 5 3 5 8
 
*/

 

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