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Creating array of lists and combining

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Visual Basic .NET

Creating array of lists and combining

Sahil Dev

10yAsked Jul 28, 2016, 12:58 PM754Visual Basic .NET

I want to do the following:

1)Create an array of 100 lists

So, I have:

List<int>[] a = new List<int>[100];

2)Next I do,

for(j=0; j<100;j++)
{
a[j] = new List<int>();
}

3) Next I add elements to each;

a[j].Add(3);
//and so on

4) Now I want to combine all the lists into a single list

I do not know how to do that

Please note that I cannot create a single list due to some algorithmic constarints.

Can anyone advise?

2 Replies

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Tapan Patel10y ago
You can do this in one line using linq.
List<int>x=a.SelectMany(i=>i.Select(j=>j)).ToList();
Where a is your array of list.

Please mark it as answer if that solves the issue.
Rajeesh Menoth10y ago
Hi,

You can use String.Join or foreach to print the all value in list.

Try this code :
using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        List<int>[] a = new List<int>[100];
        for (int j = 0; j < 100; j++)
        {
            a[j] = new List<int>();
            a[j].Add(3);
            a[j].Add(5);
        }

        Console.WriteLine(String.Join(" ", a[0]));
    }
}
Demo : https://dotnetfiddle.net/2ZGASb