Creating array of lists and combining

Question

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?

Tapan Patel · Answer

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 Menoth · Answer

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 { a[j] = new List int >(); a[j].Add(3); a[j].Add(5); } Console.WriteLine(String.Join(    a[0])); } } Demo : https://dotnetfiddle.net/2ZGASb