How to create a List of Lists in C# - Step by Step Examples

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How to create a List of Lists in C# ?

Answer

In C#, you can create a list of lists using the `List>` class and add lists as elements of the outer list.

✐ Examples

1 Create List of Lists

In this example,

We create two inner lists named list1 and list2.
We create an outer list named listOfLists of type List> and initialize it with the inner lists.
Finally, we print the list of lists to standard output.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> list1 = new List<int> { 1, 2, 3 };
        List<string> list2 = new List<string> { "a", "b", "c" };
        List<List<object>> listOfLists = new List<List<object>> { list1, list2 };
        foreach (var innerList in listOfLists)
        {
            foreach (var element in innerList)
            {
                Console.Write(element + " ");
            }
            Console.WriteLine();
        }
    }
}

Output

1 2 3 
a b c

2 Create List of Lists with Empty Inner Lists

In this example,

We create an empty outer list named listOfListsEmpty of type List>.
We create two empty inner lists named list3 and list4.
We use the Add method to add the inner lists list3 and list4 to the outer list listOfListsEmpty.
Finally, we print the list of lists with empty inner lists to standard output.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<List<object>> listOfListsEmpty = new List<List<object>>();
        List<object> list3 = new List<object>();
        List<object> list4 = new List<object>();
        listOfListsEmpty.Add(list3);
        listOfListsEmpty.Add(list4);
        foreach (var innerList in listOfListsEmpty)
        {
            foreach (var element in innerList)
            {
                Console.Write(element + " ");
            }
            Console.WriteLine();
        }
    }
}

Output

Summary

In this tutorial, we learned How to create a List of Lists in C# language with well detailed examples.

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How to create a List of Lists in C# - Step by Step Examples

How to create a List of Lists in C# ?

Answer

✐ Examples

1 Create List of Lists

C# Program

Output

2 Create List of Lists with Empty Inner Lists

C# Program

Output

Summary

More C# Lists Tutorials