[Edit]

C# / .NET - merge two Lists into HashSet

1 contributors

2 contributions

0 discussions

0 points

Created by:

Zeeshan-Peel

850

In this article, we would like to show you how to merge two Lists into HashSet in C#.

Quick solution:

xxxxxxxxxx
 
List<string> list1 = new List<string> { "A", "B", "C" };
List<string> list2 = new List<string> { "D", "B", "C" };
​
HashSet<string> alphabet = new HashSet<string>(list1);
​
alphabet.UnionWith(list2);

Practical example

Edit

In this example, we merge list1 and list2 Lists into alphabet HashSet using UnionWith() method.

xxxxxxxxxx
 
using System;
using System.Collections.Generic;
​
public class Program
{
    public static void Main()
    {
        List<string> list1 = new List<string> { "A", "B", "C" };
        List<string> list2 = new List<string> { "D", "B", "C" };
​
        // initialize hashset with list1 on creation
        HashSet<string> alphabet = new HashSet<string>(list1);
​
        // add list2
        alphabet.UnionWith(list2);
​
        // print items
        foreach (string item in alphabet)
            Console.WriteLine(item);
    }
}