C# / .NET - add items to HashSet

In this article, we would like to show you how to add items to HashSet in C#.

Quick solution:

HashSet<string> myHashset = new HashSet<string>();

myHashset.Add("A");

Practical example

In this example, we add three elements to myHashset using Add() method.

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        HashSet<string> myHashset = new HashSet<string>();

        myHashset.Add("A");
        myHashset.Add("B");
        myHashset.Add("C");

        foreach (string item in myHashset)
            Console.WriteLine(item);
    }
}

Output:

A
B
C

2. Add items on creation

In this example, we present how to add items while creating HashSet.

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        HashSet<string> myHashset = new HashSet<string> { "A", "B", "C" };

        foreach (string item in myHashset)
            Console.WriteLine(item);
    }
}

Output:

A
B
C

References

1. HashSet<T>.Add(T) Method (System.Collections.Generic) | Microsoft Docs