How to Initialize a Set in C# - Step by Step Examples

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How to Initialize a Set in C# ?

Answer

To initialize a set in C#, you can use the HashSet class and its constructor.

✐ Examples

1 Initialize Set with Elements

In this example,

We import the necessary namespace for HashSet by including the statement using System.Collections.Generic;.
We declare a HashSet variable named mySet to hold elements of type T.
We initialize mySet by invoking the constructor new HashSet() and passing an optional collection of initial elements.
The HashSet class provides methods to add, remove, and check for the presence of elements in the set.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        // Declare and initialize a set
        HashSet<int> mySet = new HashSet<int>();

        // mySet is now ready to be used as an empty set

        // Example usage:
        // Add elements to the set
        mySet.Add(1);
        mySet.Add(2);

        // Remove elements from the set
        mySet.Remove(2);

        // Check if an element is present in the set
        bool containsElement = mySet.Contains(1);

        Console.WriteLine("Is element 1 present in the set: " + containsElement);
    }
}

Output

Is element 1 present in the set: True

2 Initialize Empty Set

In this example,

We import the necessary namespace for HashSet by including the statement using System.Collections.Generic;.
We declare a HashSet variable named emptySet to hold elements of type T.
We initialize emptySet by invoking the constructor new HashSet() without passing any initial elements.
The HashSet class provides methods to add, remove, and check for the presence of elements in the set.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        // Declare and initialize an empty set
        HashSet<int> emptySet = new HashSet<int>();

        // emptySet is now ready to be used as an empty set

        // Example usage:
        // Add elements to the set
        emptySet.Add(5);

        // Remove elements from the set
        emptySet.Remove(5);

        // Check if an element is present in the set
        bool containsElement = emptySet.Contains(5);

        Console.WriteLine("Is element 5 present in the set: " + containsElement);
    }
}

Output

Is element 5 present in the set: False

Summary

In this tutorial, we learned How to Initialize a Set in C# language with well detailed examples.

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