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

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,

  1. We import the necessary namespace for HashSet by including the statement using System.Collections.Generic;.
  2. We declare a HashSet variable named mySet to hold elements of type T.
  3. We initialize mySet by invoking the constructor new HashSet() and passing an optional collection of initial elements.
  4. 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,

  1. We import the necessary namespace for HashSet by including the statement using System.Collections.Generic;.
  2. We declare a HashSet variable named emptySet to hold elements of type T.
  3. We initialize emptySet by invoking the constructor new HashSet() without passing any initial elements.
  4. 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.


More C# Sets Tutorials

  1. How to create an Empty Set in C# ?
  2. How to Initialize a Set in C# ?
  3. How to Get Length of a Set in C# ?
  4. How to create a Set of size N in C# ?
  5. How to create a Set of Numbers from 1 to N in C# ?
  6. How to create a Set of integers in C# ?
  7. How to create a Set of Strings in C# ?
  8. How to Access Items in a Set in C# ?
  9. How to get a Random Item in a Set in C# ?
  10. How to Iterate Over a Set in C# ?
  11. How to check if a Set is Empty in C# ?
  12. How to check if a Set is Not Empty in C# ?
  13. How to get Subset from a Set in C# ?
  14. How to check if a Specific Item is present in the Set in C# ?
  15. How to check if a Set contains all the items of Another Set in C# ?
  16. How to Sort Items of a Set in C# ?
  17. How to Copy a Set in C# ?
  18. How to add an Item to a Set in C# ?
  19. How to find Union of Two Sets in C# ?
  20. How to find Intersection of Two Sets in C# ?
  21. How to check if Two Sets are Equal in C# ?
  22. How to Convert a Set of Integers to a Set of Strings in C# ?
  23. How to Convert a Set of Strings to a Set of Integers in C# ?
  24. How to Convert a Set of Floats to a Set of Strings in C# ?
  25. How to Convert a Set of Strings to a Set of Floats in C# ?
  26. How to Filter Items of a Set based on a Condition in C# ?
  27. How to Remove Specific Item from a Set in C# ?
  28. How to Remove Items from Set based on a Condition in C# ?
  29. How to create a Set of Sets in C# ?