How to check if a Specific Item is present in the Set in C# - Step by Step Examples

How to check if a Specific Item is present in the Set in C# ?

Answer

To check if a specific item is present in a Set in C#, you can use the Contains method of the HashSet class.


✐ Examples

1 Check if an Item is Present in a Set of Integers

In this example,

  1. We create a HashSet named numbers and initialize it with some integer elements.
  2. We define an integer variable itemToCheck with the value of the item we want to check for.
  3. We use the Contains method of the numbers set to check if itemToCheck is present in the set.
  4. The Contains method returns a boolean value: true if the item is present, and false if it is not.
  5. We print the result to the console to verify whether the item is present in the set.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        HashSet<int> numbers = new HashSet<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
        int itemToCheck = 5;
        bool containsItem = numbers.Contains(itemToCheck);
        Console.WriteLine($"Does the set contain {itemToCheck}? {containsItem}");
    }
}

Output

Does the set contain 5? True

2 Check if an Item is Present in a Set of Strings

In this example,

  1. We create a HashSet named fruits and initialize it with some string elements.
  2. We define a string variable itemToCheck with the value of the item we want to check for.
  3. We use the Contains method of the fruits set to check if itemToCheck is present in the set.
  4. The Contains method returns a boolean value: true if the item is present, and false if it is not.
  5. We print the result to the console to verify whether the item is present in the set.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        HashSet<string> fruits = new HashSet<string> { "apple", "banana", "cherry", "date", "fig" };
        string itemToCheck = "cherry";
        bool containsItem = fruits.Contains(itemToCheck);
        Console.WriteLine($"Does the set contain '{itemToCheck}'? {containsItem}");
    }
}

Output

Does the set contain 'cherry'? True

Summary

In this tutorial, we learned How to check if a Specific Item is present in the Set in C# language with well detailed examples.


More C# Sets Tutorials

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  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# ?