How to check if a Set contains all the items of Another Set in C# - Step by Step Examples

How to check if a Set contains all the items of Another Set in C# ?

Answer

To check if a set contains all the items of another set in C#, you can use the IsSubsetOf method of the HashSet class.

✐ Examples

1 Check if One Set of Integers is a Subset of Another Set

In this example,

We create two sets named setA and setB and initialize them with some integer elements.
We use the IsSubsetOf method of setA to check if all elements in setB are also present in setA.
The IsSubsetOf method returns a boolean value: true if setB is a subset of setA, and false otherwise.
We print the result to the console to verify whether setA contains all elements of setB.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        HashSet<int> setA = new HashSet<int> {1, 2, 3, 4, 5};
        HashSet<int> setB = new HashSet<int> {2, 3};
        bool isSubset = setA.IsSubsetOf(setB);
        Console.WriteLine($"Does setA contain all elements of setB? {isSubset}");
    }
}

Output

Does setA contain all elements of setB? false

2 Check if One Set of Strings is a Subset of Another Set

In this example,

We create two sets named setA and setB and initialize them with some string elements.
We use the IsSubsetOf method of setA to check if all elements in setB are also present in setA.
The IsSubsetOf method returns a boolean value: true if setB is a subset of setA, and false otherwise.
We print the result to the console to verify whether setA contains all elements of setB.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        HashSet<string> setA = new HashSet<string> {"apple", "banana", "cherry"};
        HashSet<string> setB = new HashSet<string> {"banana", "cherry"};
        bool isSubset = setA.IsSubsetOf(setB);
        Console.WriteLine($"Does setA contain all elements of setB? {isSubset}");
    }
}

Output

Does setA contain all elements of setB? false

Summary

In this tutorial, we learned How to check if a Set contains all the items of Another Set in C# language with well detailed examples.

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