C# | Intersection of SortedSet with a collection

Last Updated : 11 Jul, 2025

SortedSet class represents the collection of objects in sorted order. This class comes under the System.Collections.Generic namespace. SortedSet<T>.IntersectWith(IEnumerable<T>) method is used to modify the current SortedSet<T> object so that it contains only elements that are also in a specified collection. Properties:

In C#, SortedSet class can be used to store, remove or view elements.
It maintains ascending order and does not store duplicate elements.
It is suggested to use SortedSet class if you have to store unique elements and maintain ascending order.

Syntax:

mySortedSet1.IntersectWith(mySortedSet2);

Here, mySortedSet1 and mySortedSet2 are two SortedSet's object. Exception: This method will give ArgumentNullException if the SortedSet is null. Below given are some examples to understand the implementation in a better way: Example 1:

CSHARP

// C# code to get the Intersection of 2 SortedSets
using System;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a SortedSet of integers
        SortedSet<int> mySortedSet1 = new SortedSet<int>();

        // adding elements in mySortedSet1
        mySortedSet1.Add(2);
        mySortedSet1.Add(4);
        mySortedSet1.Add(6);
        mySortedSet1.Add(8);
        mySortedSet1.Add(10);

        // Creating a SortedSet of integers
        SortedSet<int> mySortedSet2 = new SortedSet<int>();

        // adding elements in mySortedSet
        mySortedSet2.Add(4);
        mySortedSet2.Add(5);
        mySortedSet2.Add(7);
        mySortedSet2.Add(8);
        mySortedSet2.Add(9);

        Console.WriteLine("The intersection of mySortedSet1 and mySortedSet2:");

        mySortedSet1.IntersectWith(mySortedSet2);

        // To display the intersection 
        // of mySortedSet1 and mySortedSet2
        foreach(int i in mySortedSet1)
        {
            Console.WriteLine(i);
        }
    }
}

Output:

The intersection of mySortedSet1 and mySortedSet2: 
4
8

Example 2:

CSHARP

// C# code to get the Intersection of 2 SortedSets
using System;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a SortedSet of strings
        SortedSet<string> mySortedSet1 = new SortedSet<string>();

        // adding elements in mySortedSet1
        mySortedSet1.Add("Geeks");
        mySortedSet1.Add("for");
        mySortedSet1.Add("Geeks");
        mySortedSet1.Add("Noida");
        mySortedSet1.Add("Data Structures");

        // Creating a SortedSet of strings
        SortedSet<string> mySortedSet2 = new SortedSet<string>();

        // adding elements in mySortedSet
        mySortedSet2.Add("Geeks");
        mySortedSet2.Add("Java");
        mySortedSet2.Add("Geeks Classes");
        mySortedSet2.Add("C++");
        mySortedSet2.Add("Noida");

        Console.WriteLine("The Intersection of mySortedSet1 and mySortedSet2:");

        mySortedSet1.IntersectWith(mySortedSet2);

        // To display the intersection of
        // mySortedSet1 and mySortedSet2
        foreach(string str in mySortedSet1)
        {
            Console.WriteLine(str);
        }
    }
}

Output:

The Intersection of mySortedSet1 and mySortedSet2 is: 
Geeks
Noida

Reference:

https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.sortedset-1.intersectwith?view=netcore-2.1

C# | Union of SortedSet to a collection

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C# | Intersection of SortedSet with a collection

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