How to Remove Duplicates in an Array in C# - Step by Step Examples

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How to Remove Duplicates in an Array in C# ?

Answer

To remove duplicates from an array in C#, you can use LINQ or loops with a HashSet.

✐ Examples

1 Remove Duplicates using LINQ

In this example,

We create an array named `numbers` with duplicate integers.
We use LINQ's `Distinct()` method to filter out duplicates.
Finally, we get an array without duplicates using LINQ.

C# Program

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        int[] numbers = { 1, 2, 2, 3, 4, 4, 5 };
        var uniqueNumbers = numbers.Distinct().ToArray();
        Console.WriteLine("Array without duplicates: " + string.Join(", ", uniqueNumbers));
    }
}

Output

Array without duplicates: 1, 2, 3, 4, 5

2 Remove Duplicates using HashSet

In this example,

We create an array named `colors` with duplicate strings.
We use a HashSet to filter out duplicate elements.
Finally, we get an array without duplicates using HashSet.

C# Program

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        string[] colors = { "red", "green", "blue", "green", "yellow", "blue" };
        var uniqueColors = new HashSet<string>(colors).ToArray();
        Console.WriteLine("Array without duplicates: " + string.Join(", ", uniqueColors));
    }
}

Output

Array without duplicates: red, green, blue, yellow

Summary

In this tutorial, we learned How to Remove Duplicates in an Array in C# language with well detailed examples.

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How to Remove Duplicates in an Array in C# - Step by Step Examples

How to Remove Duplicates in an Array in C# ?

Answer

✐ Examples

1 Remove Duplicates using LINQ

C# Program

Output

2 Remove Duplicates using HashSet

C# Program

Output

Summary

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