Using HashSet to remove duplicates from array in C#

Published on May 10, 2016 by abundantcode

Filed under Collections

Last modified May 10, 2016

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If you want to remove duplicates from an array in C# , one of the options is to use HashSet as shown below.

How to remove duplicates from an array in C# using HashSet?


using System;
using System.Collections.Generic;
namespace ACConsoleApp
    class Program
        public static int[] RemoveDuplicates(int[] input)
            HashSet<int> hashSet = new HashSet<int>(input);
            int[] result = new int[hashSet.Count];
            return result;
        static void Main(string[] args)
            int[] inputArray = new[] {1, 5, 2, 6, 1, 4, 2};
            var result = RemoveDuplicates(inputArray);
            for(int i=0 ;i<result.Length;i++)
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