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C# / .NET - get random element from HashSet
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In this article, we would like to show you how to get random element from HashSet in C#.
In this example, we generate a random number between 0 and HashSet size. Then using iterator we iterate through the HashSet till we reach the element located at the randomNumber position.
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using System;2
using System.Linq;3
using System.Collections.Generic;4
5
public class Program6
{7
public static void Main()8
{9
HashSet<string> letters = new HashSet<string>();10
11
letters.Add("A");12
letters.Add("B");13
letters.Add("C");14
letters.Add("D");15
letters.Add("E");16
17
int size = letters.Count();18
int randomNumber = new Random().Next(size);19
int i = 0;20
21
foreach (string letter in letters)22
{23
if (i == randomNumber)24
Console.WriteLine(letter);25
i++;26
}27
}28
}Example output:
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BIn this example, we convert letters HashSet into an array and then access the random element from it.
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using System;2
using System.Linq;3
using System.Collections.Generic;4
5
public class Program6
{7
public static void Main()8
{9
HashSet<string> letters = new HashSet<string>();10
11
letters.Add("A");12
letters.Add("B");13
letters.Add("C");14
letters.Add("D");15
letters.Add("E");16
17
Random random = new Random();18
string[] asArray = letters.ToArray();19
string randomLine = asArray[random.Next(asArray.Length)];20
21
Console.WriteLine(randomLine);22
}23
}Example output:
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A