C# HashSet - c# - c# tutorial - c# net



What in C# Hashset ?

  • C# HashSet class can be used to store, remove or view elements.
  • It does not store duplicate elements.
  • It is suggested to use HashSet class if you have to store only unique elements.
  • It is found in System.Collections.Generic namespace.
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  • This is an optimized set collection. It helps eliminates duplicate strings or elements in an array. It is a set that hashes its contents.

Syntax:

[SerializableAttribute]
[HostProtectionAttribute(SecurityAction.LinkDemand, MayLeakOnAbort = true)]
public class HashSet<T> : ICollection<T>, IEnumerable<T>, IEnumerable, 
	ISerializable, IDeserializationCallback, ISet<T>, IReadOnlyCollection<T>
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C# HashSet<T> example

  • Let's see an example of generic HashSet<T> class that stores elements using Add() method and iterates elements using for-each loop.
using System;  
using System.Collections.Generic;  
  
public class HashSetExample  
{  
    public static void Main(string[] args)  
    {  
       // Create a set of strings  
        var names = new HashSet<string>();  
        names.Add("Sonoo");  
        names.Add("Ankit");  
       names.Add("Peter");  
        names.Add("Irfan");  
        names.Add("Ankit");//will not be added  
          
        // Iterate HashSet elements using foreach loop  
        foreach (var name in names)  
        {  
            Console.WriteLine(name);  
        }  
    }  
}  
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C# examples - Output :

Sonoo
Ankit
Peter
Irfan

C# HashSet<T> example 2:

  • Let's see another example of generic HashSet<T> class that stores elements using Collection initializer.
using System;  
using System.Collections.Generic;  
  
public class HashSetExample  
{  
    public static void Main(string[] args)  
    {  
        // Create a set of strings  
        var names = new HashSet<string>(){"Sonoo", "Ankit", "Peter", "Irfan"};  
          
        // Iterate HashSet elements using foreach loop  
        foreach (var name in names)  
        {  
            Console.WriteLine(name);  
        }  
    }  
}  
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C# examples - Output :

Sonoo
Ankit
Peter
Irfan

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