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Remove the specified element from a HashSet in C#
To remove the specified element from a HashSet, the code is as follows −
Example
using System;
using System.Collections.Generic;
public class Demo {
public static void Main(){
HashSet<string> set1 = new HashSet<string>();
set1.Add("AB");
set1.Add("CD");
set1.Add("EF");
set1.Add("AB");
set1.Add("IJ");
set1.Add("KL");
set1.Add("EF");
set1.Add("OP");
Console.WriteLine("Elements in HashSet1");
foreach(string val in set1){
Console.WriteLine(val);
}
HashSet<string> set2 = new HashSet<string>();
set2.Add("EF");
set2.Add("KL");
Console.WriteLine("Elements in HashSet2");
foreach(string val in set2){
Console.WriteLine(val);
}
Console.WriteLine("Count of elements in HashSet2 = " + set2.Count);
set2.Remove("KL");
Console.WriteLine("
Elements in HashSet2... (UPDATED)");
foreach (string res in set2){
Console.WriteLine(res);
}
Console.WriteLine("Count of elements in HashSet2 (Updated) = " + set2.Count);
Console.WriteLine("
Is set1 a superset of set2? "+set1.IsSupersetOf(set2));
}
}Output
This will produce the following output −
Elements in HashSet1 AB CD EF IJ KL OP Elements in HashSet2 EF KL Count of elements in HashSet2 = 2 Elements in HashSet2... (UPDATED) EF Count of elements in HashSet2 (Updated) = 1 Is set1 a superset of set2? True
Example
Let us see another example −
using System;
using System.Collections.Generic;
public class Demo {
public static void Main(){
HashSet<int> set1 = new HashSet<int>();
set1.Add(100);
set1.Add(200);
set1.Add(300);
set1.Add(400);
set1.Add(500);
set1.Add(600);
Console.WriteLine("Elements in HashSet");
foreach(int val in set1){
Console.WriteLine(val);
}
Console.WriteLine("Count of elements in HashSet = " + set1.Count);
set1.Remove(300);
Console.WriteLine("
Elements in HashSet... (UPDATED)");
foreach (int res in set1){
Console.WriteLine(res);
}
Console.WriteLine("Count of elements in HashSet (Updated) = " + set1.Count);
}
}Output
This will produce the following output −
Elements in HashSet 100 200 300 400 500 600 Count of elements in HashSet = 6 Elements in HashSet... (UPDATED) 100 200 400 500 600 Count of elements in HashSet (Updated) = 5
Updated on: 06-Dec-2019
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