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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
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