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Number of elements in HashSet in C#?
To get the number of elements in HashSet in C#, the code is as follows −
Example
using System; using System.Collections.Generic; public class Demo { public static void Main() { HashSet<int> set1 = new HashSet<int>(); set1.Add(25); set1.Add(50); set1.Add(75); set1.Add(100); set1.Add(125); set1.Add(150); Console.WriteLine("Elements in HashSet1"); foreach(int val in set1) { Console.WriteLine(val); } Console.WriteLine("Number of elements in HashSet1 = "+set1.Count); HashSet<int> set2 = new HashSet<int>(); set2.Add(30); set2.Add(60); set2.Add(100); set2.Add(150); set2.Add(200); set2.Add(250); Console.WriteLine("Elements in HashSet2"); foreach(int val in set2) { Console.WriteLine(val); } Console.WriteLine("Number of elements in HashSet2 = "+set2.Count); Console.WriteLine("Do they share common elements? "+set1.Overlaps(set2)); Console.WriteLine("Does HashSet1 has element 60? "+set1.Contains(60)); Console.WriteLine("Does HashSet2 has element 60? "+set2.Contains(60)); } }
Output
This will produce the following output −
Elements in HashSet1 25 50 75 100 125 150 Number of elements in HashSet1 = 6 Elements in HashSet2 30 60 100 150 200 250 Number of elements in HashSet2 = 6 Do they share common elements? True Does HashSet1 has element 60? False Does HashSet2 has element 60? True
Example
Let us see another 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); } Console.WriteLine("Number of elements in HashSet1 = "+set1.Count); HashSet<string> set2 = new HashSet<string>(); set2.Add("EF"); set2.Add("KL"); Console.WriteLine("Number of elements in HashSet2 = "+set2.Count); Console.WriteLine("Elements in HashSet2"); foreach(string val in set2) { Console.WriteLine(val); } 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 Number of elements in HashSet1 = 6 Number of elements in HashSet2 = 2 Elements in HashSet2 EF KL Is set1 a superset of set2? True
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