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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
Updated on 16-Dec-2019 09:45:47
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