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Check if a HashSet contains the specified element in C#
To check if a HashSet contains the specified element, 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);
}
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("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 Elements in HashSet2 30 60 100 150 200 250 Do they share common elements? True Does HashSet1 has element 60? False Does HashSet2 has element 60? True
Example
Let us now see another example;
using System;
using System.Collections.Generic;
public class Demo {
public static void Main(){
HashSet<string> hashSet = new HashSet<string>();
hashSet.Add("Tim");
hashSet.Add("Jack");
hashSet.Add("Matt");
hashSet.Add("Steve");
hashSet.Add("David");
hashSet.Add("Kane");
hashSet.Add("Gary");
Console.WriteLine("Elements in HashSet");
foreach(string val in hashSet){
Console.WriteLine(val);
}
if (hashSet.Contains("Matt"))
Console.WriteLine("The element Matt is in the HashSet");
else
Console.WriteLine("The element Matt is not in the HashSet");
}
}Output
This will produce the following output −
Elements in HashSet Tim Jack Matt Steve David Kane Gary The element Matt is in the HashSet
Updated on: 04-Dec-2019
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