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Union of two HashSet in C#
Let us see an example to get the Union of two HashSet
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("HashSet1 elements...");
foreach(int ele in set1){
Console.WriteLine(ele);
}
HashSet<int> set2 = new HashSet<int>();
set2.Add(100);
set2.Add(200);
set2.Add(300);
set2.Add(400);
set2.Add(500);
set2.Add(600);
Console.WriteLine("HashSet2 elements...");
foreach(int ele in set2){
Console.WriteLine(ele);
}
Console.WriteLine("Union...");
set1.UnionWith(set2);
foreach(int ele in set1){
Console.WriteLine(ele);
}
}
}Output
This will produce the following output −
HashSet1 elements... 100 200 300 400 500 600 HashSet2 elements... 100 200 300 400 500 600 Union... 100 200 300 400 500 600
Example
Let us now 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("HashSet1 elements...");
foreach(int ele in set1){
Console.WriteLine(ele);
}
HashSet<int> set2 = new HashSet<int>();
set2.Add(100);
set2.Add(250);
set2.Add(300);
Console.WriteLine("HashSet2 elements...");
foreach(int ele in set2){
Console.WriteLine(ele);
}
Console.WriteLine("Union...");
set1.UnionWith(set2);
foreach(int ele in set1){
Console.WriteLine(ele);
}
}
}Output
This will produce the following output −
HashSet1 elements... 100 200 300 400 500 600 HashSet2 elements... 100 250 300 Union... 100 200 300 400 500 600 250
Updated on: 09-Dec-2019
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