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UnionWith Method in C#
Use the UnionWith method in C# to get the union of i.e. unique lements from two collections.
Let’s say the following are our Dictionary −
Dictionary < string, int > dict1 = new Dictionary < string, int > ();
dict1.Add("pencil", 1);
dict1.Add("pen", 2);
Dictionary < string, int > dict2 = new Dictionary < string, int > ();
dict2.Add("pen", 3);Now, use HashSet and UnionWith to get the union −
HashSet < string > hSet = new HashSet < string > (dict1.Keys); hSet.UnionWith(dict2.Keys);
The following is the complete code −
Example
using System;
using System.Collections.Generic;
public class Program {
public static void Main() {
Dictionary < string, int > dict1 = new Dictionary < string, int > ();
dict1.Add("pencil", 1);
dict1.Add("pen", 2);
Dictionary < string, int > dict2 = new Dictionary < string, int > ();
dict2.Add("pen", 3);
HashSet < string > hSet = new HashSet <string > (dict1.Keys);
hSet.UnionWith(dict2.Keys);
Console.WriteLine("Merged Dictionary...");
foreach(string val in hSet) {
Console.WriteLine(val);
}
}
}Output
Merged Dictionary... pencil pen
Updated on: 22-Jun-2020
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