C# program to merge two Dictionaries

Set the two dictionaries −

Dictionary < string, int > dict1 = new Dictionary < string, int > (); dict1.Add("laptop", 1); dict1.Add("desktop", 2); Dictionary < string, int > dict2 = new Dictionary < string, int > (); dict2.Add("desktop", 3); dict2.Add("tablet", 4); dict2.Add("mobile", 5);

Now use HashSet and UnionWith() method to merge the two dictionaries −

HashSet < string > hSet = new HashSet < string > (dict1.Keys); hSet.UnionWith(dict2.Keys);

Here is the complete code −

Example

using System; using System.Collections.Generic; class Program {    static void Main() {       Dictionary < string, int > dict1 = new Dictionary < string, int > ();       dict1.Add("laptop", 1);       dict1.Add("desktop", 2);       Dictionary < string, int > dict2 = new Dictionary < string, int > ();       dict2.Add("desktop", 3);       dict2.Add("tablet", 4);       dict2.Add("mobile", 5);       HashSet < string > hSet = new HashSet < string > (dict1.Keys);       hSet.UnionWith(dict2.Keys);       Console.WriteLine("Merged Dictionary...");       foreach(string val in hSet) {          Console.WriteLine(val);       }    } }