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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
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