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Categories / C# / Collections Data Structure

 

ContainsKey can be used to test keys before inserting them

using System; using System.Collections.Generic; public class Example {     public static void Main()     {         Dictionary<string, string> openWith = new Dictionary<string, string>();         openWith.Add("A", "a");         openWith.Add("B", "b");         openWith.Add("C", "c");         if (!openWith.ContainsKey("W"))         {             openWith.Add("W", "w");             Console.WriteLine("Value added ");         }    } }