How to detect if a key exists in a Dictionary in C# ?

Published on January 26, 2016 by Senthil Kumar

Filed under C#

Last modified January 26, 2016

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If you want to detect if a key exists in a dictionary in C# , you can use the contains method of the dictionary which return true if the key is found.

How to detect if a key exists in a Dictionary in C# ?

Below is a sample source code that illustrates how to find out if the exists in a dictionary using the contains method in C#.

using System;
using System.Collections.Generic;

namespace ACCode
    class Program
        static void Main(string[] args)
            Dictionary<int,string> Numbers = new Dictionary<int, string>();
            Numbers.Add(2, "Two");
            Numbers.Add(3, "Three");
            Numbers.Add(4, "Four");
            Numbers.Add(5, "Five");
            if (Numbers.ContainsKey(7))
                Console.WriteLine("The Key is found");
                Console.WriteLine("The key is not found");

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