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


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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(1,"One");
            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");
            }
            else
            {
                Console.WriteLine("The key is not found");
            }
            Console.ReadLine();
        }
        
    }
  
}
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