How to Get the Dictionary Key by value in C# ?

Published on February 7, 2016 by abundantcode

Filed under C#

Last modified February 6, 2016

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If you want to get the Key of a dictionary based on the value in C# , you can use the LINQ’s where clause o FirstOrDefault method.

How to Get the Dictionary Key by value in C# ?

using System;
using System.Collections.Generic;
using System.Linq;

namespace ACCode
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<string, string> dictionaryItems= new Dictionary<string, string>()
            {
                {"1", "One"},
                {"2", "Two"},
                {"3", "Three"},
                {"4", "Three"},
                {"5", "Three"}
            };
            var dictValue = dictionaryItems.FirstOrDefault(x => x.Value == "Three").Key;
            Console.WriteLine(dictValue);
            Console.ReadLine();
        }       
    } 
}

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