using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Dictionary<string, object> dict = new Dictionary<string, object>

        {

            { "clave1", 3.14 },          // Valor de tipo double

            { "clave2", (short)42 },     // Valor de tipo short

            { "clave3", "Hola mundo" },  // Valor de tipo string

            { "clave4", true }           // Valor de tipo booleano

        };

        Console.WriteLine(dict.GetValue<double>("clave1"));

        Console.WriteLine(dict.GetValue<short>("clave2"));

        Console.WriteLine(dict.GetValue<string>("clave3"));

        Console.WriteLine(dict.GetValue<bool>("clave4"));

    }

}

​

​

public static class DictionaryExtensions

{

  public static T GetValue<T>(this Dictionary<string, object> dictionary, string key)

  {

    if(!dictionary.ContainsKey(key)) return default;

​

    var t = typeof(T);

    t = Nullable.GetUnderlyingType(t) ?? t;

​

    var value = dictionary[key];

    return value == null ? default : (T)Convert.ChangeType(value, t);

  }

}