using System;

using System.Text.Json;

public class Program

{

    public static void Main()

    {

        Console.WriteLine($"{Parse<int>("1")}");

        Console.WriteLine($"{Parse<decimal>("1.3200056")}");

        Console.WriteLine($"{Parse<string>("just a string")}");

        Console.WriteLine($"{Parse<C1>("{\"P1\": \"a string\", \"P2\": 3}")}");

    }

    public class C1

    {

        public string P1 { get; set; }

        public int P2 { get; set; }

        public override string ToString()

        {

            return $"P1: \"{P1}\" - P2: {P2}";

        }

    }

    public static T Parse<T>(string val)

    {

        if (typeof(T) == typeof(string) || typeof(T).IsValueType)

        {

            return (T)Convert.ChangeType(val, typeof(T));

        }

        return JsonSerializer.Deserialize<T>(val);

    }

​

}