using System.Text.Json;

using System;                   

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Convert<int[]>("[1, 2,3]").GetType().FullName);

        Console.WriteLine(Convert<string>("\"123\"").GetType().FullName);

    }

    static T Convert<T> (string message) {

        return JsonSerializer.Deserialize<T>(message);  

    }

}