Close a file after using it with JSON

Question

I've found that function that correctly work for the JSON parse:

var objs = JObject.Load(new JsonTextReader(new StreamReader(JsonPath)))
                  .SelectTokens("*")
                  .Select(t => JsonConvert.DeserializeObject<Cars>(t.ToString()));

but it doesn't release the file after use it (so I can not use it for other function) ... I've tried to use the function Close, but seems not working over the object!

P.s. i've checked the previous open-one question, releated to this topic, but nobody talk about how to access to the object fileds, and seems the qeustion are different if we count that i have more than 1 object ... guess someone can explain better how it works ...

Answer 1

I recommend you to read your json data async because this method have overload that takes stream as an input, so you can read data in two strings of code like this:

ProjFolder\Program.cs

using System.IO;
using System.Text.Json;
using System.Threading.Tasks;
using StackOverflow.Models;

namespace StackOverflow
{
    class Program
    {
        static async Task Main(string[] args)
        {
            using var openStream = File.OpenRead(@"D:\Code\test.json");

            var result = await JsonSerializer.DeserializeAsync<Root>(openStream);

            // You need to get car2 Costo
            var costo = result.Car2.Costo;
        }
    }    
}

ProjFolder\Models\Root.cs

using System.Text.Json.Serialization;

namespace StackOverflow.Models
{
    public class Root
    {
        [JsonPropertyName("car1")]
        public Car Car1 { get; set; }

        [JsonPropertyName("car2")]
        public Car Car2 { get; set; }
    }
}

ProjFolder\Models\Car.cs

namespace StackOverflow.Models
{
    public class Car
    {
        public string CasaAutomobilistica { get; set; }
        public string Modello { get; set; }
        public string AnnoImmatricolazione { get; set; }
        public string Targa { get; set; }
        public int KM { get; set; }
        public bool Finanziamento { get; set; }
        public int Porte { get; set; }
        public int Costo { get; set; }
    }
}

{
    "car1": 
    {
        "CasaAutomobilistica": "Fiat",
        "Modello": "500",
        "AnnoImmatricolazione": "2017",
        "Targa": "AZ978AG",
        "KM": 120000,
        "Finanziamento" : true,
        "Porte" : 5,
        "Costo" : 6000
    },
    "car2":
    {
        "CasaAutomobilistica": "BMW",
        "Modello": "Serie 1",
        "AnnoImmatricolazione": "2019",
        "Targa": "BC978AG",
        "KM": 150000,
        "Finanziamento" : false,
        "Porte" : 3,
        "Costo" : 12000
    }
}