如何按部分将 JSON 文件反序列化为 C# object

Question

I have 2 C# class:

public class Light
{
    public int Brightness { get; set; }
    public string Mode { get; set; }
}

public class AirConditioner
{
    public int Temperature{ get; set; }
    public string Mode { get; set; }
}

JSON file format:

{
  "Light": {
    "Brightness": 5,
    "Mode": "On"
  },
  "AirConditioner": {
    "Temperature": 25,
    "Mode": "Cooling"
  }
}

I want to parse JSON file to C# by section, something like this:

var light = JsonDeserialize<Light>.(FileSection["Light"]);
var aircon = JsonDeserialize<AirConditioner>.(FileSection["AirConditioner"]);

What I want is the same as Asp.Net Core configuration work:

var light = new Light();
Configuration.GetSection("Light").Bind(light);

It will be better if I do not need to install other packages.

Thank you for your help.

Update: The problem is how to get a section of the JSON file. If I can get the Light section like this:

var lightString = JsonFile.GetSection("Light");

Then I can simply deserialize with System.Text.Json namespace:

var light = JsonSerializer.Deserialize<Light>(lightString);

Answer 1

I have done this by creating a parent class that holds the Light and AirConditioner properties.

The parent Class:

public class Devices
{
    public Light Light {get;set;}
    public AirConditioner AirConditioner {get;set;}
}

Then you can de-serialize into the Devices and access the light and airconditioner.

var devices = JsonDeserialize<Devices>.(myjsonfilecontent);
var light = devices.Light;
var aircon = devices.AirConditioner;

Answer 2

I think you're looking for https://www.newtonsoft.com/json/help/html/SerializingJSONFragments.htm in Newtonsoft's JSON.Net

It allows for manipulating of a whole JSON object as very generic JOBject and locating and converting only the parts you need.

In your example this looks something like the following. This code uses the newtonsoft.json package.

using System;
using Newtonsoft.Json.Linq;

namespace SO_67293726
{

    public class Light
    {
        public int Brightness { get; set; }
        public string Mode { get; set; }
    }

    public class AirConditioner
    {
        public int Temperature { get; set; }
        public string Mode { get; set; }
    }

    class Program
    {
        public static string JsonString =>
@"{
  ""Light"": {
    ""Brightness"": 5,
    ""Mode"": ""On""
  },
  ""AirConditioner"": {
    ""Temperature"": 25,
    ""Mode"": ""Cooling""
  }
}";
        static void Main(string[] args)
        {
            var jobject = JObject.Parse(JsonString);
            var light = jobject["Light"].ToObject<Light>();
            var aircon = jobject["AirConditioner"].ToObject<AirConditioner>();
        }
    }
}