Convert JSON response to Custom C# object

Question

I am making a call to a webservice and getting following Json Respons

{"handler":{"name":"abc"},"intent":{"name":"actions.intent.MAIN","params":{},"query":"Mit Google sprechen"},"scene":{"name":"actions.scene.START_CONVERSATION","slotFillingStatus":"UNSPECIFIED","slots":{},"next":{"name":"Start_Frage"}},"session":{"id":"ABwppHHVumDrliLJaLSikS6KnIlN7yYv6Z4XJCOYzEZt8Fr08RH6r0wtM2-E0v40lS2p1YosTDfpSCd5Lw","params":{},"typeOverrides":[],"languageCode":""},"user":{"locale":"de-DE","params":{},"accountLinkingStatus":"ACCOUNT_LINKING_STATUS_UNSPECIFIED","verificationStatus":"VERIFIED","packageEntitlements":[],"gaiamint":"","permissions":[],"lastSeenTime":"2021-04-01T10:06:59Z"},"home":{"params":{}},"device":{"capabilities":["SPEECH","RICH_RESPONSE","LONG_FORM_AUDIO"]}}

I used https://json2csharp.com/ to convert my Json String to C# Classes

 public class Handler
    {
        public string name { get; set; }
    }

    public class Params
    {
    }

    public class Intent
    {
        public string name { get; set; }
        public Params @params { get; set; }
        public string query { get; set; }
    }

    public class Slots
    {
    }

    public class Next
    {
        public string name { get; set; }
    }

    public class Scene
    {
        public string name { get; set; }
        public string slotFillingStatus { get; set; }
        public Slots slots { get; set; }
        public Next next { get; set; }
    }

    public class Session
    {
        public string id { get; set; }
        public Params @params { get; set; }
        public List<object> typeOverrides { get; set; }
        public string languageCode { get; set; }
    }

    public class User
    {
        public string locale { get; set; }
        public Params @params { get; set; }
        public string accountLinkingStatus { get; set; }
        public string verificationStatus { get; set; }
        public List<object> packageEntitlements { get; set; }
        public string gaiamint { get; set; }
        public List<object> permissions { get; set; }
        public DateTime lastSeenTime { get; set; }
    }

    public class Home
    {
        public Params @params { get; set; }
    }

    public class Device
    {
        public List<string> capabilities { get; set; }
    }

    public class Root
    {
        public Handler handler { get; set; }
        public Intent intent { get; set; }
        public Scene scene { get; set; }
        public Session session { get; set; }
        public User user { get; set; }
        public Home home { get; set; }
        public Device device { get; set; }
    }

But how exactly do I parse my Json respone into an C# Object? Then make any changes to It and finally send a response back? Im a newbie in programming thats why a Step by Step example would be very helpful

My current class looks like this. Variable body holds the Json response.

public class GoogleController : ControllerBase
    {

        [HttpGet]
        public IActionResult Get()
        {
            var result = new Result();
            result.Value1 = 123;

            return Ok(result);
        }
        [HttpPost]
        public async Task<IActionResult> PostWebHook()
        {

            string body;
            using (var reader = new StreamReader(Request.Body))
            {
                body = await reader.ReadToEndAsync();

            }
            return Ok("Test123");
                
        }
    }

Answer 1

Use FromBody attribute to deserialize body

    [HttpPost]
    public async Task<IActionResult> PostWebHook([FromBody] Root root)
    {
        // root is deserialized body
        // modify root
        ...
        return Ok(root);
    }