using System.Text.Json;

using System.Text.Json.Serialization;

using System;

​

namespace Fields

{

    public class Forecast

    {

        public DateTime Date;

        public int TemperatureC;

        public string? Summary;

    }

​

    public class Forecast2

    {

        [JsonInclude]

        public DateTime Date;

        [JsonInclude]

        public int TemperatureC;

        [JsonInclude]

        public string? Summary;

    }

​

    public class Program

    {

        public static void Main()

        {

            var json =

                @"{""Date"":""2020-09-06T11:31:01.923395"",""TemperatureC"":-1,""Summary"":""Cold""} ";

            Console.WriteLine($"Input JSON: {json}");

​

            var options = new JsonSerializerOptions

            {

                IncludeFields = true,

            };

            var forecast = JsonSerializer.Deserialize<Forecast>(json, options)!;

​

            Console.WriteLine($"forecast.Date: {forecast.Date}");

            Console.WriteLine($"forecast.TemperatureC: {forecast.TemperatureC}");

            Console.WriteLine($"forecast.Summary: {forecast.Summary}");

​

            var roundTrippedJson =

                JsonSerializer.Serialize<Forecast>(forecast, options);

​

            Console.WriteLine($"Output JSON: {roundTrippedJson}");

​

            var forecast2 = JsonSerializer.Deserialize<Forecast2>(json)!;

​

            Console.WriteLine($"forecast2.Date: {forecast2.Date}");

            Console.WriteLine($"forecast2.TemperatureC: {forecast2.TemperatureC}");

            Console.WriteLine($"forecast2.Summary: {forecast2.Summary}");

​

            roundTrippedJson = JsonSerializer.Serialize<Forecast2>(forecast2);

            Console.WriteLine($"Output JSON: {roundTrippedJson}");

        }

    }

}

​

// Produces output like the following example:

//

//Input JSON: { "Date":"2020-09-06T11:31:01.923395","TemperatureC":-1,"Summary":"Cold"}

//forecast.Date: 9/6/2020 11:31:01 AM

//forecast.TemperatureC: -1

//forecast.Summary: Cold

//Output JSON: { "Date":"2020-09-06T11:31:01.923395","TemperatureC":-1,"Summary":"Cold"}

//forecast2.Date: 9/6/2020 11:31:01 AM

//forecast2.TemperatureC: -1

//forecast2.Summary: Cold

//Output JSON: { "Date":"2020-09-06T11:31:01.923395","TemperatureC":-1,"Summary":"Cold"}