using System;

using System.Collections.Generic;

​

using System.Text.Json;

using static System.Console;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("------Deserialize  ReadOnlySpan<char>-----");

        Demo.Test1();

    }

}

​

    public class WeatherForecast

    {

        public DateTimeOffset Date { get; set; }

        public int TemperatureCelsius { get; set; }

        public string? Summary { get; set; }

        public string? SummaryField;

        public IList<DateTimeOffset>? DatesAvailable { get; set; }

        public Dictionary<string, HighLowTemps>? TemperatureRanges { get; set; }

        public string[]? SummaryWords { get; set; }

    }

​

    public class HighLowTemps

    {

        public int High { get; set; }

        public int Low { get; set; }

    }

​

    public class Demo

    {

        public static void Test1()

        {

            //implicit string conversion to  ReadOnlySpan<char>

            ReadOnlySpan<char> json =

@"{

  ""Date"": ""2019-08-01T00:00:00-07:00"",

  ""TemperatureCelsius"": 25,

  ""Summary"": ""Hot"",

  ""DatesAvailable"": [

    ""2019-08-01T00:00:00-07:00"",

    ""2019-08-02T00:00:00-07:00""

  ],

  ""TemperatureRanges"": {

                ""Cold"": {

                    ""High"": 20,

      ""Low"": -10

                },

    ""Hot"": {

                    ""High"": 60,

      ""Low"": 20

    }

            },

  ""SummaryWords"": [

    ""Cool"",

    ""Windy"",

    ""Humid""

  ]

}

";          

​

            var weatherForecast =  JsonSerializer.Deserialize<WeatherForecast>(json);

            if (weatherForecast is null) return;

            WriteLine($"Date: {weatherForecast.Date}");

            WriteLine($"TemperatureCelsius: {weatherForecast.TemperatureCelsius}");

            WriteLine($"Summary: {weatherForecast.Summary}");

        }

    }

​

// output:

//Date: 8/1/2019 12:00:00 AM -07:00

//TemperatureCelsius: 25

//Summary: Hot