using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

using System.Reflection;

​

using System.Text.Json;

using System.Text.Json.Serialization;

​

using NUnit.Framework; // Throws NUnit.Framework.AssertionException

​

//https://stackoverflow.com/questions/64201481/what-is-the-difference-if-any-between-the-jsonrequired-and-jsonpropertyreq

​

    public class Thing {

        public int Id { get; set; }

        public string Name { get; set; }

        [JsonConverter(typeof(UnsafeRawJsonConverter))]

        public string Data { get; set; } // JSON Data

    }

​

    /// <summary>

    /// Serializes the contents of a string value as raw JSON.  The string is validated as being an RFC 8259-compliant JSON payload

    /// </summary>

    public class RawJsonConverter : JsonConverter<string>

    {

        public override string Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)

        {

            using var doc = JsonDocument.ParseValue(ref reader);

            return doc.RootElement.GetRawText();

        }

​

        protected virtual bool SkipInputValidation => false;

​

        public override void Write(Utf8JsonWriter writer, string value, JsonSerializerOptions options) =>

            // skipInputValidation : true will improve performance, but only do this if you are certain the value represents well-formed JSON!

            writer.WriteRawValue(value, skipInputValidation : SkipInputValidation);

    }

    /// <summary>

    /// Serializes the contents of a string value as raw JSON.  The string is NOT validated as being an RFC 8259-compliant JSON payload

    /// </summary>

    public class UnsafeRawJsonConverter : RawJsonConverter

    {

        protected override bool SkipInputValidation => true;

    }

​

    class TestClass

    {

        public static void Test()

        {

            Test("{\"key\":\"value\"}");

            Test(@"[

[[""aa"",2,[],{}]]]");

            Test("true");

            Test(null);

            Assert.Throws<JsonException>(()=> Test("Foo"));

        }

        public static void Test(string data)

        {

            var thing = new Thing

            {

                Id = 1,

                Name = "Thing",

                Data = data,

            };

            var json = JsonSerializer.Serialize(thing, new JsonSerializerOptions { WriteIndented = true });

            Console.WriteLine(json);

            var thing2 = JsonSerializer.Deserialize<Thing>(json);

            Console.WriteLine(thing2.Data);

            Assert.AreEqual(data, thing2.Data);

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1})", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription, Environment.Version);

            Console.WriteLine("System.Text.Json version: " + typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​