using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

using System.Reflection;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

using Newtonsoft.Json.Schema; //https://www.newtonsoft.com/jsonschema/help/html/Introduction.htm

​

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

​

//https://stackoverflow.com/questions/66051556/how-do-i-output-jschema-without-the-formatting

​

    public static partial class JsonExtensions

    {

        public static string ToString(this JSchema schema, Formatting formatting, JSchemaWriterSettings settings = default)

        {

            using var sw = new StringWriter(CultureInfo.InvariantCulture);

            using (var jsonWriter = new JsonTextWriter(sw) { Formatting = formatting })

                if (settings == null)

                    schema.WriteTo(jsonWriter);

                else

                    schema.WriteTo(jsonWriter, settings); // This overload throws if settings is null

            return sw.ToString();

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            string schemaJson = @"{

              'description': 'A person',

              'type': 'object',

              'properties':

              {

                'name': {'type':['string','null']},

                'hobbies': {

                  'type': 'array',

                  'items': {'type':'string'}

                }

              }

            }";

​

            var schema = JSchema.Parse(schemaJson);

            var json1 = JsonConvert.SerializeObject(schema, Formatting.None);

            Console.WriteLine(json1);

​

            var unversionedSchema = schema.ToString(Formatting.None);

            Assert.AreEqual(json1, unversionedSchema);

            Assert.IsTrue(JToken.DeepEquals(JToken.Parse(json1), JToken.Parse(schemaJson)));

            Assert.IsTrue(!json1.Contains("\n"));

            var versionedSchema = schema.ToString(Formatting.None, new JSchemaWriterSettings { Version = SchemaVersion.Draft7 } );

            Console.WriteLine(versionedSchema);

        }   

    }

​

    public class Program

    {

        public static void Main()

        {

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

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

            Console.WriteLine("Json.NET Schema version: " + typeof(Newtonsoft.Json.Schema.JSchema).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

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

                Console.WriteLine(ex);

                throw;

            }

        }

        public static string GetNetCoreVersion()

        {

            //https://techblog.dorogin.com/how-to-detect-net-core-version-in-runtime-ecd65ad695be

            //

            var assembly = typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly;

            var assemblyPath = assembly.Location.Split(new[] { '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);

            int netCoreAppIndex = Array.IndexOf(assemblyPath, "Microsoft.NETCore.App");

            if (netCoreAppIndex > 0 && netCoreAppIndex < assemblyPath.Length - 2)

                return assemblyPath[netCoreAppIndex + 1];

            return string.Empty;

        }

    }

​