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 System.ComponentModel;

​

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 Newtonsoft.Json.Schema.Generation;

​

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

​

//https://stackoverflow.com/questions/68318180/adding-options-property-while-generating-json-schema-using-jschemagenerator

​

    [System.AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false)]

    public class HiddenAttribute : System.Attribute

    {

    }

​

    public class HiddenOptionProvider : CustomizedProviderBase

    {

        public override JSchema GetSchema(JSchemaTypeGenerationContext context)

        {

            var schema = base.GetSchema(context);

            // Get the JsonObjectContract for this type.

            var contract = (JsonObjectContract)context.Generator.ContractResolver.ResolveContract(context.ObjectType);

            foreach (var propertySchema in schema.Properties)

            {

                // Find the corresponding JsonProperty from the contract resolver.

                var jProperty = contract.Properties[propertySchema.Key];

                // Check to see if the member has HiddenAttribute set.

                if (jProperty.AttributeProvider.GetAttributes(typeof(HiddenAttribute), true).Any())

                    // If so add "options": { "hidden": true }

                    propertySchema.Value.ExtensionData["options"] = new JObject(new JProperty("hidden", true));

            }

            return schema;

        }

        public override bool CanGenerateSchema(JSchemaTypeGenerationContext context) =>

            base.CanGenerateSchema(context) && context.Generator.ContractResolver.ResolveContract(context.ObjectType) is JsonObjectContract;

    }

​

    public abstract class CustomizedProviderBase : JSchemaGenerationProvider

    {

        // Base class that allows generation of a default schema which may then be subsequently customized. 

        // Note this class contains state information and so is not thread safe.

        readonly Stack<Type> currentTypes = new ();

        public override JSchema GetSchema(JSchemaTypeGenerationContext context)

        {

            if (CanGenerateSchema(context))

            {

                var currentType = context.ObjectType;

                try

                {

                    currentTypes.Push(currentType);

                    return context.Generator.Generate(currentType);

                }

                finally

                {

                    currentTypes.Pop();

                }

            }

            else

                throw new NotImplementedException();

        }

        public override bool CanGenerateSchema(JSchemaTypeGenerationContext context) => 

            !currentTypes.TryPeek(out var t) || t != context.ObjectType;

    }

​

    [DisplayName("Person")]

    public class Person

    {

        [JsonProperty("name", Required = Required.DisallowNull)]

        [DefaultValue("Jeremy Dorn"), MinLength(4), System.ComponentModel.DescriptionAttribute("First and Last name")]

        [Hidden] // Your custom attribute

        public string Name { get; set; } = "Jeremy Dorn";

    }

​

    [DisplayName("SpecialPerson")]

    public class SpecialPerson

    {

        [JsonProperty("name", Required = Required.DisallowNull)]

        [DefaultValue("Jeremy Dorn"), MinLength(4), System.ComponentModel.DescriptionAttribute("First and Last name")]

        [Hidden] // Your custom attribute

        public string Name { get; set; } = "Jeremy Dorn";

​

        [JsonProperty(Required = Required.DisallowNull)]

        public string Title { get; set; }

        [JsonProperty(Required = Required.DisallowNull)]

        public List<SpecialPerson> MorePeople { get; set; } = new (); 

    }

​

    class TestClass

    {

        public static void Test()

        {

            Test<Person>(JSchema.Parse(GetQuestionSchema()));

            Test<decimal>(JSchema.Parse(@"{""type"":""number""}"));

            Test<SpecialPerson>();

            TestExample(new { SpecialPerson = default(SpecialPerson) });

        }

        public static void TestExample<Person>(Person example, JSchema requiredSchema = null)

        {

            Test<Person>(requiredSchema);

        }

        public static void Test<Person>(JSchema requiredSchema = null)

        {

            Console.WriteLine("\nGenerating schema for {0}:", typeof(Person));

​

            var generator = new JSchemaGenerator();

            generator.GenerationProviders.Add(new HiddenOptionProvider());

            var schema = generator.Generate(typeof(Person));            

            Console.WriteLine(schema);

            if (requiredSchema != null)

            {

                Assert.IsTrue(JToken.DeepEquals(JToken.FromObject(schema), JToken.FromObject(requiredSchema)));

            }

        }   

        static string GetQuestionSchema() => @"{

  ""title"": ""Person"",

  ""type"": ""object"",

  ""properties"": {

    ""name"": {

      ""type"": ""string"",

      ""options"": { ""hidden"": true },

      ""description"": ""First and Last name"",

      ""minLength"": 4,

      ""default"": ""Jeremy Dorn""

    }

  }

}"; }

​

    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 null;

        }

    }

​