using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

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/78146760/generate-json-schema-for-only-required-properties

​

    public class CategoryOnlyContractResolver : DefaultContractResolver

    {

        readonly bool alwaysIncludeConstructorParameters = false;

        readonly string category;

​

        public CategoryOnlyContractResolver(string category, bool alwaysIncludeConstructorParameters = false) : base() 

        {

            this.category = category;

            this.alwaysIncludeConstructorParameters = alwaysIncludeConstructorParameters; 

        }

​

        protected override JsonObjectContract CreateObjectContract(Type objectType)

        {

            var contract = base.CreateObjectContract(objectType);

            for (int i = contract.Properties.Count - 1; i >= 0; i--)

            {

                var p = contract.Properties[i];

                if (!p.AttributeProvider.GetAttributes(typeof(System.ComponentModel.CategoryAttribute), true).Cast<CategoryAttribute>().Any(c => c.Category == category)

                    || (alwaysIncludeConstructorParameters && contract.CreatorParameters.GetClosestMatchProperty(p.PropertyName) != null))

                    contract.Properties.RemoveAt(i);

            }

            return contract;

        }

    }

​

    class School

    {

        public School() { this.Id = 10; }

        [Editable(false)]

        [DisplayName("Student")]

        [Category("Student")]

        public string StudentName { get; set; }

​

        [Editable(true)]

        [Range(0, 1000, ErrorMessage = "Value for {0} must be between {1} and {2}.")]

        [Category("Student")]

        public int Id { get; set; }

​

        [Editable(false)]

        [DisplayName("ParentName")]

        [Category("Student")]

        public string ParentName { get; set; }

​

​

        [JsonProperty("ParentPhone", Required = Required.Default)]

        [PhoneMask("999-999-9999",

            ErrorMessage = "{0} value does not match the mask {1}.")]

        [Category("Student")]

        public string Phone;

​

        [Editable(true)]

        [Category("Staff")]

        public string TeacherName { get; set; }

​

        [Editable(true)]

        [Range(0, 10000, ErrorMessage = "Value for {0} must be between {1} and {2}.")]

        [DefaultValue(5000)]

        [Category("Staff")]

        public int Salary { get; set; }

        [ReadOnly(true)] [Category("Student")] public bool AvailingTransport { get; set; } = true;

    }

    //https://learn.microsoft.com/en-us/previous-versions/aspnet/cc668224(v=vs.100)?redirectedfrom=MSDN

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

    sealed public class PhoneMaskAttribute : ValidationAttribute

    {

        // Internal field to hold the mask value.

        readonly string _mask;

​

        public string Mask

        {

            get { return _mask; }

        }

​

        public PhoneMaskAttribute(string mask)

        {

            _mask = mask;

        }

​

​

        public override bool IsValid(object value)

        {

            var phoneNumber = (String)value;

            bool result = true;

            if (this.Mask != null)

            {

                result = MatchesMask(this.Mask, phoneNumber);

            }

            return result;

        }

​

        // Checks if the entered phone number matches the mask.

        internal bool MatchesMask(string mask, string phoneNumber)

        {

            if (mask.Length != phoneNumber.Trim().Length)

            {

                // Length mismatch.

                return false;

            }

            for (int i = 0; i < mask.Length; i++)

            {

                if (mask[i] == 'd' && char.IsDigit(phoneNumber[i]) == false)

                {

                    // Digit expected at this position.

                    return false;

                }

                if (mask[i] == '-' && phoneNumber[i] != '-')

                {

                    // Spacing character expected at this position.

                    return false;

                }

            }

            return true;

        }

​

        public override string FormatErrorMessage(string name)

        {

            return String.Format(CultureInfo.CurrentCulture,

              ErrorMessageString, name, this.Mask);

        }

​

    }   

​

    class TestClass

    {

        public static void Test()

        {

            var studentGenerator = new JSchemaGenerator();

            studentGenerator.ContractResolver = new CategoryOnlyContractResolver("Student");

            var studentSchema = studentGenerator.Generate(typeof(School));

            Console.WriteLine("Student Only schema for {0}:", typeof(School));

            Console.WriteLine(studentSchema);

            var defaultGenerator = new JSchemaGenerator();

            var defaultSchema  = defaultGenerator.Generate(typeof(School));

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

            Console.WriteLine(defaultSchema);

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1}), {2}", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , Environment.Version, Environment.OSVersion);

            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;

            }

        }

    }

​