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.Xml.Serialization;

using System.Xml;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

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

​

//https://stackoverflow.com/questions/54135005/shouldserialize-with-xml-and-json

​

    public class UnitTest1

    {

        private readonly Customer _customer = new Customer

            {

                FirstName = "Paulo",

                LastName = "Balbino",

                Age = 25

            };

​

        [Serializable]

        public class Customer

        {

            [XmlElement("FirstName")]

            public string FirstName { get; set; }

​

            [XmlElement("LastName")]

            public string LastName { get; set; }

​

            [XmlElement("Age")]

            public int Age { get; set; }

​

            public bool ShouldSerializeLastName()

            {

                return Age > 30; // Enter here only if it is XmlSerialize.

            }

        }

​

        public void XmlSerialize()

        {

            var xmlSerializer = new XmlSerializer(typeof(Customer));

​

            using (var textWriter = new StringWriter())

            {

                xmlSerializer.Serialize(textWriter, _customer);

                var xml = textWriter.ToString();

                Console.WriteLine(xml);

                Assert.IsTrue(!xml.Contains(_customer.LastName));

            }

        }

​

        static DefaultContractResolver IgnoreShouldSerializeContractResolver = new DefaultContractResolver

        {

            IgnoreShouldSerializeMembers = true,

            //Set other properties as required:

            //NamingStrategy = new CamelCaseNamingStrategy(),

        };

        public void JsonConvert()

        {

            var settings = new JsonSerializerSettings

            {

                ContractResolver = IgnoreShouldSerializeContractResolver,

            };

            var json = Newtonsoft.Json.JsonConvert.SerializeObject(_customer, settings);

            Console.WriteLine(json);

            Assert.IsTrue(json.Contains(_customer.LastName));

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: " + Environment.Version);

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

            Console.WriteLine();

​

            try

            {

                new UnitTest1().XmlSerialize();

                new UnitTest1().JsonConvert();

            }

            catch (Exception ex)

            {

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

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​