using System;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json;

using Newtonsoft.Json.Serialization;

public class Program

{

    public static void Main()

    {

        Widget w = new Widget(2) { Name = "Thingamajig" };

​

        JsonSerializerSettings settings = new JsonSerializerSettings

        {

            ContractResolver = new WritablePropertiesOnlyResolver()  // comment out this line to see all properties

        };

​

        string json = JsonConvert.SerializeObject(w, settings);

​

        Console.WriteLine(json);    // We are expecting only the Name in the output since it is the only writable property in Widget

    }

}

​

class Widget

{

    public int Id { get; }  // read-only, initialized in constructor

    public string Type { get; } = nameof(Widget);  // read-only with initializer

    public string Name { get; set; }  // read-write

    public string LowerCaseName  // read-only with function body

    {

        get { return (Name != null ? Name.ToLower() : null); }

    }

    public string BackwardName => Name != null ? new string(Name.ToCharArray().Reverse().ToArray()) : null;   // read-only with lamba body

    public Widget(int id) {

        Id = id;

    }

}

​

class WritablePropertiesOnlyResolver : DefaultContractResolver

{

    protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)

    {

        IList<JsonProperty> props = base.CreateProperties(type, memberSerialization);

        return props.Where(p => p.Writable).ToList();

    }

}