using System;

using System.Reflection;

using Newtonsoft.Json;

using Newtonsoft.Json.Serialization;

public class Program

{

    public static void Main()

    {

        Example ex = new Example

        {

            WritableProperty = "Quux"

        };

        JsonSerializerSettings settings = new JsonSerializerSettings

        {

            ContractResolver = CustomContractResolver.Instance,

            Formatting = Formatting.Indented

        };

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

        Console.WriteLine(json);

    }

}

​

public class CustomContractResolver : DefaultContractResolver

{

    public static readonly CustomContractResolver Instance = new CustomContractResolver();

    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)

    {

        JsonProperty property = base.CreateProperty(member, memberSerialization);

        // Ignore get-only properties that do not have a [JsonProperty] attribute

        if (!property.Writable && member.GetCustomAttribute<JsonPropertyAttribute>() == null)

            property.Ignored = true;

        return property;

    }

}

​

public class Example

{

    [JsonProperty]

    public string ThisPropertyHasToBeSerialized

    {

        get { return "Foo"; }

    }

    public string ThisPropertyHasToBeSkipped

    {

        get { return "Bar"; }

    }

    public string WritableProperty { get; set; }

}

​

​