using System;

using System.Reflection;

using Newtonsoft.Json;

using Newtonsoft.Json.Serialization;

public class Program

{

    public static void Main()

    {

        Foo entity = new Foo

        {

            Id = Guid.NewGuid(),

            Name = "foo",

            Size = 10,

            Bar = new Bar

            {

                Id = Guid.NewGuid(),

                Name = "bar",

                Amount = 3.14m

            }

        };

        var json = JsonConvert.SerializeObject(entity, Formatting.None, new JsonSerializerSettings

        {

            ContractResolver = new IgnoreGuidsResolver(),

            ReferenceLoopHandling = ReferenceLoopHandling.Ignore

        });

        Console.WriteLine(json);

    }

}

​

​

class IgnoreGuidsResolver : DefaultContractResolver

{

    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)

    {

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

        if (prop.PropertyType == typeof(Guid))

        {

            prop.Ignored = true;

        }

        return prop;

    }

}

​

class Foo

{

    public Guid Id { get; set; }

    public string Name { get; set; }

    public int Size { get; set; }

    public Bar Bar { get; set; }

}

​

class Bar

{

    public Guid Id { get; set; }

    public string Name { get; set; }

    public decimal Amount { get; set; }

}

​