using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        JObject o1 = JObject.Parse(@"{

  'FirstName': 'John',

  'LastName': 'Smith',

  'Enabled': false,

  'Roles': [ 'User' ],

  'NewPro': {

    'Pro1': 'val2',

    'Pro3': 'val3'

  },

}");

JObject o2 = JObject.Parse(@"{

  'NewPro': {

    'Pro1': 'val1',

    'Pro2': 'val2'

  },

  'Enabled': true,

  'Roles': [ 'User', 'Admin' ]

}");

​

o1.Merge(o2, new JsonMergeSettings

{

    // union array values together to avoid duplicates

    MergeArrayHandling = MergeArrayHandling.Union

});

​

string json = o1.ToString();

        Console.WriteLine(json);

    }

}

​

[JsonConverter(typeof(PersonConverter))]

public class Person 

{

    public int Id { get; set; }

    public string FirstName { get; set; }

    public string LastName { get; set; }

    public string Address1 { get; set; }

    public string Address2 { get; set; }

}

​

class PersonConverter : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return objectType == typeof(Person);

    }

​

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

    {

        Person person = (Person)value;

        JObject result = new JObject();

        result.Add("id", person.Id);

        result.Add("fullname", (person.FirstName + " " + person.LastName).Trim());

        result.Add("address", (person.Address1 + " " + person.Address2).Trim());

        result.WriteTo(writer);

    }

​

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

    {

        JObject obj = JObject.Load(reader);

        Person person = new Person();

        person.Id = (int)obj["id"];   // assuming id will always be present in the JSON

        string fullName = (string)obj["fullname"];

        if (fullName != null)

        {

            string[] parts = fullName.Split(new char[] { ' ' }, 2);

            // if there's only 1 part, I'm assuming it is the first name

            if (parts.Length > 0)

                person.FirstName = parts[0];

            if (parts.Length > 1)

                person.LastName = parts[1];

        }

        person.Address1 = (string)obj["address"];  // don't bother trying to split address

        return person;

    }

}