using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json;

using Newtonsoft.Json.Serialization;

public class Program

{

    public static void Main()

    {

        Foo foo = new Foo();

        foo.Dict = new Dictionary<string, string>();

        foo.Dict.Add("Gee", "Whiz");

        foo.Dict.Add("Fizz", "Bang");

        JsonSerializerSettings settings = new JsonSerializerSettings();

        settings.Formatting = Formatting.Indented;

        settings.ContractResolver = new DictionaryAsArrayResolver();

        // serialize

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

        Console.WriteLine(json);

        Console.WriteLine();

​

        // deserialize

        foo = JsonConvert.DeserializeObject<Foo>(json, settings);

        foreach (var kvp in foo.Dict)

        {

            Console.WriteLine(kvp.Key + ": " + kvp.Value);

        }

    }

​

    class Foo

    {

        public Dictionary<string, string> Dict { get; set; }

    }

}

​

class DictionaryAsArrayResolver : DefaultContractResolver

{

    protected override JsonContract CreateContract(Type objectType)

    {

        if (objectType.GetInterfaces().Any(i => i == typeof(IDictionary) || 

            (i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IDictionary<,>))))

        {

            return base.CreateArrayContract(objectType);

        }

        return base.CreateContract(objectType);

    }

}

​