JsonTest.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace JSONTestingAgain
{
    class Program
    {
        static void Main(string[] args)
        {
            var test = new TestClass { TestGuid = Guid.NewGuid(), TestString = "blah" };
            test.TestDictionary.Add(Guid.NewGuid(), "testStringValue");
            test.TestDictionary.Add(Guid.NewGuid(), Guid.NewGuid());
            var nancyResult = Nancy(test);
            var microsoftResult = Microsoft(test);

            Console.WriteLine(nancyResult);
            Console.WriteLine(microsoftResult);
            Console.ReadLine();
        }

        private static TestClass Microsoft(TestClass test)
        {
            var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
            var result = serializer.Serialize(test);
            var newOne = serializer.Deserialize<TestClass>(result);
            return newOne;
        }

        private static TestClass Nancy(TestClass test)
        {
            var serializer = new Nancy.Json.JavaScriptSerializer();
            var result = serializer.Serialize(test);
            var newOne = serializer.Deserialize<TestClass>(result);
            return newOne;
        }
    }

    public class TestClass
    {
        public Guid TestGuid { get; set; }

        public String TestString { get; set; }

        public Dictionary<Guid, object> TestDictionary { get; set; }

        public TestClass()
        {
            this.TestDictionary = new Dictionary<Guid, object>();
        }

        public override string ToString()
        {
            return String.Format(
                "{0} {1} {2}",
                TestGuid,
                TestString,
                this.TestDictionary.Select(kv => kv.Key.ToString() + ":" + kv.Value.ToString()).Aggregate(
                    (kv1, kv2) => kv1 + "," + kv2));
        }
    }
}