// @nuget: Newtonsoft.Json

using System;

using System.Collections.Generic;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

​

public class Program

{

    public static void Main()

    {

        var testObj = new

        {

            One = "hello",

            Two = DateTimeOffset.UtcNow,

            Array = new[]

            {

                1,

                2,

                3,

                4,

                5,

                6,

                0,

                0,

                0

            },

            OneNull = (string)null,

            TwoNullable = (DateTimeOffset?)DateTimeOffset.UtcNow,

            Dict = new Dictionary<string, object>

            {

                { "thisa", new { Now = 0 }},

                { "thisb", new { Now = 0 }},

                { "thisc", new { Now = 5 }},

                { "thisd", new { Now = 23 }},

                { "thise", new { Now = 1 }},

                { "thisf", null},

            },

            Obj = new {

                Now = (object)null,

                Three = (int?)null,

                Four = "one",

                Five = ""

            }

        };

        Console.WriteLine("Result: " + CountNonDefaultPropertiesEntry(testObj));

    }

​

    public static int CountNonDefaultPropertiesEntry(object obj)

    {

        // Let JsonConvert do the work of stripping out default values

        var serialized = JsonConvert.SerializeObject(obj, new JsonSerializerSettings{DefaultValueHandling = DefaultValueHandling.Ignore});

        // Recurse into the json structure, which is much simpler than C# Object structure

        var jObj = JObject.Parse(serialized);

        return CountNonDefaultPropertiesJToken(jObj);

    }

​

    static int CountNonDefaultPropertiesJToken(JToken token)

    {

        var sum = 0;

        if (token.Type == JTokenType.Object)

        {

            foreach (var child in token.Value<JObject>())

            {

                sum += CountNonDefaultPropertiesJToken(child.Value);

            }

        }

        else if (token.Type == JTokenType.Array)

        {

            foreach (var child in token.Value<JArray>())

            {

                sum += CountNonDefaultPropertiesJToken(child);

            }

        }

        else

        {

            token.ToString().Dump();

            sum += 1;

        }

​

        return sum;

    }

}