Adv2015/D12.2/Program.cs

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Newtonsoft.Json.Serialization;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text.RegularExpressions;

namespace D12._2
{

    public class PropertyIgnoreSerializerContractResolver : DefaultContractResolver
    {
        protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
        {
            var property = base.CreateProperty(member, memberSerialization);

            if (property.PropertyName == "red")
            {
                property.ShouldSerialize = i => false;
                property.Ignored = true;
            }

            return property;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length < 1) throw new ArgumentException();
            if (File.Exists(args[0]) == false) throw new FileNotFoundException();

            var input = File.ReadAllText(args[0]);

            // Use dynamic to skip the use of specialized functions and a factory pattern
            dynamic n = JsonConvert.DeserializeObject(input);

            var result = SumValues(n);

            Console.WriteLine($"The answer is : {result}");
        }

        private static long SumValues(JValue n) => n.Type == JTokenType.Integer ? (long) n.Value : 0;

        private static long SumValues(JObject n)
        {
            if (n.Properties().Any(p => (p.Value as JValue)?.Value as string == "red"))
                return 0;

            return n.Properties().Sum((dynamic a) => (long)SumValues(a.Value));
        }

        private static long SumValues(JArray n) => n.Sum((dynamic a) => (long)SumValues(a));
    }
}