DynamicContractResolver

DynamicContractResolver.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;

namespace JsonPerf.Resolvers
{
    /// <summary>
    /// Can be used for any type to dynamically specify which properties are part of the serialization contract
    /// </summary>
    public class DynamicContractResolver : DefaultContractResolver
    {
        readonly List<string> _contractProperties;
        IList<JsonProperty> _jsonProperties;

        public DynamicContractResolver(params string[] contractProperties)
        {
            _contractProperties = contractProperties?.ToList();
        }

        protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
        {
            var properties = base.CreateProperties(type, memberSerialization);

            if (_contractProperties == null || !_contractProperties.Any())
                return properties;

            // only serialize our dynamic contract properties
            _jsonProperties =
                properties
                    .Join(
                         _contractProperties,
                         jsonProperty => jsonProperty.PropertyName,
                         typeProperty => typeProperty,
                         (jsonProperty, arg2) => jsonProperty)
                    .ToList();

            return _jsonProperties;
        }
    }
}