delegation.cs

using System;
using Autofac;
using Newtonsoft.Json.Serialization;

/// Allows constructor dependencies to be resolved when deserializing JSON.NET instances.
public class DependencyContractResolver : DefaultContractResolver
{
    /// But what if I wanted to extend CamelCasePropertyNamesContractResolver instead of
    /// DefaultContractResolver in some cases? No way to switch it out without delegation.

    private readonly ILifetimeScope _scope;

    public DependencyContractResolver(ILifetimeScope scope)
    {
        _scope = scope;
    }

    protected override JsonObjectContract CreateObjectContract(Type objectType)
    {
        var contract = base.CreateObjectContract(objectType);

        if (_scope.IsRegistered(objectType))
            contract.DefaultCreator = () => _scope.Resolve(objectType);

        return contract;
    }
}