DictionaryDynamicObject.cs

using System;
using System.Collections.Generic;

namespace ServiceStack.Mvc
{
    public class DictionaryDynamicObject : System.Dynamic.DynamicObject
    {
        Dictionary<string, object> Object { get; }
        public DictionaryDynamicObject(Dictionary<string, object> obj) => Object = obj;

        public override bool TryGetMember(System.Dynamic.GetMemberBinder binder, out object result)
        {
            if (!Object.TryGetValue(binder.Name, out var ret))
                throw new InvalidOperationException(binder.Name);

            var modelType = ret?.GetType();
            if (modelType != null && (!modelType.IsPublic
                                      && modelType.BaseType == typeof(object)
                                      && modelType.DeclaringType == null))
            {
                result = new DictionaryDynamicObject(ret.ToObjectDictionary());
            }
            else
            {
                result = ret;
            }

            return true;
        }
    }
}