我想在接收来自API的值时将字符串转换为JSON。我正在从postman发送值，但无法将其转换为模型类中的JSON对象，我已使用自定义装饰器装饰了模型类。提前感谢。
这是模型类，我编写了自定义JSON转换器。

namespace WebApplication2.Models
   {
    [Serializable]
    public class Test
    {
        [JsonConverter(typeof(UserConverter))]
        public AS_AscContext AscParcelContext { get; set; }

    }
    public class AS_AscContext
    {
        public string ShellType { get; set; }
        public string LayoutName { get; set; }
    }

   
    public class UserConverter : JsonConverter
    {
        private readonly Type[] _types;

        public UserConverter(params Type[] types)
        {
            _types = types;
        }

        public override void WriteJson(JsonWriter writer, object value, Newtonsoft.Json.JsonSerializer serializer)
        {
            JToken t = JToken.FromObject(value);

            if (t.Type != JTokenType.Object)
            {
                t.WriteTo(writer);
            }
            else
            {
                JObject o = (JObject)t;
                IList<string> propertyNames = o.Properties().Select(p => p.Name).ToList();

                o.AddFirst(new JProperty("Keys", new JArray(propertyNames)));

                o.WriteTo(writer);
            }
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, Newtonsoft.Json.JsonSerializer serializer)
        {
            throw new NotImplementedException("Unnecessary because CanRead is false. The type will skip the converter.");
        }

        public override bool CanRead
        {
            get { return false; }
        }

        public override bool CanConvert(Type objectType)
        {
            return _types.Any(t => t == objectType);
        }
    }

这是控制器接收值

[HttpPost]
    public IActionResult Privacy([FromBody]Test aS_AggregatorRequest)
    {
       
        return View();
    }

This is the postman collection