Deserialize error using auto-generated C# source code by luis:generate:cs

[esalcedoo]

When the Convert tries to Deserialize Luis Result object, it crashes with this exception:

Newtonsoft.Json.JsonSerializationException: 'Error converting value "blanco" to type 'Microsoft.Bot.Builder.AI.Luis.DateTimeSpec'. Path 'entities.datetime[0]', line 20, position 14.'
Inner Exception
ArgumentException: Could not cast or convert from System.String to Microsoft.Bot.Builder.AI.Luis.DateTimeSpec.

The input comes with an entity, type datetime, that has no resolution:

"entities": [
  {
    "entity": "blanco",
    "type": "builtin.datetimeV2.date",
    "startIndex": 0,
    "endIndex": 5
  }
]

In Spanish we can say "la noche en blanco" referring to a holiday, thus LUIS detects it fine but it has no resolution day, https://github.com/microsoft/Recognizers-Text/blob/26d2020b19c12c3f30e22d4a11bfe1d4304fc1ed/JavaScript/packages/recognizers-date-time/src/resources/spanishDateTime.ts#L170

In my case, this issue can be solved if the JsonConvert.DeserializeObject method is called with an error event handler defined in the JsonSerializerSettings:

            var app = JsonConvert.DeserializeObject<GoioLuisModel>(
                JsonConvert.SerializeObject(result, 
                    new JsonSerializerSettings {
                        NullValueHandling = NullValueHandling.Ignore
                    }),
                new JsonSerializerSettings
                {
                    Error = HandleDeserializationError
                });

Would it has any sense to include an error handler in the generated source code by the converter?

[axelsrz]

Hello @esalcedoo thanks for the feedback.
This is a reasonable feature request over the current luis:generate, I will tag it so we can triage/discuss it on our next cycle.