Net Core - Receive POST Enum Array to a controller

Question

I am learning .NET Core but I cannot figure how to do this.

Having this controller:

[Route("api/[controller]")]
[ApiController]
public class ModelController : Controller
{
        private readonly ModelService _modelService;

        public ModelController(ModelService ModelService)
        {
            _modelService= ModelService;
        }
        [HttpGet]
        public ActionResult<ListModel>> Get() =>
            _modelService.Get();

        [HttpPost]
        public ActionResult<Model> Create(Model newModel)
        {
            _modelService.Create(newModel);

            return CreatedAtRoute("GetModel", new { id = model.Id.ToString() }, model);
        }
}

This enum:

public enum ModelEnum
{
    Property = 0,
    OtherProperty = 1
}

And this model:

public class Model
{
    [BsonId]
    [BsonRepresentation(BsonType.ObjectId)]
    public string Id { get; set; }
    [BsonElement("Name")]
    public string Name{ get; set; }
    public ModelEnum[] theEnum { get; set; }
}

How can can I send a request with the property theEnum? I am using postman to test it. When I try to do I receive this a HTTP 400 response with always with errors

First test: { "Name": "Test", "theEnum": [1, 2] }

First error response

{ "type": "https://www.rfc-editor.org/rfc/rfc7231#section-6.5.1", "title": "One or more validation errors occurred.", "status": 400, "traceId": "|100e6798-429066a034f499f7.", "errors": { "$.Clases": [ "The JSON value could not be converted to System.String. Path: $.Clases | LineNumber: 2 | BytePositionInLine: 21." ] } }

Second try:

{
    "Name": "Test",
    "theEnum": ["Property", "OtherProperty"]
}

Second error response:

{ "type": "https://www.rfc-editor.org/rfc/rfc7231#section-6.5.1", "title": "One or more validation errors occurred.", "status": 400, "traceId": "|100e6799-429066a034f499f7.", "errors": { "$.Escuelas[0]": [ "The JSON value could not be converted to Project.ModelEnum[]. Path: $.Escuelas[0] | LineNumber: 3 | BytePositionInLine: 29." ] } }

So I am wondering, how can I send the value of a Enum type array? Am I doing totally wrong? Maybe the validation messages said what I need but I cannot understand.

you need to have [JsonConverter(typeof(StringEnumConverter))] public enum ModelEnum — Vivek Nuna
– Vivek Nuna, Commented Jun 11, 2020 at 12:41
I guess that StringEnumConverter is a class that I have to write, is this correct? — Javier Torron Diaz
– Javier Torron Diaz, Commented Jun 11, 2020 at 12:45
But I dont think it will work in .net core project. It works with .net framework — Vivek Nuna
– Vivek Nuna, Commented Jun 11, 2020 at 12:49

Evgene Sofronov · Accepted Answer · 2020-06-11 12:48:18Z

1

You test value for enum 1 and 2. but don't provide enum for value 2
You provide

public enum ModelEnum
{
    Property = 0,
    OtherProperty = 1
}

Property with value 0 and OtherProperty with value 1. but test value 1 and 2. Add MyProperty = 2 in ModelEnum or test 0,1 value
for secon try you need use StringEnumConverter

edited Jun 11, 2020 at 12:48

answered Jun 11, 2020 at 12:33

Evgene Sofronov

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2 Comments

Javier Torron Diaz Over a year ago

Sorry, cant understand you. Can you explain your answer?

Javier Torron Diaz Over a year ago

Thanks for the edit. Now I understand you. I will try it.

vlod11 · Accepted Answer · 2020-06-11 12:51:32Z

0

I guess the problem is about serializing enum array to JSON. In Core 3.0+ there is a new serializer that does not yet fully support serialization of enums. What you need to do is to add Newtonsoft.Json to your project. And then call AddNewtonsoftJson() in Startup.ConfigureServices.

Note that enum array converts to digits during serialization

answered Jun 11, 2020 at 12:51

vlod11

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1 Comment

Javier Torron Diaz Over a year ago

Thanks for it, I will give it a try

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