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Asked: 2020-11-21 03:40:26 +0800 CST 2020-11-21 03:40:26 +0800 CST

Web API 2 Action returns an empty json

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I have the following action that is returning an Ilist, when returning data it results in an Empty Json:

[
    {}
]

the apicontroller method is like this;

[HttpGet]
public IHttpActionResult ConsultaPuertos([FromUri] string id, 
[FromBody] List<PuertosGP> lstPuertosGP, [FromUri] DateTime fecha)
{

     var resultList1 = puertosGPRepository.ConsultaPuertos(id, lstPuertosGP, 
    fecha);
  return Ok(resultList1); 
 });

Is it feasible to send a Json(resultList1)? or make the action return not an IList but a JsonResult?

UPDATE In the step by step it is observed that at least one record returns from the portsGPRepository(...)enter image description here

in the POSTMAN the json is empty

UPDATE 2

I have changed in my WebApiConfig.cs

I have this line:

    public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Configuración y servicios de API web
        // Web API configuration and services
        config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));//text/html

enter image description here

c#

1 Answers

  1. Best Answer

    First of all the method has to be GET , since you are doing a query/request, POST methods are for publishing/saving information. That is, change [HttpPost]to [HttpGet], you also need to place the await in the query made in resultList1, since you defined the method as async , that is, you will have it.

    var resultList1 = await puertosGPRepository.ConsultaPuertos(id, lstPuertosGP, fecha).ToListAsynchronous();

    The IHttpActionResult methods are generally used in APIs since they allow you to return a return Contentwith more query specifications, I also recommend changing the method signature Task<IList<PuertosGP>>to Task<List<PuertosGP>>.

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