How to "read" return messages ASP.NET CORE WEB API

Question

I see here numerous questions about how to create custom feedback in a WEB API using ASP.NET Core. My question, besides this is the client side, how this message can be read in the application that will consume the services. For example: the user is registering a new item in a database where the description cannot be repeated. How to return a message and how to read this message to present it to the user, if they try to inform an item that already exists?

I’m trying this way:

MODEL

namespace ComandinhaAPI.Models
{
   public class TipoCardapio
   {
       [Key]
       public int TipoId { get; set; }
       public string Descricao { get; set; }
   }
}

API ASP.NET - Controller

[HttpPost]
public IActionResult Create([FromBody] TipoCardapio tipoCardapio)
{
        if(tipoCardapio==null)
            return BadRequest("Necessário informar os dados do tipo!");

        string nomeUpper = tipoCardapio.Descricao.ToUpper();
        tipoCardapio.Descricao = nomeUpper;

        if(_tRepositorio.BuscaPorDescricao(tipoCardapio.Descricao) != null)

            return BadRequest("Já existe um tipo com essa descrição!");

        _tRepositorio.Add(tipoCardapio);

CLIENT - WINDOWS FORMS - HTTPCLIENT

using (var client = new HttpClient())
{
   var serializedTipo = JsonConvert.SerializeObject(tipoCardapio);
   var content = new StringContent(serializedTipo, Encoding.UTF8, 
   "application/json");
   var result = await client.PostAsync(apiUrl, content);

   if (!result.IsSuccessStatusCode)
   {
       MessageBox.Show("Falha ao salvar o Tipo do Cardápio : \n" +
                        result.StatusCode.ToString() + " : " + 
                        result.ReasonPhrase.ToString(), "Tipos do Cardápio", 
                        MessageBoxButtons.OK, MessageBoxIcon.Error);
   }
}
GetAllTipoCardapios();

I don’t know if this is the right way, but when I see the application running in debug mode I can read the messages returned in "result", but I can’t display them to the user.

There is another way to return and read API responses ?

Answer 1

In that case, I strongly recommend the library Restsharp that already makes the work of deserialization of the object for you, what you need to do is in your client have the similar object, in your case:

public class TipoCardapio
{
   [Key]
   public int TipoId { get; set; }
   public string Descricao { get; set; }
}

Where your call would be something with:

var client = new RestClient("URL");

var request = new RestRequest("Endpoint", Method.POST);
request.AddJsonBody(tipoCardatio); 

request.AddHeader("header", "value"); //Caso tenha algum Header

var response = client.Execute<TipoCardapio>(request);