POST is not receiving JSON

Question

I need some help with running a POST. 'Cause when I try to call my API (http://www.afectus.com.br/api/teste) for the execution of a Post, I am unable to pass the JSON to her.

Follows the API used:

// POST: api/Teste
public void Post([FromBody]string json)
{
    ClassRetorno cr = new ClassRetorno();

    if (string.IsNullOrEmpty(json))
    {
        cr = JsonConvert.DeserializeObject<ClassRetorno>("{\"Id\":1,\"Nome\":\"From Api\",\"Email\":\"[email protected]\"}");
    }
    else
    {
        cr = JsonConvert.DeserializeObject<ClassRetorno>(json);
    }

     mysql = new ClassMySQL();
     if (mysql.conectar())
     {
         mysql.insert("teste", "id, nome, email", cr.Id + ",'" + cr.Nome + "','" + cr.Email + "'");
     }
}

Summarizing: If the Json string is null or empty, it will be saved in the database (Id: 1, Name: From Api, Email: [email protected])

If not, it will be saved as per the received parameter.

This is the method that executes the Post:

public async Task Posting(ClassRetorno item)
{
    using (var client = new HttpClient())
    {
        var uri = new Uri("http://www.afectus.com.br/api/teste");
        var json = JsonConvert.SerializeObject(item);
        var content = new StringContent(json, Encoding.UTF8, "text/json");
        HttpResponseMessage response = new HttpResponseMessage();
        response = await client.PostAsync(uri, content);
        if (response.IsSuccessStatusCode)
        {
            await DisplayAlert("Alert", "Post executado!", "Ok");
        }
        else
        {
            await DisplayAlert("Alert", "Post não executado!", "Ok");
        }
    }
}

If anyone knows the possible cause of this problem, or at least can give some guidance, I would be grateful.

Obs: I used the Postman tool to test the API and it still didn’t work.

Answer 1

Receive the object ClassRetorno as a parameter instead of [FromBody]string json, the ModelBindingwill solve the json that is coming.