Post by Postman is giving error of Object Reference not set to an instance of an Object

Question

I understand that the Frombody is coming null and I don’t know why.

That’s my Postman payload

{
    "ChannelCode" : "TS",
    "Name" : "Teste",
    "Celphone" : "(11)999999999",
    "Endpoint" : "www.teste.com.br",
    "TokenLogin" : "1234567890",
    "TokenLoginExpiration" : "2018-06-13T00:00:00.000Z",
    "Active" : "true"
}

In this controller I get the request

[HttpPost]
[Authorize("Bearer")]
public async Task<IActionResult> Create([FromBody]ChannelCreateRequest channel)
{
     if (channel == null) throw new WhatsAppApiException("Favor informar os dados do Canal!");
     var result = await _channelCreateService.Process(new ChannelCreateCommand(channel.ChannelCode, channel.Name, 
                             channel.Celphone, channel.Endpoint, 
                             channel.TokenLogin,                                          
                             channel.TokenLoginExpiration ,                                                              
                             channel.Active.GetValueOrDefault(true)));

        return Ok(new ApiReturnItem<ChannelResult> { Item = result, Success = true });
    }

everything will be recorded on Mongodb

Channelcreaterequest class

public class ChannelCreateRequest
    {
        [JsonProperty("codigo_canal")]
        public string ChannelCode { get; set; }
        [JsonProperty("nome")]
        public string Name { get; set; }
        [JsonProperty("celular")]
        public string Celphone { get; set; }
        [JsonProperty("url")]
        public string Endpoint { get; set; }      

        //------ Remover-----------

        [JsonProperty("token_canal")]
        public string TokenLogin { get; set; }
        [JsonProperty("token_canal_expiracao")]
        public DateTime? TokenLoginExpiration { get; set; }

       //--------Fim remover---------

        [JsonProperty("ativo")]
        public Boolean? Active { get; set; }
    }

responding to Pagotti, this is Postman

Answer 1

Remove the "Jsonproperty" annotations looks like Webapi uses Newtonsoft as the default to deserialize the class and this is causing it to get lost.

Another solution is to use xml this way:

{
    "codigo_canal" : "TS",
    "nome" : "Teste",
    "celular" : "(11)999999999",
    "url" : "www.teste.com.br",
    "token_canal" : "1234567890",
    "token_canal_expiracao" : "2018-06-13T00:00:00.000Z",
    "ativo" : "true"
}