WebApi - Sent Guid taken as a new Guid

Question

I have an

ApiController

class with a method accepting a complex object.

public class SampleController : ApiController

{

    [Route("api/Sample/")]

    [HttpPost]

    public HttpResponseMessage GetSampleInfo([FromBody]SampleClass sampleClassObject)

    {

        // Some code

    }

}

When debugging, this

Controller

class method is called, but what was passed as a

Guid

in the object, shows a new

Guid

(as

00000000-0000-0000-0000-000000000000

). I'm first checking this method with Postman. I tried passing the object using

x-www-form-urlencoded

and also as

application/json

.

What I'm passing in Postman:

{

   "sampleID": "A9A999AA-AA99-9AA9-A999-9999999999AA",

   "otherValue": 1

}

I checked other issues like mine but I have tried the solutions but still I'm getting the passed

Guid

as a new

Guid

.

P.S.
The

SampleClass

looks like as follows:

public class SampleClass

{

    public Guid sampleID { get; set; }

    public int otherValue { get; set; }

}

Update:

I have used the following

JsonConverter

.

public class GuidConverterCustom : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return typeof(Guid) == objectType;

    }



    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

    {

        switch (reader.TokenType)

        {

            case JsonToken.Null:

                return Guid.Empty;

            case JsonToken.String:

                string str = reader.Value as string;

                if (string.IsNullOrEmpty(str))

                {

                    return Guid.Empty;

                }

                else

                {

                    return new Guid(str);

                }

            default:

                throw new ArgumentException("Invalid token type");

        }

    }



    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

    {

        if (Guid.Empty.Equals(value))

        {

            writer.WriteValue("");

        }

        else

        {

            writer.WriteValue((Guid)value);

        }

    }

}

And included the following in the

Global.asax.cs

:

JsonConvert.DefaultSettings = () =>

{

    var settings = new JsonSerializerSettings();

    settings.Converters.Add(new GuidConverterCustom());

    return settings;

};

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Answer 1

Your method should look like this, no need for custom JsonConverter.

[Route("sample")]
[HttpPost]
public IHttpActionResult PostGuid(SampleClass id)
{
    return Ok();
}

It then works with both x-www-form-urlencoded and application/json. If you use json do not forget the header Content-Type: application/json.

WebApi - Sent Guid taken as a new Guid

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