CODEWITHSUNDEEP
c#jsonrestasp.net-web-api2
krystan honour
krystan honour

Reputation: 6803

Object not deserialising correctly on put request with web api

I am using web-api 2 and postman rest client to test.

I have a method definition which looks like this:

[Route("api/bob/user")]
[HttpPut]
public IHttpActionResult UpdateUser(User user)

The user object looks like this:

public class User : IUser
{
    public string Firstname { get; set; }
    public string Lastname { get; set; }
}

public interface IUser
{
    string Firstname { get; set; }
    string Lastname { get; set; }
}

In postman i've set a put request and set the content type to JSON(application/json) I have specified the following in the body as raw:

{
   "user": {"Firstname":"Bob","Lastname":"Smith"}
}

When I send the request the object type is detected but none of the properties are populated (they are all null), leading me to believe the de-serialisation is failing.

If I change the method signature to object I get the json string and can deserialise it to a user object. I'd much prefer strong typing if possible.

my webapiconfig looks like this:

config.Formatters.JsonFormatter.SupportedMediaTypes.Add(
                                    new MediaTypeHeaderValue("text/html"));

config.MapHttpAttributeRoutes();

config.Routes.MapHttpRoute(
    name: "DefaultApi",
    routeTemplate: "api/{controller}/{id}/{action}",
    defaults: new {id = RouteParameter.Optional});

I also add a screenshot of the test client:

content type shown

Upvotes: 1

Views: 93

Answers (1)

janhartmann
janhartmann

Reputation: 15003

You should not put the user property before. Your JSON should look like:

{
   "Firstname": "Bob",
   "Lastname": "Smith"
}

In order for the model binder to bind to the model.

If you wish to go with your current JSON, your User model should look like

public class User {
   public User User { get; set; }  
}

Also make sure you use application/json as the content type.

Upvotes: 5

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