c# - web-api POST body object always null

Question

I'm still learning web API, so pardon me if my question sounds stupid.

I have this in my StudentController:

public HttpResponseMessage PostStudent([FromBody]Models.Student student)
{
    if (DBManager.createStudent(student) != null)
        return Request.CreateResponse(HttpStatusCode.Created, student);
    else
        return Request.CreateResponse(HttpStatusCode.BadRequest, student);
}

In order to test if this is working, I'm using Google Chrome's extension "Postman" to construct the HTTP POST request to test it out.

This is my raw POST request:

POST /api/Student HTTP/1.1
Host: localhost:1118
Content-Type: application/json
Cache-Control: no-cache

{"student": [{"name":"John Doe", "age":18, "country":"United States of America"}]}

student is supposed to be an object, but when I debug the application, the API receives the student object but the content is always null.

Answer 1

FromBody is a strange attribute in that the input POST values need to be in a specific format for the parameter to be non-null, when it is not a primitive type. (student here)

1. Try your request with {"name":"John Doe", "age":18, "country":"United States of America"} as the json.
2. Remove the [FromBody] attribute and try the solution. It should work for non-primitive types. (student)
3. With the [FromBody] attribute, the other option is to send the values in =Value format, rather than key=value format. This would mean your key value of student should be an empty string...

There are also other options to write a custom model binder for the student class and attribute the parameter with your custom binder.