Why isn't my post JSON object getting serialized?

Question

Why isn't my POST JSON object getting serialized? I'm using Web API 2.0. My controller route looks like this:

[HttpPost]
[Route]
public async Task<IHttpActionResult> AddUserAsync([FromBody] User user)
{
    //do some stuff
}

My User object looks like this:

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

    string Name { get; set; }
}

When I pass the following JSON object the Id and Name props get serialized with null values:

{
    "Id": "895C4492-B751-462C-9738-C6CB4E94E21F",
    "Name": "Joe System"
}

Do I need to decorate User with [DataContract] or something like that?

How to manage this in Web API 2?

Answer 1

Your properties are not public. You need to make them public

public class User {
    public Guid Id { get; set; }    
    public string Name { get; set; }
}

The model binder inspects the intended object type and populates public properties.

Reference Parameter Binding in ASP.NET Web API