Web API complex parameter properties are all null

Question

I have a Web API service call that updates a user\'s preferences. Unfortunately when I call this POST method from a jQuery ajax call, the request parameter object\'s proper

Answer 1

I guess problem is that your controller is expecting content type of [FromBody],try changing your controller to

public HttpResponseMessage Post(PreferenceRequest request)

and ajax to

$.ajax({
    type: "POST",
    data: JSON.stringify(request);,
    dataType: 'json',
    contentType: "application/json",
    url: "http://localhost:1111/service/User",

By the way creating model in javascript may not be best practice.