How to force web API to recognise querystring parameter

Question

ASP.NET MVC4 Web API v1 controller is defined below. It should accept 1 or 2 query string parametrs.

However ko parameter is always null if method is called. Request is

Answer 1

Complex types are fetched from the body of a request, but you can change this default behaviour like this :

public HttpResponseMessage Get([FromUri]CustomersSearchViewModel ko)

Your querystring should contain parameters named like your model properties, otherwise the binding won't work.