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

Another option is to implement a custom type provider. This allows control over the representation in the query string, and means you don't have to add the [FromUri] attribute to your action methods. This makes sense if you have widespread reuse of a complex parameter type, or need a custom representation.

A good example of this is given in this blog post where a location with latitude and longitude is implemented using both techniques.

Answer 2

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.