ASP.NET Web API: Using Namespaces to Version Web APIs

In this post, I’ll show how to extend the routing logic in ASP.NET Web API, by creating a custom controller selector. Suppose that you want to version your web API by defining URIs like the following: /api/v1/products/ /api/v2/products/ You might try to make this work by creating two different “Products” controllers, and placing them in separate namespaces: namespace MyApp.Controllers.V1 { // Version 1 controller public class ProductsController : ApiController { } } namespace MyApp.Controllers.V2 { // Version 2 controller public class ProductsController : ApiController { } } The problem with this approach is that Web API finds controllers by class name, ignoring the namespace. So there’s no way to make this work using...(read more) ...