Attribute Routing for ApiControllers from external assembly

Question

I have a large ASP.NET MVC 5 application, and now I want to implement Web API for it. But I want to put ApiControllers in a separate project. I have problem with organizing routes for the Web API: I want my main application Routes by ``` host/* ``` And the API maps on ``` host/api/* ``` And for the API, I want to use Attribute Routing, but can't setup WebApiConfig with proper way. How to organize this, retaining the ability to use "Attribute Routing"?

Accepted Answer

I found the solution:

For ApiControllers it is not necessary to reimplement Factories.

In project Web (main), we need:

Add dependency to project with ApiControllers

Edit Global.asax this way

replace:

```
WebApiConfig.Register(GlobalConfiguration.Configuration);
```

to

```
GlobalConfiguration.Configure(WebApiConfig.Register);
```

in WebApiConfig.Register

```
config.MapHttpAttributeRoutes();
```

to enable Attribute Routing.

Now the Web API engine can find all ApiControllers in the Scope.

Attribute Routing for ApiControllers from external assembly

Solution

Problem