MVC 5 Web Api - Inheriting route from base controller

Here's what works:

public abstract class BaseUploaderController : ApiController
{
    [HttpGet, Route("uploadfile")] //Needs both because HttpGet("uploadfile") currently only supported in MVC attribute routing 
    public string UploadFile() 
    {
        return "UploadFile";
    }
}


[RoutePrefix("api/values")]
public class ValuesController : BaseUploaderController
{
    [Route("{id:int}")]
    public string Get(int id)
    {
        return "value";
    }
}

Are you looking to place this UploadFile action in the base controller and other controllers inheriting from them should still be able to hit UploadFile from their respective routes like you mentioned in your post? If yes, you could create an abstract base api controller and place this UploadFile action in it and your requests to the individual controllers should work as expected.

Example:

public abstract class BaseApiController : ApiController
{
    // POST /api/Values
    // POST /api/Test
    public string UploadFile()
    {
        return "UploadFile";
    }
}

public class TestController : BaseApiController
{
    // GET /api/test/10
    public string GetSingle(int id)
    {
        return "Test.GetSingle";
    }
}

public class ValuesController : BaseApiController
{
    // GET /api/values/10
    public string GetSingle(int id)
    {
        return "Values.GetSingle";
    }
}

As per this answer https://stackoverflow.com/a/21610390/122507 attribute routes are not inherited.

I am currently debating between introducing unnecessary method in 30 controllers just so I can add an attribute route or add a fake parameter to the base class method to let the default routing disambiguate between Get(int id) and GetHistory(int id, bool history) where I don't need the second parameter.