ASP.NET Core ApiVersioning change middleware hierarchy

Question

I have a problem with middleware hierarchy. I created very simple web api with one controller/action

[Route("api/v1/values")]
  public class ValuesController : Controller
  {
    // GET api/v1/values/5
    [HttpGet("{id}")]
    public async Task<IActionResult> Get(string id)
    {
      return await Task.Run<IActionResult>(() =>
      {
        if (id == "nf")
        {
          return NotFound();
        }

        return Ok($"value: {id}");
      });
    }
  }

I configured routing to use Mvc if match or write Default to response if not.

app.UseMvc();

app.Use(async (context, next) =>
{
  await context.Response.WriteAsync("Default");
});

And this works great, below you can see sample requests/responses:

/api/v1/values/1 -> 200, Body: "value: 1"
/api/v1/values/nf -> 404
/api/v1/values -> "Default"

Great, but then I added ApiVersioning, so controller looks like this:

[ApiVersion("1")]
[Route("api/v{version:apiVersion}/values")]
public class ValuesController : Controller

and I added to Startup : services.AddApiVersioning();. It break routing completely, now for each request i get response "Default", when i remove last app.Use, routing works fine for values controller, but i don't have default middleware. Do you know how i can get responses the same as prevously, but with ApiVersioning?

Answer 1

Try this.

[ApiVersion("1.0")]
[Route("api/v{version:apiVersion}/foo")]
public class FooController {}

and in Startup class

 public void ConfigureServices(IServiceCollection services)
        {
            services.AddApiVersioning(options =>
            {
                options.ReportApiVersions = true;
                options.AssumeDefaultVersionWhenUnspecified = true;
                options.DefaultApiVersion = new ApiVersion(1, 0);
            });
        }

I have tried and it worked for me.