Changing Route attribute value dynamically in ASP.NET CORE

Question

I am looking for a way to grammatically change the value of Route attribute.

I have a scenario where the api route should be either :

[Route("api/v1/[Controller]")] or
[Route("api/xyz/v1/[Controller]")]

based on whether I am running it in debug mode or not.

[Route("api/v1/[Controller]")]
[ApiController]  
public class MyController : BaseController
{
}

I tried adding a variable in Base Controller but realized that I can't access it in Route attribute.

You can't change the value of a Attribute after compilation, however, the ConditionalAttribute exists, you may be able to work something out with it — MindSwipe
– MindSwipe, Commented Feb 3, 2020 at 7:06

MindSwipe · Accepted Answer · 2020-02-03 07:16:59Z

4

You cannot change the value of an attribute after compilation, as attributes are compile time constants. That's also why you can't use a variable from you controller class as a parameter (unless it is const)

Instead, you can use preprocessor directives to do this like so

#if DEBUG
[Route("api/v1/[Controller]")]
#else
[Route("api/xyz/v1/[Controller]")]
#endif

(You may want to change it around to if RELEASE and also change to routes)

answered Feb 3, 2020 at 7:16

MindSwipe

8,0441 gold badge27 silver badges59 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

SamuraiJack Over a year ago

Though I must agree that it may work but is there by any chance a neater solution?

MindSwipe Over a year ago

The neatest solution would be to not need different routes in different circumstances, but there are reasons for everything. A somewhat neater solution may be to do what Kiksen said and not use attribute routing and instead specify the routes in the Startup.cs

Kiksen · Accepted Answer · 2020-02-03 07:06:35Z

0

You can do this in your startup.cs

app.UseMvc(routes =>
{
   routes.MapRoute("default", "api/{controller=Home}/{action=Index}/{id?}");
});

Simply make a if statement for debug.

app.UseMvc(routes =>
{
   routes.MapRoute("default", "api/xyz/{controller=Home}/{action=Index}/{id?}");
});

Or UseControllers or whatever you are using.

answered Feb 3, 2020 at 7:06

Kiksen

1,8392 gold badges24 silver badges47 bronze badges

Collectives™ on Stack Overflow

Changing Route attribute value dynamically in ASP.NET CORE

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related