ASP.NET Core - get route from controller type

Question

How can I get route from controller type?

for example get route of MyTestController & LoosedController from kind of service or something else.

XService.GetRoute<MyTestController>(); // output: /api/x/MyTest
XService.GetRoute<LoosedController>(); // output: /api/loosed-items

[Route("api/x/[controller]")]
public abstract class MyControllerBase : ControllerBase {
    [HttpGet("{id}")]
    public ActionResult Get(int id) {
        return Ok(id);
    }
}

[Route("api/loosed-items")]
public class LoosedController : MyControllerBase {
}

public class MyTestController : MyControllerBase {
    [HttpGet("action")]
    public ActionResult FindThis() {
        return Ok();
    }
}

@SSD i just have controller type, i must take route just with Type. — Mo3in
– Mo3in, Commented Aug 18, 2020 at 10:11
You can use reflection logic and retrieve what you want. check this - stackoverflow.com/questions/21583278/… — SSD
– SSD, Commented Aug 18, 2020 at 10:21
@SSD its not useful, reflaction cant handle routeTemplate and RouteAttribute inheritance — Mo3in
– Mo3in, Commented Aug 18, 2020 at 10:38

Brando Zhang · Accepted Answer · 2020-08-18 12:36:58Z

According to your description, you could try to use IActionDescriptorCollectionProvider to get all controller routes.

More details, you could refer to below codes:

Interface:

public interface IGetRoute
{
    IList<RouteModel> GetRotue(string type);
}

Class: public class GetRoute : IGetRoute { private readonly IActionDescriptorCollectionProvider _actionDescriptorCollectionProvider;

    public GetRoute(IActionDescriptorCollectionProvider actionDescriptorCollectionProvider)
    {
        _actionDescriptorCollectionProvider = actionDescriptorCollectionProvider;
    }


    public IList<RouteModel> GetRotue(string type)
    {

        var typename = type.Replace("Controller", "");

        List<RouteModel> result = new List<RouteModel>();

        foreach (ActionDescriptor _e in _actionDescriptorCollectionProvider.ActionDescriptors.Items)
        {

            if (_e.AttributeRouteInfo != null)
            {
                if (_e.AttributeRouteInfo.Template.Contains(typename))
                {
                    result.Add(new RouteModel() { Name = _e.AttributeRouteInfo.Template, ControllerName = typename });
                }
            } else if (_e is ControllerActionDescriptor)
            {
                var e = _e as ControllerActionDescriptor;
                if (e.ControllerName == typename)
                {
                    result.Add(new RouteModel() { Name = $"/{e.ControllerName}/{e.ActionName}", ControllerName = typename });
                }

            }


        }

        return result;
    }
}

Register in ConfigureServices method:

        services.AddScoped<IGetRoute, GetRoute>();

Usage:

        var res = _route.GetRotue(typeof(MyTestController).Name);

        var res2 = _route.GetRotue(typeof(HomeController).Name);

Result:

This answer fails to take into account the route template and associated values.

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