Question

Here’s the method of the controller

public class FeedController : ControllerBase
    {

        public RssActionResult Rss()
        {
          //........

            List<SyndicationItem> items = new List<SyndicationItem>();
            var photosList = Facade.Photos.Get()
                .Select(x =>
                    new SyndicationItem(
                        x.Title, 
                        x.PreviewPath,
                        new Uri("http://site.com/"+CurrentLocale.CultureName+"/photos/show/" + x.ID + ".html"), x.ID.ToString(),
                        DateTime.UtcNow)
                        );
            //........
            return new RssActionResult() { Feed = feed };
        }

    }

How can I avoid the hardcoding of the Uri?

UPDATE

 routes.MapRouteLowercase(
                "Photos_Route",
                "{culture}/photos/{action}/{id}.html",
                new { controller = "photos", action = "show", culture = defaultCulture }
                );

Answer 1

If the URI is a resource on your own site, and if you have a route defined for it, you can use something similar to this:

Url.RouteUrl(new RouteValueDictionary{ {"controller","Photo"}, {"action","show"}, {"Id",x.ID} })

There are several overrides for the RouteUrl method.

Otherwise, if that URI is a resource on some other site, you can just store the URI format in web.config, and use string.Format(urlFormatFromWebConfig, x.ID) to generate the URL.

EDIT: More specific, now that you updated with your Route:

new Uri(Url.RouteUrl("Photos_Route", new RouteValueDictionary{ {"culture", CurrentLocale.CultureName}, {"ID", x.ID.ToString()} });