Getting Absolute URL from an ASP.NET MVC Action

Question

This probably is a dummy question but I cannot find a clear indication. I have a POCO class in a MVC3 web application whose only purpose is managing the backup of some files in the server. Typically it creates a backup and returns the filename to the controller, which sends an email with the URL for downloading it. This works fine, but I cannot build the absolute URL to be sent. No matter which function I use, I always get a relative URL, like /Backup/TheFile.zip, rather than e.g. http://www.somesite.com/Backup/TheFile.zip. I tried:

VirtualPathUtility.ToAbsolute("~/Backup/SomeFile.zip"); HttpRuntime.AppDomainAppVirtualPath + "/Backup/SomeFile.zip"; Url.Content("~/Backup/SomeFile.zip"); 

but they all return something like /Backup/SomeFile.zip. Any idea?

Answer 1

You can do it by the following:

var urlBuilder =     new System.UriBuilder(Request.Url.AbsoluteUri)         {             Path = Url.Action("Action", "Controller"),             Query = null,         };  Uri uri = urlBuilder.Uri; string url = urlBuilder.ToString(); // or urlBuilder.Uri.ToString() 

Instead of Url.Action() in this sample, you can also use Url.Content(), or any routing method, or really just pass a path.

But if the URL does go to a Controller Action, there is a more compact way:

var contactUsUriString =     Url.Action("Contact-Us", "About",                routeValues: null /* specify if needed */,                protocol: Request.Url.Scheme /* This is the trick */); 

The trick here is that once you specify the protocol/scheme when calling any routing method, you get an absolute URL. I recommend this one when possible, but you also have the more generic way in the first example in case you need it.

I have blogged about it in details here:
http://gurustop.net/blog/2012/03/23/writing-absolute-urls-to-other-actions-in-asp-net-mvc/

Extracted from Meligy’s AngularJS & Web Dev Goodies Newsletter

Answer 2

From within the controller:

var path = VirtualPathUtility.ToAbsolute(pathFromPoco); var url = new Uri(Request.Url, path).AbsoluteUri