Get http url path of local file on server in asp.net

I'm using ASP.NET with MVC 2 and have trouble translating a local file url to a server address. It would seem like a fairly simple and common task, but google searches gives me no good answers. (Perhaps i suck at searching)

I have a controller that takes a file from a 开发者_如何学Gohtml form in a view and saves it to disk. I need to return the real url of this file back to the View. Whatever method i use, I always get a string with the local path of the file instead of the http path.

I suspect the url might get translated to http address once the project has been deployed, but I really need the server address when debugging without having to hardcode anything.

Consider the following example in some controller method:

string url = Url.RequestContext.HttpContext.Server.MapPath("~/Content/Files/" + Path.GetFileName(file.FileName));
// outputs: "C:\\Users\\xxx\\Documents\\Visual Studio 2010\\Projects\\[ProjectName]\\Content\\Files\\file.png"
// whereas i'd like something like "http://localhost/Content/Files/file.png" instead

any ideas?

It depends on where you are storing this file. If you are storing it in a directory which is outside of the virtual directory root you won't be able to access it. If the file is inside a folder which is accessible over HTTP you could simply use the Content method:

string url = Url.Content("~/Content/Files/foo.txt");