How do I convert a file path to a URL in ASP NET

Question

Basically I have some code to check a specific directory to see if an image is there and if so I want to assign a URL to the image to an ImageControl   if  System IO Directory Exists photosLocation         string   files   System IO Directory GetFiles photosLocation     jpg        if  files Length  gt  0                   TODO  return the url of the first file found

User · Answer

The problem with all these answers is that they do not take virtual directories into account.

Consider:

Site named "tempuri.com/" rooted at c:\domains\site
virtual directory "~/files" at c:\data\files
virtual directory "~/files/vip" at c:\data\VIPcust\files

So:

Server.MapPath("~/files/vip/readme.txt") 
  = "c:\data\VIPcust\files\readme.txt"

But there is no way to do this:

MagicResolve("c:\data\VIPcust\files\readme.txt") 
   = "http://tempuri.com/files/vip/readme.txt"

because there is no way to get a complete list of virtual directories.

User · Answer

For get the left part of the URL    HttpContext Current Request Url GetLeftPart UriPartial Authority   http   localhost 1714    For get the application  web  name    HttpRuntime AppDomainAppVirtualPath       With this  you are available to add your relative path after that obtaining the complete URL

User · Answer

As far as I know  there s no method to do what you want  at least not directly  I d store the photosLocation as a path relative to the application  for example     Images    This way  you could use MapPath to get the physical location  and ResolveUrl to get the URL  with a bit of help from System IO Path    string photosLocationPath   HttpContext Current Server MapPath photosLocation   if  Directory Exists photosLocationPath         string   files   Directory GetFiles photosLocationPath     jpg        if  files Length  gt  0                string filenameRelative   photosLocation    Path GetFilename files 0              return Page ResolveUrl filenameRelative

User · Answer

this is what i use   private string MapURL string path        string appPath   Server MapPath      ToLower        return string Format    0    path ToLower   Replace appPath      Replace

User · Answer

This worked for me   HttpContext Current Request Url GetLeftPart UriPartial Authority    HttpRuntime AppDomainAppVirtualPath    ImageName

User · Answer

I think this should work  It might be off on the slashes   Not sure if they are needed or not   string url   Request ApplicationPath         photosLocation         files 0

User · Answer

I ve accepted Fredriks answer as it appears to solve the problem with the least amount of effort however the Request object doesn t appear to conatin the ResolveUrl method  This can be accessed through the Page object or an Image control object   myImage ImageUrl   Page ResolveUrl photoURL   myImage ImageUrl   myImage ResolveUrl photoURL     An alternative  if you are using a static class as I am  is to use the VirtualPathUtility   myImage ImageUrl   VirtualPathUtility ToAbsolute photoURL

User · Answer

So far as I know there s no single function which does this  maybe you were looking for the inverse of MapPath    I d love to know if such a function exists  Until then  I would just take the filename s  returned by GetFiles  remove the path  and prepend the URL root  This can be done generically

User · Answer

The simple solution seems to be to have a temporary location within the website that you can access easily with URL and then you can move files to the physical location when you need to save them

User · Answer

Maybe this is not the best way  but it works      Here is your path String p   photosLocation    whatever jpg       Here is the page address String pa   Page Request Url AbsoluteUri      Take the page name     String pn   Page Request Url LocalPath      Here is the server address     String sa   pa Replace pn           Take the physical location of the page     String pl   Page Request PhysicalPath      Replace the backslash with slash in your path     pl   pl Replace                 p   p Replace                 Root path      String rp   pl Replace pn           Take out same path     String final   p Replace rp           So your picture s address is     String path   sa   final    Edit  Ok  somebody marked as not helpful  Some explanation  take the physical path of the current page  split it into two parts  server and directory  like c  inetpub whatever com whatever  and page name  like  Whatever aspx   The image s physical path should contain the server s path  so  substract  them  leaving only the image s path relative to the server s  like   design picture jpg   Replace the backslashes with slashes and append it to the server s url

[asp.net] How do I convert a file path to a URL in ASP.NET

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