Converting physical path to relative one in respect of http://localhost:

Question

I use asp.net 4 and c#.

I have this code that allow me to find the physical path for an image. As you can see I get my machine physical pagh file:///C:.

string pathRaw = HttpContext.Current.Request.PhysicalApplicationPath + "Statics\\Cms\\Front-End\\Images\\Raw\\";

Result:

file:///C:/......../f005aba1-e286-4d9e-b9db-e6239f636e63.jpg

But I need display this image at the Front end of my web application so I would need a result like this:

http://localhost:1108/Statics/Cms/Front-End/Images/Raw/f005aba1-e286-4d9e-b9db-e6239f636e63.jpg

How to do it?

PS: I need to convert the result of variable pathRaw.

Hope I was able to express myself unfortunately I'm not sure about terminology in this case.

Thanks for your help!

Answer 1

The easiest thing to do is get rid of the physical application path. If you cannot do that in your code, just strip it off the pathRaw variable. Like this:

public string GetVirtualPath( string physicalPath )
{
   if ( !physicalPath.StartsWith( HttpContext.Current.Request.PhysicalApplicationPath ) )
   {
      throw new InvalidOperationException( "Physical path is not within the application root" );
   }

   return "~/" + physicalPath.Substring( HttpContext.Current.Request.PhysicalApplicationPath.Length )
         .Replace( "\\", "/" );
}

The code first checks to see if the path is within the application root. If not, there's no way to figure out a url for the file so an exception is thrown.

The virtual path is constructed by stripping off the physical application path, convert all back-slashes to slashes and prefixing the path with "~/" to indicate it should be interpreted as relative to the application root.

After that you can convert the virtual path to a relative path for output to a browser using ResolveClientUrl(virtualPath).

Answer 2

Get the root of your application using Request.ApplicationPath then use the answer from this question to get a relative path.

It might need a bit of tweaking but it should allow you to do what you're after.