Converting a URI path to a relative file system pa

Question

How do I convert an absolute or relative URI path (e.g. /foo/bar.txt) to a (segmentwise) corresponding relative file system path (e.g. foo\bar.txt) in .NET?

My program is not an ASP.NET application.

Answer 1

Have you already tried Server.MapPath?
or Uri.LocalPath property? Something like following :

string uriString = "file://server/filename.ext";
// Lesson learnt - always check for a valid URI
if(Uri.IsWellFormedUriString(uriString))
{
    Uri uri = new Uri(uriString);
    Console.WriteLine(uri.LocalPath);
}

Answer 2

You can do this:

var localPath = Server.MapPath("/foo/bar.txt");

See MSDN for details

Answer 3

I figured out this way to produce a full absolute file system path from a relative or absolute URI and a base path.

With:

Uri basePathUri = new Uri(@"C:\abc\");

From a relative URI:

string filePath = new Uri(basePathUri, relativeUri).AbsolutePath;

From an absolute URI:

// baseUri is a URI used to derive a relative URI
Uri relativeUri = baseUri.MakeRelativeUri(absoluteUri);
string filePath = new Uri(basePathUri, relativeUri).AbsolutePath;