How can one get an absolute or normalized file path in .NET?

问题

How can one with minimal effort (using some already existing facility, if possible) convert paths like c:\\aaa\\bbb\\..\\ccc to c:\\aaa\\ccc?

回答1:

Path.GetFullPath perhaps?

回答2:

I would write it like this:

public static string NormalizePath(string path)
{
    return Path.GetFullPath(new Uri(path).LocalPath)
               .TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar)
               .ToUpperInvariant();
}

This should handle few scenarios like

1. uri and potential escaped characters in it, like

   file:///C:/Test%20Project.exe -> C:\TEST PROJECT.EXE

2. path segments specified by dots to denote current or parent directory

   c:\aaa\bbb\..\ccc -> C:\AAA\CCC

3. tilde shortened (long) paths

   C:\Progra~1\ -> C:\PROGRAM FILES

4. inconsistent directory delimiter character

   C:/Documents\abc.txt -> C:\DOCUMENTS\ABC.TXT

Other than those, it can ignore case, trailing \ directory delimiter character etc.

回答3:

Canonicalization is one of the main responsibilities of the Uri class in .NET.

var path = @"c:\aaa\bbb\..\ccc";
var canonicalPath = new Uri(path).LocalPath; // c:\aaa\ccc

来源：https://stackoverflow.com/questions/1266674/how-can-one-get-an-absolute-or-normalized-file-path-in-net