Get absolute path from relative path c#

Question

I have a file in a folder somewhere on my computer and I have a second file where the relative path to the first file is noticed.

Now I want to figure out the absolute path.

GetFullPath doesn't work because the second file is not in the directory where the program runs.

Is there an opportunity to say from which directory the "GetFullPath" function should start, to get the right absolute path?

Have you tried this: http://stackoverflow.com/questions/4796254/relative-path-to-absolute-path-in-c?rq=1 — Versatile, Aug 04 '16 at 16:51
or this: http://stackoverflow.com/questions/1399008/how-to-convert-a-relative-path-to-an-absolute-path-in-a-windows-application?noredirect=1&lq=1 — Versatile, Aug 04 '16 at 16:51

score 6 · Accepted Answer · edited May 04 '23 at 15:34

6

You can use the static methods of Path to calculate the resulting path:

string fullPathToSecondFile = "c:\\test\\subtestsecond\\secondfile.txt";
string relativePath = "..\\subtestfirst\\firstfile.txt";

string fullPathToFirstFile = Path.GetFullPath(Path.Combine(Path.GetDirectoryName(fullPathToSecondFile), relativePath));

This results in c:\test\subtestfirst\firstfile.txt

What happens is that you combine a relative path to a absolute one. This results in c:\test\subtestsecond\..\subtestfirst\firstfile.txt.
In the second step Path.GetFullPath() normalizes the string to the result shown above.

edited May 04 '23 at 15:34

Lord Darth Vader

1,895
1
17
26

answered Aug 04 '16 at 16:55

René Vogt

43,056
14
77
99

this is mind blowing, you don't think it will work until you see it in action. Thanks man. – Fernando Wolff Dec 15 '22 at 12:35

Get absolute path from relative path c#

1 Answers1

Linked