C# create file with same name as folder name, with extension

Question

Suppose I have a folder called test.
Now I pass that folder into a program and it will output a file called test.xyz in the same directory that contains the target folder.

The general logic I'm using is something like

string outDir = Path.GetDirectoryName(path);
string outName = Path.GetFileName(path).TrimEnd("\\".ToCharArray()) + ".xyz";
string outFile = Path.Combine(outDir, outName);

Which works, but it seems kind of excessive to perform so many operations just to build my new filename.

1: Can I reduce the number of Path calls to achieve my result?
2: Can I do something about the second line to avoid trimming and also avoid using that add operation?

Please let us know whether an answer was helpful.

Mare Infinitus
– Mare Infinitus

2012-06-10 21:01:34 +00:00
Commented Jun 10, 2012 at 21:01 — Mare Infinitus
– Mare Infinitus, Commented Jun 10, 2012 at 21:01

sblom · Accepted Answer · 2012-06-10 20:01:32Z

2

This seems to work in my quick tests:

string outFile = Path.GetFullPath(path) + ".xyz";

Although I just realized your path may include a trailing slash already. If you can't change it to avoid that, you'll still have to include the .TrimEnd() call.

In my test, I'm using var path = @"C:\Windows\System32";.

answered Jun 10, 2012 at 20:01

sblom

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2 Comments

Filip Over a year ago

in addition to this, you can use Path.Combine to avoid trimming

james Over a year ago

@sblom, use @"C:\windows\system32" as test path seemed not safe. lol

Mare Infinitus · Accepted Answer · 2012-06-10 20:10:26Z

0

You could use a FileInfo for that!

string path = @"C:\Windows\System32\";
FileInfo fi = new FileInfo(path);
string outFile = fi.DirectoryName + ".xyz";

works like a charm. even with trailing slash in the directory string

answered Jun 10, 2012 at 20:10

Mare Infinitus

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