CODEWITHSUNDEEP
c#.net
user1765862
user1765862

Reputation: 14185

determine file extension in c#

Right now I'm getting file as a string and I need to iterate through every known ex. case to grab it's file extension.

How can I determine file extension in runtime using c# without iterating for expected?

Upvotes: 0

Views: 271

Answers (9)

Soner Gönül
Soner Gönül

Reputation: 98848

You can use Path.GetExtension() method.

The extension of the specified path (including the period "."), or null, or String.Empty. If path is null, GetExtension returns null. If path does not have extension information, GetExtension returns String.Empty.

string p = @"C:\Users\Sam\Documents\Test.txt";

string e = Path.GetExtension(p);
if (e == ".txt")
{
    Console.WriteLine(e);
}

Path.GetExtension checks the entire path for invalid chars. This step is redundant if you already know your path is valid, such as when you received it from Directory.GetFiles. It looks for a separator char. The implementation checks for DirectorySeparatorChar, AltDirectorySeparatorChar, and VolumeSeparatorChar.

Upvotes: 2

TalentTuner
TalentTuner

Reputation: 17556

Use Path.GetExtension(path) it can be helpful.

Upvotes: 0

il_guru
il_guru

Reputation: 8508

You can use the System.IO.FileInfo Class.
It has a property called Extension which gives you a string containing the extension part of the file name.

FileInfo file = new FileInfo("myfile.txt")
string fileExtension = file.Extension;

Upvotes: 1

Jonas W
Jonas W

Reputation: 3260

An alternative way in finding it..

var file = new FileInfo("myPath");
var extension = file.Extension;

So for example if we wanna take all txt files from a directory we can do like this :

var directory = new DirectoryInfo("myFolder");
var filesWithTxtExtension = directory.GetFiles().Where(file => file.Extension == ".txt");

Upvotes: 1

jordanhill123
jordanhill123

Reputation: 4182

string path = Path.GetExtension(filePath);

From MSDN - Path.GetExtension Method

Upvotes: 0

User2012384
User2012384

Reputation: 4917

string getFileExtension (string Path)
{
return Path.GetExtension(Path);
}

Upvotes: 0

lc.
lc.

Reputation: 116528

Use Path.GetExtension:

string extension = Path.GetExtension(@"C:\myfile.txt");

Or, did you mean you want to search for a file with a given base name and any extension? You can use Directory.GetFiles:

string[] files = Directory.GetFiles(@"C:\", "myfile.*")

Upvotes: 1

Adriaan Stander
Adriaan Stander

Reputation: 166506

Have you tried using something like

Path.GetExtension()

The extension of the specified path (including the period "."), or null, or String.Empty. If path is null, GetExtension returns null. If path does not have extension information, GetExtension returns String.Empty.

Upvotes: 2

Habib
Habib

Reputation: 223392

Use Path.GetExtension method provided by the framework.

The extension of the specified path (including the period "."), or null, or String.Empty. If path is null, GetExtension returns null. If path does not have extension information, GetExtension returns String.Empty.

string extension = Path.GetExtension(@"C:\mydir\file.exe");

You will get .exe

Upvotes: 12

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