Search For Multiple File Extensions?

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Through this site I have figured out my recent problem when trying to scan for file extensions such as "*.txt", but I cannot figure out how to scan for multiple file types such as ".txt" and ".exe" at the same time?

The code that works for a single file extension at a time is:

VB

dim FExtension as string = "*.txt"
 For Each file1 In IO.Directory.GetFiles(dir, FExtension)

How can I add?

C#

dim FExtension as string = "*.txt" and '*.exe" and "*.sys"

and so forth?

Thank you in advance for your help! :)

Posted 6-Oct-11 20:40pm

Dale 2012

Updated 1-Jul-16 6:29am

André Kraak

v2

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4 solutions

Solution 1

You can't.

GetFiles method only accepts one option in the overload.

Either run it twice with a different extension, or, run it without the filter and afterward filter the result in a loop.

Posted 6-Oct-11 21:32pm

Dalek Dave

Solution 2

You could use LinQ to retrieve all files with multiple extensions like this:-

C#

var files = Directory.GetFiles(@"C:\yourPath", "*.*", SearchOption.AllDirectories).
                Where(s => s.EndsWith(".txt", StringComparison.OrdinalIgnoreCase) || s.EndsWith(".doc", StringComparison.OrdinalIgnoreCase));

Just be aware that the original query will return all files in yourPath, so if you pass in say C:\ you will start getting performance issues.

Posted 6-Oct-11 21:33pm

Wayne Gaylard

Solution 4

C#

Dim supportedExtensions As String = "*.zip,*.aaa,*.bbb,*.ccc,*.ddd"
Dim files As String() = Directory.GetFiles(romPath, "*.*", SearchOption.AllDirectories)
Array.Sort(files)

For Each fi As String In files
 If supportedExtensions.Contains(Path.GetExtension(fi)) Then
 ...
 End If
Next

Posted 1-Jul-16 6:29am

Member 12614308

Comments

Richard MacCutchan 1-Jul-16 13:28pm

Please do not post in old questions; this one is nearly 5 years old.

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ledtech3 · Accepted Answer · 2011-10-09T08:17:00

I would try to recurse thru the file extensions something like this.
Be Warned though it will take some time to return all of the information even for just 1 file extension if you choose a root start location.

VB

Dim FExtension1 As String = "*.txt"
Dim FExtension2 As String = "*.exe"
Dim FExtension3 As String = "*.sys"

For Each file1 In IO.Directory.GetFiles(Dir, FExtension1)
    ' add to list box or append to text box or a Datagridview
Next

For Each file1 In IO.Directory.GetFiles(Dir, FExtension2)
    ' add to list box or append to text box or a Datagridview
Next

For Each file1 In IO.Directory.GetFiles(Dir, FExtension3)
    ' add to list box or append to text box or a Datagridview
Next