GetFiles with multiple extensions [duplicate]

by

Why not create an extension method? That’s more readable.

public static IEnumerable<FileInfo> GetFilesByExtensions(this DirectoryInfo dir, params string[] extensions)
{
    if (extensions == null) 
         throw new ArgumentNullException("extensions");
    IEnumerable<FileInfo> files = Enumerable.Empty<FileInfo>();
    foreach(string ext in extensions)
    {
       files = files.Concat(dir.GetFiles(ext));
    }
    return files;
}

EDIT: a more efficient version:

public static IEnumerable<FileInfo> GetFilesByExtensions(this DirectoryInfo dir, params string[] extensions)
{
    if (extensions == null) 
         throw new ArgumentNullException("extensions");
    IEnumerable<FileInfo> files = dir.EnumerateFiles();
    return files.Where(f => extensions.Contains(f.Extension));
}

Usage:

DirectoryInfo dInfo = new DirectoryInfo(@"c:\MyDir");
dInfo.GetFilesByExtensions(".jpg",".exe",".gif");

More Related Contents:

  1. Can I show file copy progress using FileInfo.CopyTo() in .NET?
  2. .NET FileInfo.LastWriteTime & FileInfo.LastAccessTime are wrong
  3. What is the ‘dynamic’ type in C# 4.0 used for?
  4. How can I run an EXE program from a Windows Service using C#?
  5. How do I fix a .NET windows application crashing at startup with Exception code: 0xE0434352?
  6. Remove text in-between delimiters in a string (using a regex?)
  7. Does a locked object stay locked if an exception occurs inside it?
  8. namespace naming conventions
  9. Request.UrlReferrer null?
  10. A dictionary object that uses ranges of values for keys
  11. Is it possible to Embed Gecko or Webkit in a Windows Form just like a WebView?
  12. The State of Linkers for .NET apps (aka “Please Sir, May I have a Linker” 2009 edition)
  13. How to hide public methods from IntelliSense
  14. thread with multiple parameters
  15. How to set a proxy for Webbrowser Control without effecting the SYSTEM/IE proxy
  16. Table name and table field on SqlParameter C#?
  17. System.Timers.Timer Elapsed event executing after timer.Stop() is called
  18. Why can I use a collection initializer with private set access from another class?
  19. How can I include line numbers in a stack trace without a pdb?
  20. Data binding for TextBox
  21. Create object instance of a class from its name in string variable
  22. Method to determine if path string is local or remote machine
  23. Multiples Table in DataReader
  24. How to sort list of Ip Addresses using c#
  25. Are static members of a generic class tied to the specific instance?
  26. How do I find out what directory my console app is running in?
  27. How do I get .NET to garbage collect aggressively?
  28. Get the property name used in a Lambda Expression in .NET 3.5
  29. splitting a string based on multiple char delimiters
  30. What is the “base class” for numeric value types?

Leave a Comment