How to filter Directory.EnumerateFiles with multiple criteria?

user_6536 0
Viewed 92343

I have the following code:

List<string> result = new List<string>();

foreach (string file in Directory.EnumerateFiles(path,"*.*",  
      SearchOption.AllDirectories)
      .Where(s => s.EndsWith(".mp3") || s.EndsWith(".wma")))
       {
          result.Add(file);                 
       }

It works fine and does what I need. Except for one small thing. I would like to find a better way to filter on multiple extensions. I would like to use a string array with filters such as this:

string[] extensions = { "*.mp3", "*.wma", "*.mp4", "*.wav" };

What is the most efficient way to do this using NET Framework 4.0/LINQ? Any suggestions?

I'd appreciate any help being an occasional programmer :-)

.net c#
8 Answers

I solved this problem this way:

string[] formats = {".mp3", ".wma", ".mp4"};

foreach (var file in Directory.EnumerateFiles(folder, "*.*", SearchOption.AllDirectories).Where(x => formats.Any(x.EndsWith)))
{
    // TODO...
}
user_65511410

For Filtering using the same File Extensions list strings as GUI Open Dialogs e.g.:

".exe,.pdb".Split(',', ';', '|').SelectMany(_ => Directory.EnumerateFiles(".", "*" + _, searchOptions)

Packaged up:

    public static IEnumerable<string> EnumerateFilesFilter(string path, string filesFilter, SearchOption searchOption = SearchOption.TopDirectoryOnly)
    {
        return filesFilter.Split(',', ';', '|').SelectMany(_ => Directory.EnumerateFiles(path, "*" + _, searchOption));
    }
user_84246800

Beginning from the NET Core 2.1 and .NET Standard 2.1 there is built-in class FileSystemName: documentation, source code which provides methods for matching file system names:

Example:

public static IEnumerable<string> EnumerateFiles(string path, string[] searchPatterns, SearchOption searchOption = SearchOption.TopDirectoryOnly)
{
    return Directory.EnumerateFiles(path, "*", searchOption)
                    .Where(fileName => searchPatterns.Any(pattern => FileSystemName.MatchesSimpleExpression(pattern, fileName)));
}

I've adapted the existing source code of FileSystemName to be used in .NetFramework 4: Gist FileSystemName for .NetFramework 4.

user_79011670
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