GetFiles with multiple extensions

Question

Possible Duplicate    Can you call Directory GetFiles   with multiple filters        How do you filter on more than one extension   I ve tried   FileInfo   Files   dinfo GetFiles    jpg   tiff   bmp    FileInfo   Files   dinfo GetFiles    jpg   tiff   bmp

User · Answer

I know there is a more elegant way to do this and I m open to suggestions    this is what I did             try                                 Set directory for list to be made of                 DirectoryInfo jpegInfo   new DirectoryInfo destinationFolder                   DirectoryInfo jpgInfo   new DirectoryInfo destinationFolder                   DirectoryInfo gifInfo   new DirectoryInfo destinationFolder                   DirectoryInfo tiffInfo   new DirectoryInfo destinationFolder                   DirectoryInfo bmpInfo   new DirectoryInfo destinationFolder                       Set file type                 FileInfo   Jpegs   jpegInfo GetFiles    jpeg                    FileInfo   Jpgs   jpegInfo GetFiles    jpg                    FileInfo   Gifs   gifInfo GetFiles    gif                    FileInfo   Tiffs   gifInfo GetFiles    tiff                    FileInfo   Bmps   gifInfo GetFiles    bmp                 listBox1 Items Add           Hack for the first list item no preview problem            Iterate through each file  displaying only the name inside the listbox            foreach  FileInfo file in Jpegs                            listBox1 Items Add file Name                   Photo curPhoto   new Photo                    curPhoto PhotoLocation   file FullName                  metaData AddPhoto curPhoto                            foreach  FileInfo file in Jpgs                            listBox1 Items Add file Name                   Photo curPhoto   new Photo                    curPhoto PhotoLocation   file FullName                  metaData AddPhoto curPhoto                           foreach  FileInfo file in Gifs                            listBox1 Items Add file Name                 Photo curPhoto   new Photo                  curPhoto PhotoLocation   file FullName                metaData AddPhoto curPhoto                         foreach  FileInfo file in Tiffs                            listBox1 Items Add file Name                 Photo curPhoto   new Photo                  curPhoto PhotoLocation   file FullName                metaData AddPhoto curPhoto                         foreach  FileInfo file in Bmps                            listBox1 Items Add file Name                 Photo curPhoto   new Photo                  curPhoto PhotoLocation   file FullName                metaData AddPhoto curPhoto

User · Answer

You can t do that  because GetFiles only accepts a single search pattern  Instead  you can call GetFiles with no pattern  and filter the results in code   string   extensions   new       jpg     tiff     bmp      FileInfo   files       dinfo GetFiles             Where f   gt  extensions Contains f Extension ToLower               ToArray      If you re working with  NET 4  you can use the EnumerateFiles method to avoid loading all FileInfo objects in memory at once   string   extensions   new       jpg     tiff     bmp      FileInfo   files       dinfo EnumerateFiles             Where f   gt  extensions Contains f Extension ToLower               ToArray

User · Answer

You can get every file  then filter the array   public static IEnumerable lt FileInfo  GetFilesByExtensions this DirectoryInfo dirInfo  params string   extensions        var allowedExtensions   new HashSet lt string  extensions  StringComparer OrdinalIgnoreCase        return dirInfo EnumerateFiles                      Where f    allowedExtensions Contains f Extension        This will be  marginally  faster than every other answer here  In  Net 3 5  replace EnumerateFiles with GetFiles  which is slower    And use it like this   var files   new DirectoryInfo      GetFilesByExtensions   jpg     mov     gif     mp4

User · Answer

The following retrieves the jpg  tiff and bmp files and gives you an IEnumerable lt FileInfo gt  over which you can iterate   var files   dinfo GetFiles    jpg        Concat dinfo GetFiles    tiff         Concat dinfo GetFiles    bmp       If you really need an array  simply stick  ToArray   at the end of this

User · Answer

You can use LINQ Union method   dir GetFiles    txt   Union dir GetFiles    jpg    ToArray

User · Answer

Why not create an extension method  That s more readable   public static IEnumerable lt FileInfo gt  GetFilesByExtensions this DirectoryInfo dir  params string   extensions        if  extensions    null            throw new ArgumentNullException  extensions        IEnumerable lt FileInfo gt  files   Enumerable Empty lt FileInfo gt         foreach string ext in extensions               files   files Concat dir GetFiles ext              return files      EDIT  a more efficient version   public static IEnumerable lt FileInfo gt  GetFilesByExtensions this DirectoryInfo dir  params string   extensions        if  extensions    null            throw new ArgumentNullException  extensions        IEnumerable lt FileInfo gt  files   dir EnumerateFiles        return files Where f   gt  extensions Contains f Extension        Usage   DirectoryInfo dInfo   new DirectoryInfo   c  MyDir    dInfo GetFilesByExtensions   jpg    exe    gif

User · Answer

I m not sure if that is possible  The MSDN GetFiles reference says a search pattern  not a list of search patterns   I might be inclined to fetch each list separately and  foreach  them into a final list

[c#] GetFiles with multiple extensions

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