Directory GetFiles of certain extension

Question

Is there a way to simplify this linq expression  or is there a better way of doing this   Directory GetFiles dir         SearchOption AllDirectories            Where s   gt  s EndsWith   jpg   StringComparison OrdinalIgnoreCase                          s EndsWith   gif   StringComparison OrdinalIgnoreCase                          s EndsWith   png   StringComparison OrdinalIgnoreCase                                  Basically I want to return all files of a certain extension  Unfortunately  this method isn t very flexible  I d rather be able to add extensions to a list and have Directory GetFiles return those extensions  Is that possible

User · Answer

I would have done using just single line like  List lt string gt  imageFiles   Directory GetFiles dir         SearchOption AllDirectories         Where file   gt  new string       jpg     gif     png           Contains Path GetExtension file           ToList

User · Answer

Doesn t the Directory GetFiles String  String  overload already do that  You would just do Directory GetFiles dir     jpg   SearchOption AllDirectories   If you want to put them in a list  then just replace the    jpg  with a variable that iterates over a list and aggregate the results into an overall result set  Much clearer than individually specifying them      Something like     foreach String fileExtension in extensionList       foreach String file in Directory GetFiles dir  fileExtension  SearchOption AllDirectories            allFiles Add file              If your directories are large  using EnumerateFiles instead of GetFiles can potentially be more efficient

User · Answer

If you would like to do your filtering in LINQ  you can do it like this  var ext   new List lt string gt     quot jpg quot    quot gif quot    quot png quot     var myFiles   Directory      EnumerateFiles dir   quot     quot   SearchOption AllDirectories       Where s   gt  ext Contains Path GetExtension s  TrimStart  quot   quot   ToLowerInvariant       Now ext contains a list of allowed extensions  you can add or remove items from it as necessary for flexible filtering

[c#] Directory.GetFiles of certain extension

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