CODEWITHSUNDEEP
c#arraysstringfile
warcode360
warcode360

Reputation: 47

C# - Visiting only specific files in a directory

I use this function to traverse all files in a directory and executing a code for each file only if it has a specific extension, like .txt in the example. I also exclude the ones ending with .png.

foreach (string file in Directory.EnumerateFiles(rootDir).Where(
                f => (f.ToLower().EndsWith(".txt")) //Include
                     && !(f.ToLower().EndsWith(".png")) //Exclude
                        ).ToList())
                {
                //Do something
                }

This code works fine, but what if I have to deal with several extensions?

I would whitelisting/blacklisting every extension writing the same line of code over and over again.

I'm sure a clever way exists. An idea is to store all the wanted and unwanted extension in an array.

How the code above could be improve in order to do this?

Upvotes: 0

Views: 339

Answers (1)

Carra
Carra

Reputation: 17964

You can do something like this:

var whiteList = new List<string>{".txt"};
var blackList = new List<string>{".png"};

foreach (string file in 
            Directory
            .EnumerateFiles(rootDir)
            .Where(
                f => whiteList.Any(ext => (f.ToLower().EndsWith(ext))  //Either use a white list
                //f => !(blackList.Any(ext => (f.ToLower().EndsWith(ext))) //Or use a black list
            ).ToList())

Upvotes: 2

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