How to select specific files in a folder?

Question

I’m making a Console Application in C# which, given an array of file names it returns the address of each and adds them to a Dotnetzip Zipfile.

Currently I code lies like this:

string[] nomes = { 
  "C:\\users\\fabio\\desktop\\pastateste\\teste1.txt",
  "C:\\users\\fabio\\desktop\\pastateste\\teste5.txt",
  "C:\\users\\fabio\\desktop\\pastateste\\teste6.txt",
  "C:\\users\\fabio\\desktop\\pastateste\\teste10.txt"};

            using(ZipFile zip = new ZipFile())
            {
                foreach (string item in nomes)
                {
                    if (File.Exists(item))
                        zip.AddFile(item, "arquivos"); 
                }
                zip.Save("C:\\users\\fabio\\desktop\\compactteste.zip");

The "pastateste" folder contains . txt files from 1 to 10 and I just select {1,5,6,10}, but passing the full address of each file in the names array.

How can I rummage through the "pastateste" folder, pick up the address of the test files{1,5,6,10} and store them in another array?

Answer 1

It’s quite simple. You can simply get all the files from "pastateste" and apply to the returned collection a filter using the Where linq.

In the example below is done the file filter using a regex that tries to find by the following pattern:

• the file name must contain the word "test";
• then you need to find number 1, 5, 6 or 10;
• then need to find the word ".txt"; and
• string needs to finish after this

const string caminhoBase = @"C:\Users\fabio\Desktop\pastateste";
var regexArquivo = new Regex("teste(1|5|6|10).txt$");
    
var arquivos = Directory.GetFiles(caminhoBase).Where(a => regexArquivo.IsMatch(a));