CODEWITHSUNDEEP
c#asp.net
Vigna Hari Karthik
Vigna Hari Karthik

Reputation: 109

Enumerate Files

I want to get the files where the file names contains 14 digits.

enter image description here

  foreach (var file_path in Directory.EnumerateFiles(@"F:\apinvoice", "*.pdf"))
  {

  }

I need to get the files only which has "14" digits.

16032021133026
17032021120457
17032021120534

Upvotes: 1

Views: 520

Answers (3)

sommmen
sommmen

Reputation: 7648

Since these seem to be timestamps, another thing you could do is this;

foreach (var file_path in Directory.EnumerateFiles(@"F:\apinvoice", "*.pdf"))
{
    DateTime dateTimeParsed;
    var dateTimeParsedSuccesfully = DateTime.TryParseExact(file_path, "ddMMyyyyHHmmss", CultureInfo.InvariantCulture, DateTimeStyles.None, out dateTimeParsed);
    
    if(dateTimeParsedSuccesfully)
    {
        // Got a valid file, add it to a list or something.
    }
}

Also see: https://learn.microsoft.com/en-us/dotnet/api/system.datetime.tryparseexact?view=net-5.0 https://learn.microsoft.com/en-us/dotnet/api/system.datetime.parseexact?view=net-5.0

ofcourse often the timespan will often be at the end of a file, so if there are characters or something in front, you may want to pass file_path.Substring(file_path.length - 14) to TryParseExact().

Upvotes: 0

Pribina
Pribina

Reputation: 780

I would go with regex where you specify pattern

you said you want 14 digits meaning it will ignore names like

 a1603202113302

because it contains letter

therefore pattern is

^[0-9]{14}$

and full code:

 Regex rx = new Regex("^[0-9]{14}$");
            
 Directory
     .EnumerateFiles(@"F:\apinvoice", "*.pdf")
     .Where(x => rx.IsMatch(Path.GetFileNameWithoutExtension(x)));

Upvotes: 1

HugoHiasl
HugoHiasl

Reputation: 324

Assign it to a list

List<string> list = Directory.EnumerateFiles(@"F:\apinvoice", "*.pdf"))
List<string> whatyouwant = list.Where(l => l.Length == 14).ToList();

Upvotes: 0

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