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How to take first file name from a folder in C#

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c#

I need to get the first file name from a folder. How can I get this in C#?

The code below returns all the file names:

DirectoryInfo di = new DirectoryInfo(imgfolderPath);
foreach (FileInfo fi in di.GetFiles())
{
    if (fi.Name != "." && fi.Name != ".." && fi.Name != "Thumbs.db")
    {
        string fileName = fi.Name;
        string fullFileName = fileName.Substring(0, fileName.Length - 4);

         MessageBox.Show(fullFileName);
    }
}

I need the first file name.

like image 467
riad Avatar asked May 26 '10 11:05

riad


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4 Answers

There's a few ways you could do this:

  • You could add a break statement after handling the first file. This will exit the foreach loop.

  • DirectoryInfo.GetFiles returns an array so you can assign it to a variable and scan through the elements until you find a suitable element.

  • Or if you are using .NET 3.5 you could look at the FirstOrDefault method with a predicate.

Here's some code:

string firstFileName =
    di.GetFiles()
      .Select(fi => fi.Name)
      .FirstOrDefault(name => name != "Thumbs.db");
like image 122
Mark Byers Avatar answered Sep 22 '22 07:09

Mark Byers


If you are using .Net 4.0 you should do this instead...

var firstFileName = di.EnumerateFiles()
                      .Select(f => f.Name)
                      .FirstOrDefault();

... .GetFiles() creates an array and as such must scan all files. .EnumerateFiles() will return an IEnumerable<FileInfo> so it doesn't have to do as much work. You probably won't notice mush of a difference on a local hard drive with a small number of files. But a network share, thumb drive/memory card, or huge number of files would make this obvious.

like image 44
Matthew Whited Avatar answered Sep 18 '22 07:09

Matthew Whited


FileInfo fi = di.GetFiles()[0];

Notes:

  • The code throws an exception if there are no files.
  • "First" is ambiguous — do you mean any file, or the first one alphabetically? In the latter case, you may need to worry about stuff like case-sensitivity and locale-dependent sorting.
like image 33
tc. Avatar answered Sep 22 '22 07:09

tc.


In reply to riad's comment to me:

In addition to abatischchev's solution:

var file = Directory.GetFiles(@"C:\TestFolder", "*.*")
            .FirstOrDefault(f => f != @"C:\TestFolder\Text1.txt");

I would add this to get the name only:

Console.WriteLine(file.Substring(file.LastIndexOf('\\')  + 1));

Which generates the output Text2.txt (I have three text tiles in that folder called Text1.txt, Text2.txt and text3.txt.

like image 26
Henric Avatar answered Sep 21 '22 07:09

Henric