Exact file extension match with GetFiles()?

Question

I\'d like to retrieve a list of files whose extensions match a specified string exactly.

DirectoryInfo di = new DirectoryInfo(someValidPath);
List

        

Answer 1

Somewhat of a workaround, but you can filter out exact matches with the Where extesion method:

foreach (FileInfo fi in di.GetFiles("*.txt")
    .Where(fi => string.Compare(".txt", fi.Extension, StringComparison.OrdinalIgnoreCase) == 0))
{
   myFiles.Add(fi);
}

Note that this will make a case insensitive matching of the extension.

Answer 2

Couldn't you just add an if and check the last four characters of the filename?

Answer 3

If you are using C# 2.0 Isn't easier ?

string fileExtensionFilter = "*.txt";
            DirectoryInfo di = new DirectoryInfo(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments));
            List<FileInfo> myFiles = new List<FileInfo>();
            foreach (FileInfo fi in di.GetFiles(fileExtensionFilter))
            {
                if (fi.Extension == fileExtensionFilter.Substring(1)) myFiles.Add(fi);
            }

Answer 4

DirectoryInfo di = new DirectoryInfo(someValidPath);
List<FileInfo> myFiles = new List<FileInfo>();
foreach (FileInfo fi in di.GetFiles("*.txt"))
{
   if (fi.Extension == ".txt")
      myFiles.Add(fi);
}

Answer 5

Regex might be overkill. Use the extension on FileInfo.

foreach (FileInfo fi in di.GetFiles("*.txt").Where(f => f.Extension == ".txt"))
{
     myFiles.Add(fi);
} 

Answer 6

Using the AddRange feature of lists instead of doing the foreach loop and calling Add for each item returned by the expression below (which I save into the variable list).

var list = di.GetFiles("*.txt").Where(f => f.Extension == ".txt");
myFiles.AddRange(list);

I'm presuming you were just showing us a snippet of your code and myFiles already had values in it, if not, you could do instead.

List<FileInfo> myFiles = di.GetFiles("*.txt").Where(f => f.Extension == ".txt").ToList();