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Deleting multiple files with wildcard

Posted by: admin November 30, 2017 Leave a comment

Questions:

You know that in linux it’s easy but I can’t just understand how to do it in C# on Windows. I want to delete all files matching the wildcard f*.txt. How do I go about going that?

Answers:

You can use the DirectoryInfo.EnumerateFiles function:

var dir = new DirectoryInfo(directoryPath);

foreach (var file in dir.EnumerateFiles("f*.txt")) {
    file.Delete();
}

(Of course, you’ll probably want to add error handling.)

Questions:
Answers:

I know this has already been answered and with a good answer, but there is an alternative in .NET 4.0 and higher. Use Directory.EnumerateFiles(), thus:

foreach (string f in Directory.EnumerateFiles(myDirectory,"f*.txt"))
{
    File.Delete(f);
}

The disadvantage of DirectoryInfo.GetFiles() is that it returns a list of files – which 99.9% of the time is great. The disadvantage is if the folder contains tens of thousands of files (which is rare) then it becomes very slow and enumerating through the matching files is much faster.

Questions:
Answers:

You can use the Directory.GetFiles method with the wildcard overload. This will return all the filenames that match your pattern. You can then delete these files.