删除数百万个文件的最快方法

Question

I have a list of string which are relative paths. I also have a string which contains root path for those files. Now I am deleting them like this:

foreach (var rawDocumentPath in documents.Select(x => x.RawDocumentPath))
{
    if (string.IsNullOrEmpty(rawDocumentPath))
    {
        continue;
    }
    string fileName = Path.Combine(storagePath, rawDocumentPath);
    File.Delete(fileName);
}

the problem is that I call Path.Combine for every file, and it's slow enough. How can I speed up this code? I can't delete whole folders, I cannot change current directory (because it affects a whole program)...

I need something like a class which can delete fast several files in specified directory.

Answer 1

If your disk can handle it, parallizing should help a lot:

documents.AsParallel().ForAll(
    document =>
    {
        if (!string.IsNullOrEmpty(document.RawDocumentPath))
        {
            string fileName = Path.Combine(storagePath, document.RawDocumentPath);
            File.Delete(fileName);
        }
    });