Get count of files from directory without enumerating files in c#

Question

I am using Directory.EnumerateFiles() and Directory.GetFiles() to get the count of files in a specific directory in c#. The problem is that theses methods are slow because they enumerate files to get there count.

How to get the count of files in Directory without enumerating files in c#?

Answer 1

You have to enumerate through the folder in order to get all the files.

However, you can still do something to improve the performance. I suggest you have a look at those benchmark tests (Get1 method):

https://stackoverflow.com/a/17756559/3876750

It seems like the following method provides the best performance, according to the benchmark test:

private static int Get1(string myBaseDirectory)
{
    DirectoryInfo dirInfo = new DirectoryInfo(myBaseDirectory);
    return dirInfo.EnumerateDirectories()
           .AsParallel()
           .SelectMany(di => di.EnumerateFiles("*.*", SearchOption.AllDirectories))
           .Count();
}