Question

How do I know the number of folders inside a directory?

I try using System.IO.Directory but no luck.

Answer 1

You’ve got a couple of options:

int directoryCount = System.IO.Directory.GetDirectories(@"c:\yourpath\").Length

or

var directoryInfo = new System.IO.DirectoryInfo(@"c:\yourpath\");
int directoryCount = directoryInfo.GetDirectories().Length;

If you need to do other things with them, and you’re using .NET 4, you can use the DirectoryInfo.EnumerateDirectories() function for performance reasons as well.

So yeah, lots of options. If you’re still having problems, you might want to let us know what didn’t work when using System.IO.Directory.