Question

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How do I get a directory size (files in the directory) in C#?

In vbscript, it’s incredibly simple to get the folder size in GB or MB:

Set oFSO = CreateObject("Scripting.FileSystemObject")
Dim fSize = CInt((oFSO.GetFolder(path).Size / 1024) / 1024)
WScript.Echo fSize

In C#, with all my searches, all I can come up with are long, convoluted, recursive searches for every file size in all subfolders, then add them all up at the end.

Is there no other way?

Answer 1

How about this:

private static long GetDirectorySize(string folderPath)
{
    DirectoryInfo di = new DirectoryInfo(folderPath);
    return di.EnumerateFiles("*", SearchOption.AllDirectories).Sum(fi => fi.Length);
}

from here.

This will give you the size in bytes; you will have to “prettify” that into GBs or MBs.

NOTE: This only works in .NET 4+.

EDIT: Changed the wildcard search from "*.*" to "*" as per the comments in the thread to which I linked. This should extend its usability to other OSes (if using Mono, for example).