Get folder used space on a NAS C#

Question

Is there a way using C# to get a folder size (used space on drive) located on a NAS or on a network shared directory I.e.: \\myNASdrive\MediaFiles?

I already tried something like this:

string[] a = Directory.GetFiles(p, "*.*");
long b = 0;
foreach (string name in a)
{       
    FileInfo info = new FileInfo(name);
    b += info.Length;
}   
return b;

But this works for local folders only.

Also we've tried using user impersonation but with no results.

Answer 1

Assuming you have the right permissions, this should do it;

using System;
using System.Runtime.InteropServices;

namespace DiskFreeSpaceEx
{
    internal class FreeSpace
    {
        [DllImport("kernel32")]
        public static extern int GetDiskFreeSpaceEx(string lpDirectoryName,ref long    lpFreeBytesAvailable,ref long lpTotalNumberOfBytes,ref long lpTotalNumberOfFreeBytes);
        const string RootPathName = @"\\server\share";
        private static void Main(string[] args)
        {
            long freeBytesAvailable = 0;
            long totalNumberOfBytes = 0;
            long totalNumberOfFreeBytes = 0;

            GetDiskFreeSpaceEx(RootPathName, ref freeBytesAvailable, ref
               totalNumberOfBytes, ref totalNumberOfFreeBytes);

            Console.WriteLine("{0}\t{1}\t{2}\t{3}", RootPathName,
                freeBytesAvailable, totalNumberOfBytes, totalNumberOfFreeBytes);
        }
    }
}

Uses P/Invoke to get the information. Make sure you change the server and share.