Quelle est la meilleure façon de calculer la taille d'un répertoire dans VB .NET?

Faire le travail en parallèle devrait le rendre plus rapide, du moins sur des machines multi-noyau. Essayez ce code C #. Vous devrez traduire pour vb.net.

private static long DirSize(string sourceDir, bool recurse) 
{ 
    long size = 0; 
    string[] fileEntries = Directory.GetFiles(sourceDir); 

    foreach (string fileName in fileEntries) 
    { 
        Interlocked.Add(ref size, (new FileInfo(fileName)).Length); 
    } 

    if (recurse) 
    { 
        string[] subdirEntries = Directory.GetDirectories(sourceDir); 

        Parallel.For<long>(0, subdirEntries.Length, () => 0, (i, loop, subtotal) => 
        { 
            if ((File.GetAttributes(subdirEntries[i]) & FileAttributes.ReparsePoint) != FileAttributes.ReparsePoint) 
            { 
                subtotal += DirSize(subdirEntries[i], true); 
                return subtotal; 
            } 
            return 0; 
        }, 
            (x) => Interlocked.Add(ref size, x) 
        ); 
    } 
    return size; 
} 

Ceci est un extrait de code court et sucré qui obtiendra le travail. Il vous suffit de réinitialiser le compteur avant d'appeler la fonction

Public Class Form1
Dim TotalSize As Long = 0
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
    TotalSize = 0 'Reset the counter
    Dim TheSize As Long = GetDirSize("C:\Test")
    MsgBox(FormatNumber(TheSize, 0) & " Bytes" & vbCr & _
           FormatNumber(TheSize / 1024, 1) & " Kilobytes" & vbCr & _
           FormatNumber(TheSize / 1024 / 1024, 1) & " Megabytes" & vbCr & _
           FormatNumber(TheSize / 1024 / 1024 / 1024, 1) & " Gigabytes")
End Sub
Public Function GetDirSize(RootFolder As String) As Long
    Dim FolderInfo = New IO.DirectoryInfo(RootFolder)
    For Each File In FolderInfo.GetFiles : TotalSize += File.Length
    Next
    For Each SubFolderInfo In FolderInfo.GetDirectories : GetDirSize(SubFolderInfo.FullName)
    Next
    Return TotalSize
End Function
End Class

Code VB basé sur la réponse de Jamie:

Imports System.Threading
Imports System.IO

Public Function GetDirectorySize(ByVal path As String, Optional recurse As Boolean = False) As Long
    Dim totalSize As Long = 0
    Dim files() As String = Directory.GetFiles(path)
    Parallel.For(0, files.Length,
                   Sub(index As Integer)
                     Dim fi As New FileInfo(files(index))
                     Dim size As Long = fi.Length
                     Interlocked.Add(totalSize, size)
                   End Sub)

    If recurse Then
        Dim subDirs() As String = Directory.GetDirectories(path)
        Dim subTotal As Long = 0
        Parallel.For(0, subDirs.Length,
                       Function(index As Integer)
                         If (File.GetAttributes(subDirs(index)) And FileAttributes.ReparsePoint) <> FileAttributes.ReparsePoint Then
                           Interlocked.Add(subTotal, GetDirectorySize(subDirs(index), True))
                           Return subTotal
                         End If
                         Return 0
                       End Function)
      Interlocked.Add(totalSize, subTotal)
    End If

    Return totalSize
End Function