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Determining the Size of a Directory Without Using FileSystemObjec t

Using the following, you can determine the size of a file:

Dim fi As New IO.FileInfo(<Pa th to file>)
MsgBox(fi.Lengt h)

.... but what about the size of a directory? The IO.DirectoryInf o object
doesn't have a Length property.
In is there a way in VB.NET to determine the size of a directory without
having to resort to importing the Scripting DLL and using the
FileSystemObjec t? Thanks.
Nov 21 '05 #1
2 7903
Hi Phil,

Here is one way you can do it, but it's not a recursive directory size:

Private Function DirectorySize(B yVal sDir As String) As Long
Dim d As New IO.DirectoryInf o(sDir)
Dim fils As IO.FileInfo() = d.GetFiles()
Dim f As IO.FileInfo
Dim i As Integer
For Each f In fils
i += f.Length
Return i
End Function


' Directory to check for size
Dim strDir As String =
Environment.Get FolderPath(Envi ronment.Special Folder.Desktop)
' Variable to convert direct size into bytes
Dim intBytes As Int32 = DirectorySize(s trDir)
' Variable to convert direct size into kilobytes
Dim intKiloBytes As Int32 = (DirectorySize( strDir) \ 1024)
' Variable to convert direct size into megabytes
Dim intMegaBytes As Int32 = (DirectorySize( strDir) \ 1048576)
' Variable to convert direct size into gigabytes
Dim intGigaBytes As Int32 = (DirectorySize( strDir \ 1073741824))
' Show results in bytes
MessageBox.Show (String.Format( "The directory size is {0:d2} bytes",
' Show results in kilobytes
MessageBox.Show (String.Format( "The directory size is {0} KB",
' Show results in megabytes
MessageBox.Show (String.Format( "The directory size is {0} MB",
' Show results in gigabytes
MessageBox.Show (String.Format( "The directory size is {0} Gb",

I hope this helps
Nov 21 '05 #2
I decided to code you a recursive directory size function:

Public Shared Function GetDirectorySiz e(ByVal sPath As String) As Long
Dim lngSize As Long = 0
Dim diDir As New System.io.Direc toryInfo(sPath)
Dim fil As System.io.FileI nfo
For Each fil In diDir.GetFiles( )
lngSize += fil.Length
Next fil
' Recursively call the function
Dim subDirInfo As System.io.Direc toryInfo
For Each subDirInfo In diDir.GetDirect ories()
lngSize += GetDirectorySiz e(subDirInfo.Fu llName)
Next subDirInfo
Return lngSize
End Function


Dim strDir As String =
Environment.Get FolderPath(Envi ronment.Special Folder.Desktop)
MessageBox.Show (GetDirectorySi ze(strDir))

The above example will get the directory size of the Desktop including all
sub directories.

If you use the conversions from my other post, you can soon put the info
into bytes, kilobytes, megabytes & gigabytes

I hope this helps
Nov 21 '05 #3

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