Author: Nosa Lee
Original Address: https://www.seeksunslowly.com/dot-net-get-folder-size
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The .NET built-in assemblies (I use .NET 3.5) do not provide a way to get the folder/directory size directly.
If use the preset .NET assemblies to get it, you need to traverse all files under a folder and its sub folders, it is inefficient and cumbersome.

If you have worked in VB6 programming previously, you should know each version of Windows has a COM – Windows Script Host Object Model (wshom.ocx), the Folder object of this component can get folder size directly.

Now I provide a example in VB 2008 to explain how to do (get folder size):

1. Create a new Windows Form Application and open its properties page, choose References, click Add… -> Reference… drop-down button like this:

2. Choose Windows Script Host Object Model in the COM tab page on the popup window and click <OK> like below:

3. At this time, the references list will add a new item: Windows Script Host Object Model, please select this reference and press <F4>, double-click Path property, copy the full path of this wrapper assembly, like this:

4. Usually, we do not operate COM directly, so please delete this COM reference (click <Remove> button). We will use the related wrapper .NET assembly, click Add… -> Reference… drop-down button again, paste above full path of this wrapper assembly to [File name] field on the Browse tab page, and then click <OK>, like below:

5. Good, at this time you can already use the wrapper assembly – Interop.IWshRuntimeLibrary to get folder size directly, the code as below:
[cc lang=”vbnet”]
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim f As IWshRuntimeLibrary.Folder
f = New IWshRuntimeLibrary.FileSystemObject().GetFolder(“h:\test”)
MsgBox(f.Path & ” ” & f.Size & ” Bytes”) ‘ Please note the unit is Bytes, you may need to do conversion according to your requirement.
End Sub
End Class
[/cc]

6. Run this project, you will see the effect like below:

Note: this way is not only appropriate for .NET, you can also apply it to other Windows programming languages that do not provide the folder size query interface, please refer to this article to to your works.

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