FilesystemTree control in .NET

The control

FilesystemTree is a control which will read the system resources and display a tree from which a user can navigate to a file or a folder...

Programmers can use this control as part of their applications to allow users to navigate to a folderList or fileSystemTree structure, and get back the file/folder path that the user has selected.

The code

The code is self-explanatory. Briefly, it has a TreeView control linked to an ImageList control. The ImageList control is for the TreeView to pick its icons from. To view the images in the ImageList control, open properties of the ImageList control and click on the ellipsis (...) next to the images property.

Using system.management namespace in .NET, the TreeView is filled with the resources/drives available on the system and as the user expands a node, sub-nodes are populated in a more user-friendly way. The textbox above the TreeView control is populated with the user's selection of a file/folder. The textbox is disabled... its only for viewing. The user's selection can also be accessed by using filesystemtree1.pathselected (if filesystemtree1 is an instance of the control on an application).

Using the code

Add the control to the project. If you are using VS.NET, right click on the toolbox in VS.NET -> Customize -> browse to the control's DLL and select. This will get the control on the toolbox. Drag and drop the control on to your application. If the control's instance on your application is called FilesystemTree1, use the code below, to get the user's selection.

//get the user's selection.

FileSystemTree1.pathselected

//

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

Harish Palaniappan

Synechron Technologies, Pune

India

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Harish loves computers for their basic quality of running tasks given and doing things clockwork without day-dreaming like him.

Note: My employer does not subscribe to my thoughts posted in my articles.

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Upload MS Access Data on Network

Sanjay C H

3:08 19 Jun '06

Sir, We have attendance machine which Accepts Reader ID and Card No.s and related Employee data identified with Reader ID and Card No.These data gets uploaded in MS Access Database after click of button. Now I want this data should get automatically upload in SQL Database as and when Card swiping done by Employee. So please help me out. Sanjay H
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tree duplicates file/directory names

bc60

8:05 18 Apr '06

I put your object in one of my apps and ran the app and using your object, I navigated to a folder than contained sub-folders and files. After navigating to this folder, I selected some other folder outside of this original folder and then navigated back to the original folder. The sub-folders and files were listed twice. If I navigated away and back, they were added a third time. It seems that your object isn't deleting its subtrees after collapsing them.
-- modified at 14:07 Tuesday 18th April, 2006

XP Icons

öalkfjöaldkfjaödlfkj???

1:33 7 Feb '05

It's not very beautiful...
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VB .NET 1.1 - Out Of Memory Exception

branded2

4:35 18 Mar '04

Hello All,

I'm a student using version 1.1 of VB .NET.

I was trying to make a freeware image viewer similar to older, leaner versions of ACDSee.

I have a drive/folder navigation listbox on the left side. Whenever the user navigates into a directory that contains images a list box on the right side displays a thumbnail of each image.

I started with 36 images and everything worked fairly well, although I cannot scroll through the thumbnails yet. I added another 36 images and I get an out of memory exception when I navigate into my image directory. With 72 thumbnails??? I have 1 gig of ram and this just doesn't seem right, even if the full image sizes are stored into memory. I know I've open 1500+ thumbnails in ACVDSee, so I'm far short in creating a similar program.

It also takes 3-4 seconds to make this simple check for 4 image extensions and to create and display a thumbnail for each found.. limited to 40 or so images before the dynamic memory is exhausted. I thought XP handled memory in a far more efficient way that utilizes the ram better.

Here is the code that throws the exception on approximately the 40th thumbnail created:
(from Mastering Visual Basic .NET; Evangelos Petroutsos)

===========================================================================
Private Sub ThumbNails()

Dim file As String
Dim FI As FileInfo
Dim PBox As PictureBox
Dim img As Image
Dim Left As Integer = 10
Dim Right As Integer = 40
Dim ctrl As Integer
Dim Top As Integer = 10

'Remove All PictureBox controls on the form:
For ctrl = (lst2.Controls.Count - 1) To 0 Step -1
lst2.Controls.Remove(lst2.Controls(ctrl))
Next

For Each file In Directory.GetFiles(mstrCurrentPath)

FI = New FileInfo(file)

If FI.Extension = ".gif" Or FI.Extension = ".jpg" Or FI.Extension = ".bmp" Or _
FI.Extension = ".png" Then

Try
img = Image.FromFile(FI.FullName)
FN = FI.FullName
PBox = New PictureBox
PBox.Image = img.GetThumbnailImage(100, 100, Nothing, Nothing)
If Left > 500 Then
Left = 10
Top = Top + 110
End If

PBox.Left = Left
PBox.Top = Top
PBox.Width = 100
PBox.Height = 100

PBox.Visible = True
PBox.Tag = FI.FullName

AddHandler PBox.Click, New System.EventHandler (AddressOf OpenImage)
Left += 110
lst2.Items.Add(PBox)
Catch
lst1.Items.Add(FI.FullName).ToString()
End Try
End If

FI = Nothing 'Trying to free dynamic mem:
PBox = Nothing

Next
End Sub
===========================================================================

I appreciate any comments or suggestions that you might have to help me along in this learning project.

Re: VB .NET 1.1 - Out Of Memory Exception

Harish Palaniappan

5:05 24 Mar '04

Hi,

.NET doesnt release memory as soon as u do a obj=nothing.. .net's garbage collector takes its own time (sometimes immediate, sometimes after some processes).

to make sure u can try executing these lines of code (say every 50th or 100th picture box added)

GC.Collect()

GC.WaitForPendingFinalizers()

That would force garbage collector GC, to collect all released objects and release memory for the real. and the program would wait until its finished.

but this is going to eat up sometime on your applications processing speed ..

u shud find better oop means of generating thumbnails and adding to listview. to increase speed of ur application. and manage memory better. if there are 400 images.. creating and destroying picture objects is going to take its time and resources.

-Harish

FileSystemTree Control Additions

csnyder

13:34 3 Nov '03

I find that I need a little more functinality in the control

So, I addes a property and an event.

The property is "ShowFiles". If true, then the control will show the files, if false, no files are shown, just directories.

I also added an event to fire when the text box changes:

Public Event FileChanged(ByVal sender As Object, ByVal e As System.EventArgs)

Private Sub TextBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
RaiseEvent FileChanged(sender, e)
End Sub

So, now I can show the contents of the file when the user selects another file.

The one I want (and don't have yet) is the ability to set a starting directory "P:\Program Files\TrustPrint\Files" and have it already selected and the child nodes expanded.

Any help would be apperciated. Otherwise a great control, and I'm using it in several projects.

Download Error

AxelM

22:41 22 May '03

Hi, when I try to download the files I get an error. Axel
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Re: Download Error

Harish Palaniappan

0:14 23 May '03

) sorry about that.. corrected it.. -Harish
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Re: Download Error

AxelM

0:26 23 May '03

Thanks Axel
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Re: Download Error

Anonymous

6:46 28 May '03

It is giving me error after I browsed it, when I click OK. "Does not recognize as a COM object" Thanks, J Gustavo
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Re: Download Error

Anonymous

6:50 28 May '03

I am sorry. My mistake. This is not a COM object (!). It's in the .NET Framework Components now. Thank you. Regards, J Gustavo
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