FolderTreeView Control

• Download source code - 12.0 Kb
• Download the demo - 24.5 Kb

Introduction

This is an all-new version of the FolderTreeView control I posted here at CodeProject some weeks ago. The control now starts in the Desktop namespace, and a new drilling method has been added so the startup folder can be specified. Please note that this control is not intended to have all of the functionality of the actual Windows Explorer TreeView - it is a light-weight control designed for use in projects where you want to supply a treeview for folder navigation, without supporting windows shell extensions. If you are looking for a control that supports shell extensions you should be looking at the excellent �xplorerTreeControl submitted by Carlos H Perez here at the CodeProject website.

How it works

After calling the InitFolderTreeView() method, a dummy Desktop not is created as the root node, and then the shell's Desktop namespace is iterated to populate the first level nodes. The child nodes are then iterated, checking only for the presence of sub-child nodes. If sub-child nodes are found, a dummy node is inserted so that the [+] will be displayed for folders that can be expanded. When the BeforeExpand event fires, the folder being expanded is checked for a dummy node. If a dummy is present, it is removed and the node's children are re-populated. If the node's children have already been populated no further action occurs.

Usage

The FolderTreeView control is based on 3 classes:

• FolderTreeView - The FolderTreeView implementation
• ShellOperations - Supporting Shell Operations
• ExtractIcons - Shell Icon Extractor

The control naturally derives from the System.Windows.Forms.TreeView, exposing 1 new property, GetSelectedNodePath() which returns the currently selected node's full path. There are 2 new methods: InitFolderTreeView() must be called to populate the TreeView - normally you would call this in your Form's OnLoad event. The 2nd method is DrillToFolder(string folderPath) - this will recurse through the tree looking for the specified folder path, returning a boolean to indicate if the search was sucessful or not.

The method used to retreive the icon for the Desktop root node works fine, but is perhaps not the best way to go about it. This control has NOT been tested in Win9x, NT or 2000 - feedback on these OS's would be much appreciated. Of course if you improve this control I would appreciate the update, and if you have any feedback to offer, please post it below.

Updates

Version 1.11:

• Updated the GetDesktopIcon() method so it returns the shell's small desktop icon rather than the large version
• Added code so that the Desktop node would return the full desktop folder path

I have now tested the code on Windows Me without problem - feeback on how it works with other OS's would be appreciated!

You must Sign In to use this message board.

FAQ    Noise Tolerance Very HighHighMediumLowVery Low   Layout Expand Posts & RepliesThread ViewNo JavascriptNo JS + Preview   Per page 102550

Msgs 1 to 25 of 105 (Total in Forum: 105) (Refresh) FirstPrevNext

Not able to see Entire Network in My Network Places remane 3:34 24 May '07   Not able to see Entire Network in My Network Places :-> also the same authentication issues when trying to access my network places remane rushikesh Sign In·View Thread·PermaLink 1.00/5 (1 vote) Compiling on Vista, executing on XP - error splattne2 4:55 15 Mar '07   The control works fine, if I compile in VS2005 (SP1) on Windows XP and use the resulting .exe in XP. If I compile on VS 2005 (SP1 + Vista patch) on Windows Vista, then deploy to a Windows XP machine, I get the following error loading the control: It's in German, the text in English would be: "The COM-Object "Shell32.ShellClass" cannot be transformed in the interface type "Shell32.IShellDispatch5" ..." ----snipp---- System.InvalidCastException: Das COM-Objekt des Typs "Shell32.ShellClass" kann nicht in den Schnittstellentyp "Shell32.IShellDispatch5" umgewandelt werden. Dieser Vorgang konnte nicht durchgeführt werden, da der QueryInterface-Aufruf an die COM-Komponente für die Schnittstelle mit der IID "{866738B9-6CF2-4DE8-8767-F794EBE74F4E}" aufgrund des folgenden Fehlers nicht durchgeführt werden konnte: Schnittstelle nicht unterstützt (Ausnahme von HRESULT: 0x80004002 (E_NOINTERFACE)). bei Shell32.ShellClass.NameSpace(Object vDir) bei Furty.Windows.Forms.ShellOperations.AddRootNode(TreeView tree, Int32& imageCount, ImageList imageList, ShellFolder shellFolder, Boolean getIcons) bei Furty.Windows.Forms.ShellOperations.PopulateTree(TreeView tree, ImageList imageList) bei Furty.Windows.Forms.FolderTreeView.InitFolderTreeView() ----snipp---- I even tried to reference the original XP shell32.dll. Doing so, I get this error: System.Runtime.InteropServices.COMException (0x8007007F): Die COM-Klassenfactory für die Komponente mit CLSID {13709620-C279-11CE-A49E-444553540000} konnte aufgrund des folgenden Fehlers nicht abgerufen werden: 8007007f. bei Furty.Windows.Forms.ShellOperations.AddRootNode(TreeView tree, Int32& imageCount, ImageList imageList, ShellFolder shellFolder, Boolean getIcons) bei Furty.Windows.Forms.ShellOperations.PopulateTree(TreeView tree, ImageList imageList) bei Furty.Windows.Forms.FolderTreeView.InitFolderTreeView() Sign In·View Thread·PermaLink 1.00/5 (1 vote) Re: Compiling on Vista, executing on XP - error Dynamite Jones 6:37 27 Jul '07   I have the same issue, did you ever resolve this? Sign In·View Thread·PermaLink 1.00/5 (1 vote) Why are you Developing on Vista!? redfish34 15:05 11 Oct '07   You folks are nutty in the head for developing on Vista. Sign In·View Thread·PermaLink 3.67/5 (2 votes) Re: Why are you Developing on Vista!? datacore 22:22 29 Oct '08   maybe it's a part of the future? u ignorant! Sign In·View Thread·PermaLink 1.00/5 (1 vote) How to remove the A: drive(diskette) from the tree? rytek90 5:47 9 Feb '07   Hi all! How to make a not show the A: drive in tree? Sorry for my english Thanks! Sign In·View Thread·PermaLink 1.00/5 (2 votes) Connection to Live ID? Seikilos 10:57 11 Jan '07   Hello, i am confused, everytime i use this control and click on the network folder icon on root, the programm tries to connect to the internet, the host is stopped by zonealarm, but why want it connect to it? Once i let it connect and it presented me a logon for MS Live ID. When i deny the connection, i get a "Windows live id connection error" message. "Your request cant be send because the windows live id service is unavailable" where i can retry or abort, both leads me back to the message and my programms is trapped in that loop. Has somebody an explanation for me? Sign In·View Thread·PermaLink Re: Connection to Live ID? Seikilos 8:44 15 Jan '07   Well a small addendum to it, i found some weird behaviour, because my notebook has one of those "my website on msn" links in my neighbourhood. When i click on the network, the private static void CheckForSubDirs(..); iterates here foreach(Shell32.FolderItem item in folder.Items()) and folder does only contain the link to msn but unfortunately the programm tries to connect to it because of folder.Items(); this seems to be an unpleasant behaviour. Of course i can delete this link, and i will, but it looks like url shortcuts are processed through a connection Sign In·View Thread·PermaLink Hourglass Cursor in ExpandBranch goondoo27 13:20 17 Nov '06   It looks like the majority of the processing time is done in ExpandBranch(). Is there anyway to change the cursor to an hourglass while this routine is processing? Thanks. Great code. John Sign In·View Thread·PermaLink Re: Hourglass Cursor in ExpandBranch goondoo27 7:08 20 Nov '06   Ok I've found out how to do this, modify the ExpandBranch() routine as follows: public static void ExpandBranch(TreeNode tn, ImageList imageList) { // if there's a dummy node present, clear it and replace with actual contents if(tn.Nodes.Count == 1 && tn.Nodes[0].Tag.ToString() == "DUMMYNODE") { Cursor.Current = Cursors.WaitCursor; System.Windows.Forms.Application.DoEvents(); tn.Nodes.Clear(); Shell32.FolderItem folderItem = (Shell32.FolderItem)tn.Tag; Shell32.Folder folder = (Shell32.Folder)folderItem.GetFolder; int imageCount = imageList.Images.Count - 1; foreach(Shell32.FolderItem item in folder.Items()) { if(item.IsFileSystem && item.IsFolder && !item.IsBrowsable) { TreeNode ntn = AddTreeNode(item, ref imageCount, imageList, true); tn.Nodes.Add(ntn); CheckForSubDirs(ntn, imageList); } } Cursor.Current = Cursors.Default; } } That's it. Remember that you must use Cursor.Current not tn.TreeView.UseWaitCursor. I hope this helps, John Sign In·View Thread·PermaLink How To Remove Network Neighbourhood, Internet Explorer and Recyle Bin ? scorpion_pgm82 3:22 30 Aug '06   Thanks for this great Tree Control, it really made my work easier. However, I do not need the following nodes: 1)Network Neighbourhood or any recently accessed shared folder from any other system 2) Internet Explorer and 3) Recycle Bin To be displayed on the tree control? Any help with this matter would be greatly appreciated. Thanks once again. Sign In·View Thread·PermaLink 2.00/5 (1 vote) List All Computers in the network Shailesh Halankar 0:35 29 May '06   Your FolderTreeView Control is great to start with for CSharp Beginners. Could you tell me when the Network Places node is clicked, the tree should display all computers in the network. ie Network Places -> Entire Network ->Microsoft Windows Network ->Domain1 ->Computer1 ->Computer2 ->Directory Right now it shows all the recently accessed shared folders on different machines. Any Help would be appreciated Thanks Sign In·View Thread·PermaLink Re: List All Computers in the network datacore 21:58 22 Jun '06   I need the same functionality. I changed some things to get also all files in the TreeView but also then I can't finde the "Entire Network" directory! It would be great if someone got's an idea... PS: THX 4 this realyKickAssNice Appl. Sign In·View Thread·PermaLink 1.00/5 (1 vote) Problem with icons colors Galanty 0:43 23 Mar '06   When running your exe everything is ok, but after compiling in Visual Studio 2005, instead of shadows under the icons I’ve black blot. How to correct this? Sign In·View Thread·PermaLink Re: Problem with icons colors sir_mad 1:15 23 Mar '06   Galanty wrote: When running your exe everything is ok, but after compiling in Visual Studio 2005, instead of shadows under the icons I’ve black blot. How to correct this? no it's not. browse this comments, there is a solution for that somewhere. basically this issue has something to do with visual styles. penny Sign In·View Thread·PermaLink 2.00/5 (4 votes) Re: Problem with icons colors Galanty 9:21 24 Mar '06   Ok, thx, I've missed them. Sign In·View Thread·PermaLink 1.00/5 (1 vote) DrillToFolder and unc-path tabor25 6:29 2 Mar '06   Hello, the control is really great. By testing it i saw that the DrillToFolder-function does not support unc-paths (for example \\neo\public\Test\). I wanted to fix this, but till now i have no clue how to do this. Best regards Tabor25 Sign In·View Thread·PermaLink 1.33/5 (3 votes) Pay attention to shell extensions Liviu 5:10 7 Feb '06   Thanks for the great code ! I have encountered a strange behaviour. The application (the original demo as well as my app where I want to include a folder tree) does not end. The process just remains in memory after the main form is closed. After some debugging, I found out that the reason was "Sony Ericsson File Manager", which I have installed for managing the mobile phone. This installs a shell extension, which is displayed as system folder under "Desktop". Knowing this, I changed the code to keep only MyComputer and NetworkNeighborhood system folders and "normal" folders under "Desktop", this is what I need anyway. I just wanted to let you know that some not-so-well-written shell extensions may cause strange issues in apps using this code. Sign In·View Thread·PermaLink Re: Pay attention to shell extensions sir_mad 5:53 22 Mar '06   hi Liviu, i've encountered the same problem, can you post your modified code here? it'll save me some time thanks in advance penny Sign In·View Thread·PermaLink What about the hidden directory ? bilb0t 4:22 1 Feb '06   Hello, I just need to have the hidden directory displayed. How can I Do This ? Thx Sign In·View Thread·PermaLink Excellent -Dy 11:25 24 Jan '06   Fantastic work, just what I was looking for and a lot for me to look through and learn from. Thank you. - Dy Sign In·View Thread·PermaLink Performance and network neighbourhood rubberring 11:32 8 Nov '05   i have some performance troubles using this wonderful control. when i open the "my computer" node the system lags for 5 seconds. opening "network neighbourhood" causes a microsoft passport network login after one minute... Sign In·View Thread·PermaLink Re: Performance and network neighbourhood dario77 8:06 11 Jan '06   I have the same problem: opening my network neighbourhood is slow and asks a microsoft passport network login. Any hints? Sign In·View Thread·PermaLink 5.00/5 (1 vote) Control in Designer with DLL Compilation akiriwas 18:13 8 Oct '05   Furty, I've just started doing a lot of C# .NET development and I noticed something in this project after downloading that was quite intriguing to me. You create a custom control called FolderTreeView which inherits from System.Windows.Forms.TreeView. This is great and so far nothing is a mystery. What IS a mystery to me, is that although you haven't created a seperate project and compiled this new control into a DLL, you somehow added it to the TestForm in Design view, yet I don't see how since it is not in the toolbox and there is no seperately compiled DLL for the FolderTreeView which I can add a reference to. How did you add your new control to the form visually? Thanks alot and keep up the great work. Sign In·View Thread·PermaLink 2.00/5 (2 votes) Re: Control in Designer with DLL Compilation Gav_Roberts2k5 4:03 18 Oct '05   It's easy to compile into a dll... Open a new Windows Control Library, and name it. Then right click on the solution in your solution window, and click add existing file. Find the folder that contains this example and grab the file: FolderTreeView.cs Then right click on your references area, and click add reference. Click browse and goto the folder that contained the FolderTreeView.cs, and go into the BIN/debug and add the Interop.Shell32.dll Compile, and grab both the Interop.Shell32.dll and *.dll file ( name of the project you called it ) and as normal add it to your tool box by right clicking on it, and add/remove. I haven't tested it yet, but it looks good. Gav -- modified at 9:23 Tuesday 18th October, 2005 Edit: "Well I've tested it and it works a dream, to populate the TreeView just add the following this.folderTreeView1*.InitFolderTreeView(); * rename to the name of your custom treeview. Sign In·View Thread·PermaLink 5.00/5 (1 vote)

Last Visit: 20:17 8 Nov '09     Last Update: 20:17 8 Nov '09 12345 Next »