Duplicate DIsplay of Root Node in System.Windows.Forms.TreeView control

Chris Fleetwood 1

Hello,

I'm hoping someone will be able to shed some light on this.

I'm encountering an issue in the TreeView control that is manifesting when I build an instance of a System.Windows.Forms.TreeView in MS Video Studio 2017.

Basically,, the first time it is built, everything looks as expected. However, when I rebuild it at a later time (e.g.. after an update), the root node display gets duplicated. Multiple updates result in the TreeView displaying increasing multiple root notes.

The nodes do cleared each time before the TreeView gets built and rebuilt ( e.g., MyTreeView.Nodes.Clear() ).

I was able to verify that the root nodes do not physically get duploiated. The number of nodes in the Package treeview (Nodes collection) remain the same (1) and when i click on the duplicated root nodes and fall into debug (via MyTreeView_AfterSelect event), I can tell from the tag ID/handle that it is in fact the same (single) root node. It's just being displayed twice in the visual aspect of the TreeView.

This tells me that there is a bug in the Treeview control itself. I have researched this issue online in the StackOverflow dev community (as well as in a few other places) and I have tried a number of suggestions/approaches to try to get around the problem. None have been successful.

Any suggestions/insights would, of course, be greatly appreciated. I am at a loss as to what to do next.

Regards,

Christopher H. Fleetwood
cfleetwood@smartstart.org

Viorel 117.4K Reputation points

2021-11-22T16:58:47.143+00:00

Maybe the code that adds the nodes has some issues?
Chris Fleetwood 1 Reputation point

2021-11-22T17:26:18.037+00:00

I don't think any more nodes are being added. The code works fine the first time it is executed. Moreover, no extra root nodes appear to be added as the code executes. The two "duplicate" root nodes have the same tag/handle. Wouldn't that mean they are actually the same "single" node? TreeView.Nodes.Clear() is being executed each time , before the treeview nodes are added. The same routines are executed each time to add the nodes.
Jiachen Li-MSFT 31,331 Reputation points Microsoft Vendor

2021-11-23T07:40:08.623+00:00

Hi @Chris Fleetwood ,

However, when I rebuild it at a later time (e.g.. after an update), the root node display gets duplicated. Multiple updates result in the TreeView displaying increasing multiple root notes.

Would you please provide more related code so that I can reproduce your problem.
Waiting for your update.
Viorel 117.4K Reputation points

2021-11-23T08:54:09.513+00:00

The same routines are executed each time to add the nodes.

Maybe the data, used by routines, are different.
Chris Fleetwood 1 Reputation point

2021-11-26T13:30:26.993+00:00

The code producing the TreeView exceeds the max allowed for this post. Is there another way I can submit the code?
Chris Fleetwood 1 Reputation point

2021-11-26T15:43:36.273+00:00

Here is a screenshot of what I am seeing:
Chris Fleetwood 1 Reputation point

2021-11-26T15:53:52.113+00:00

Here are the current breakpoint values for the Treeview on the AfterSelect event. They show that only (1) root node is defined, yet multiple nodes are displaying in the previous screenshot:
Jiachen Li-MSFT 31,331 Reputation points Microsoft Vendor

2021-11-29T06:51:42.127+00:00

Hi @Chris Fleetwood ,
You can submit your code by posting an answer.
Chris Fleetwood 1 Reputation point

2021-11-29T13:03:50.83+00:00

I can't submit the code via the post. As I said before, the code producing the TreeView exceeds the maximum number of characters allowed for this post.

Is there another way I can submit the code?
Dewayne Basnett 1,361 Reputation points

2021-11-29T17:33:07.783+00:00

You could upload the code to OneDrive or Google Drive and then share that.
Chris Fleetwood 1 Reputation point

2021-12-01T13:20:55.46+00:00

Here is the google drive link with the treeview code:

view
Chris Fleetwood 1 Reputation point

2021-12-01T16:23:11.533+00:00

Here is the Google Drive link with the treeview code:

view
Jiachen Li-MSFT 31,331 Reputation points Microsoft Vendor

2021-12-02T06:25:46.683+00:00

Hi @Chris Fleetwood ,
I have done some tests based on the code you provided.
But I am missing some information about variables such as lcCon, EChangeRequests, EChangeRequestsImages, etc.
Could you please upload your project to github and share it here.(Please confirm to delete all your private information before uploading)
Viorel 117.4K Reputation points

2021-12-02T08:59:21.783+00:00

Maybe you are not checking the form or control you are seeing. Perhaps there is a different hidden tree view control.

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Duplicate DIsplay of Root Node in System.Windows.Forms.TreeView control

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