In VS2022, VB hot reload never works, claiming ENC0005, when Handles is not relevant

Question

In VS2022, VB hot reload never works, claiming ENC0005, when Handles is not relevant

peter rumsey 20

In this code, deleting either LstLog line text while at the breakpoint evinces the problem. You can use Debug. instead of LstLog.

    Private Sub mnuLogShown_Click(sender As Object, e As EventArgs) Handles mnuLogShown.Click
        LstLog.Write($"--------> File Pair List started at {Now}")
        LstLog.Write($"{fPair.LName}|#{xPair}|{fPair.RName}")
        For Each i In fPair.Map
            Dim item = cFiles(i).lvItem
            If Not item.fPair.Op.Any(Op.Ops) Then Continue For
            'LstLog.Write()
            Debug.WriteLine($"{item.LText} {item.Ops} {item.RText}")
        Next i '<--breakpoint>
    End Sub

Tianyu Sun-MSFT 34,456 Reputation points Microsoft External Staff

2025-03-07T09:39:17.56+00:00

Hi @peter rumsey ,

Thank you for sharing us the code sample. I tested like following but failed to reproduce this issue.

Would you mind sharing us the complete code sample to test further?

Besides, which version of VS 2022 are you using? Are you using the latest version(currently 17.13.2)? If you are using a previous version of VS 2022, would you mind trying to update it to the latest one?

Looking forward to hearing from you.
peter rumsey 20 Reputation points

2025-03-08T21:32:53.75+00:00

Upon further testing, it would appear that issue might be that hot reload doesn't work ANYWHERE in a method with a Handles clause targeting VB.Net Framework-4.8. A tedious workaround is to replace Handles clauses with AddHandler statements in an OnLoad override. Unfortunately, that breaks the one-click generation of the Handles-clause event handler, making that process more tedious.

I haven't noticed this problem in latest VB6 conversion project, which targets Framework-8.0, since I couldn't create a new project for 4.8 with this VS22, whose version is the latest I've been offered, 17.12.4. I'll probably check that in a day or two.
Tianyu Sun-MSFT 34,456 Reputation points Microsoft External Staff

2025-03-11T12:45:08.7266667+00:00

Hi @peter rumsey ,

Thanks for the detail information.

Is this issue replicated in a newly created .NET Framework 4.8 WinForm project, on your side? I tested the .NET Framework 4.8 WinForm project but still failed to replicate it.

I'll probably check that in a day or two

Once you checked that, feel free to let us know the results.
peter rumsey 20 Reputation points

2025-03-11T19:56:39.14+00:00

With VS2022, I am unable to create a new Framework 4.8 project. Only 6.0, 7.0, 8.0, and 9.0. Sorry. I have many old 4.8 projects. I'll look around for a really simple one - probably a reusable form with a test project. I did test my new 8.0 project, which doesn't have the problem.
peter rumsey 20 Reputation points

2025-03-13T03:15:12.12+00:00

So, I tried to strip the offending project down to minimal, and it still failed with only a Form, a MenuStrip, a MenuStripItem, and two lines of code in its Click handler. Breakpoint on the first, change the second, step and HotReload refuses. I tried to make a project out of three files - the .vbproj, form.vb, and its designer.vb. Had to add a bunch of ancillary stuff to get it compiled, so I tried a different tack and deleted no longer used stuff from .vbproj - that made it work! So I slowed down and discovered that it starts working when the last Resource is removed. The original project had two - an Icon and a Html help message. Turns out it fails when any resource is in the collection - I checked a text file, an icon, and a string. I don't know yet whether my 8.0 project will fail when I add an Icon to it. But at least now you should be able to replicate the problem.
Tianyu Sun-MSFT 34,456 Reputation points Microsoft External Staff

2025-03-14T08:49:31.0433333+00:00

Hi @peter rumsey ,

Thank you for taking the time to test. I followed to add the controls you mentioned, in a newly created project(WinForm VB), includes an icon as the resource. Hot reload worked as normal.

Is it possible for you to share us a minimal replicated sample project (avoid the privacy information. If you can't attach the project, the complete steps to replicate this issue are also useful) to test further?

Regards,

Tianyu
peter rumsey 20 Reputation points

2025-03-14T21:04:30.83+00:00

It won't let me paste a ZIP file. How to I get it to you. Like I said I had to leave lots of ancillary stuff in to get it to compile. Maybe I can do it this way: https://drive.google.com/file/d/1AUERFkkVi1FkIQg8WhHN32vGgRUqXPuu/view?usp=sharing

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Tianyu Sun-MSFT 34,456 Reputation points Microsoft External Staff

2025-03-07T09:39:17.56+00:00

Hi @peter rumsey ,

Thank you for sharing us the code sample. I tested like following but failed to reproduce this issue.

Would you mind sharing us the complete code sample to test further?

Besides, which version of VS 2022 are you using? Are you using the latest version(currently 17.13.2)? If you are using a previous version of VS 2022, would you mind trying to update it to the latest one?

Looking forward to hearing from you.
peter rumsey 20 Reputation points

2025-03-08T21:32:53.75+00:00

Upon further testing, it would appear that issue might be that hot reload doesn't work ANYWHERE in a method with a Handles clause targeting VB.Net Framework-4.8. A tedious workaround is to replace Handles clauses with AddHandler statements in an OnLoad override. Unfortunately, that breaks the one-click generation of the Handles-clause event handler, making that process more tedious.

I haven't noticed this problem in latest VB6 conversion project, which targets Framework-8.0, since I couldn't create a new project for 4.8 with this VS22, whose version is the latest I've been offered, 17.12.4. I'll probably check that in a day or two.
Tianyu Sun-MSFT 34,456 Reputation points Microsoft External Staff

2025-03-11T12:45:08.7266667+00:00

Hi @peter rumsey ,

Thanks for the detail information.

Is this issue replicated in a newly created .NET Framework 4.8 WinForm project, on your side? I tested the .NET Framework 4.8 WinForm project but still failed to replicate it.

I'll probably check that in a day or two

Once you checked that, feel free to let us know the results.
peter rumsey 20 Reputation points

2025-03-11T19:56:39.14+00:00

With VS2022, I am unable to create a new Framework 4.8 project. Only 6.0, 7.0, 8.0, and 9.0. Sorry. I have many old 4.8 projects. I'll look around for a really simple one - probably a reusable form with a test project. I did test my new 8.0 project, which doesn't have the problem.
peter rumsey 20 Reputation points

2025-03-13T03:15:12.12+00:00

So, I tried to strip the offending project down to minimal, and it still failed with only a Form, a MenuStrip, a MenuStripItem, and two lines of code in its Click handler. Breakpoint on the first, change the second, step and HotReload refuses. I tried to make a project out of three files - the .vbproj, form.vb, and its designer.vb. Had to add a bunch of ancillary stuff to get it compiled, so I tried a different tack and deleted no longer used stuff from .vbproj - that made it work! So I slowed down and discovered that it starts working when the last Resource is removed. The original project had two - an Icon and a Html help message. Turns out it fails when any resource is in the collection - I checked a text file, an icon, and a string. I don't know yet whether my 8.0 project will fail when I add an Icon to it. But at least now you should be able to replicate the problem.
Tianyu Sun-MSFT 34,456 Reputation points Microsoft External Staff

2025-03-14T08:49:31.0433333+00:00

Hi @peter rumsey ,

Thank you for taking the time to test. I followed to add the controls you mentioned, in a newly created project(WinForm VB), includes an icon as the resource. Hot reload worked as normal.

Is it possible for you to share us a minimal replicated sample project (avoid the privacy information. If you can't attach the project, the complete steps to replicate this issue are also useful) to test further?

Regards,

Tianyu
peter rumsey 20 Reputation points

2025-03-14T21:04:30.83+00:00

It won't let me paste a ZIP file. How to I get it to you. Like I said I had to leave lots of ancillary stuff in to get it to compile. Maybe I can do it this way: https://drive.google.com/file/d/1AUERFkkVi1FkIQg8WhHN32vGgRUqXPuu/view?usp=sharing

Answer 1

Tianyu Sun-MSFT 34,456 Microsoft External Staff

Hi @peter rumsey ,

Thank you very much for sharing the sample project.

I can reproduce this issue.

I notice that the hot reload issue you got is impacted by the configuration for AssemblyVersion property.

In AssemblyInfo.vb file, it was set to <Assembly:AssemblyVersion("2.0.*")>(with <Deterministic> property set to false, in the .vbproj file).

User's image

By the way, the AssemblyVersion property can be set/checked by right-clicking the project > Properties > Application > Assembly Information > Assembly version.

User's image

After researching and analyzing, I doubt that this is a potential issue. I suggest you submit a ticket on our Developer Community(in VS, click Help > Send Feedback > Report a Problem) and direct report this issue to Visual Studio Product Team.

Currently, if you want to mitigate this issue, you can set and use a specific assembly version, instead of using wildcard *.

For example, changing 2.0.* to 2.0.0.0.

User's image

Update1:

Above is the direct cause, not the root cause.

Further tests show that even using .NET 9 projects, this issue persists.

As the error message shows very specific, I have reported this issue.

Here's the ticket link: The VB WinForm project shows ENC0005 error while debugging in VS 2022 and using hot reload. Kindly try to follow that ticket and wait for the latest information.

By the way, the "Restart Application" option is a little quicker for restarting the application in this situation.

User's image

Kind regards,

Tianyu

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peter rumsey 20 Reputation points

2025-03-20T01:40:37.7433333+00:00

Thank you for taking the time to research this, but I can't accept the explanation as a solution. It is only an even MORE tedious workaround. I'd have to manually update the version number every time I rebuild, or not be able to know which version a user has when a complaint is lodged.

Why does 'nonDeterministic' only affect Hot Reload for Functions with Handles clauses? There seems to be no connection.
Tianyu Sun-MSFT 34,456 Reputation points Microsoft External Staff

2025-03-20T06:55:48.9433333+00:00

Hi @peter rumsey ,

Yes, I agree with you. I just find the direct cause, not the root cause.

Further tests show that even using .NET 9 projects, this issue persists.

The error message shows very specific, it seems that this issue only affects Hot Reload for Functions with Handles clauses.

I don’t think there’s one option that currently can "repair" this issue, this issue needs to be reported to the product team.

I’m not sure if you have submitted a feedback ticket, anyway, here’s mine => The VB WinForm project shows ENC0005 error while debugging in VS 2022 and using hot reload. You can follow that ticket and kindly wait for the latest information.

By the way, the "Restart Application" option is a little quicker for restarting the application in this situation. Just a side note.

Let me know if you have any further concerns.

Regards,

Tianyu
peter rumsey 20 Reputation points

2025-03-21T00:05:41.1066667+00:00

That comment would satisfy my needs as an answer,if you'd allow it, since it keeps the complaint alive. Sorry I didn't do it for you.
Tianyu Sun-MSFT 34,456 Reputation points Microsoft External Staff

2025-03-21T09:03:39.7033333+00:00

No problem @peter rumsey .

I will try to update my answer and make it more complete.

You can continue follow the ticket that I reported. Once there’s any information, you will be informed.

Have a great day :D

Tianyu

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In VS2022, VB hot reload never works, claiming ENC0005, when Handles is not relevant

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