Apply Code Changes button not working in Visual Studio 2019

Question

Apply Code Changes button not working in Visual Studio 2019

Joe Green 146

In Visual Studio 2019, 'Apply Code Changes' button next to Continue doesn't work when running asp.Net core web application using IIS Express on devlopment machine. Am I missing some setting in Visual Studio 2019?

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PengGe-MSFT 3,381

Hi, @Joe Green

Welcome to Microsoft Q&A!

What type of code did you modify? Hot reload supports modify your apps managed source code while the application is running.

To try Hot Reload in Visual Studio when using the debugger:

Download and install Visual Studio 2019 version 16.11 Preview 1
Open a supported project type, for example a WPF app
Launch the app with the debugger attached through F5 (make sure that “enable native code debugging” is disabled in debugger settings/debug launch profile)
Open a C# code file with some code that can be re-executed through the running apps user interface (example: code-behind of a button or a ViewModel’s command) or something that is being triggered at an interval through a timer and change the code
Apply the code changes using the new apply code changes (ALT-F10) button in your Visual Studio toolbar (next to the Continue button). Note that saving the files is not required when using Visual Studio, giving you the flexibility to quickly change code and keep going.

You can refer to this blog.

Sincerely,
Peng
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Joe Green 146 Reputation points

2021-10-13T12:15:30.447+00:00

I'm using VS 2019 Community Edition 16.11.4. I'm using Asp.Net Core Web App (Model-View-Controller) template from VS. Enable native code debug option not selected. When I run the project using F5, if I make a change to view or controller and then click on Apply Code Changes button, I don't see the change until, I stop debugging and run project again using F5. Does my project type doesn't support Hot Reload feature?
PengGe-MSFT 3,381 Reputation points

2021-10-14T09:37:26.093+00:00

Hi, @Joe Green
According to the release notes, your project supports hot reloading. I found a similar thread, which may be helpful to you.
Joe Green 146 Reputation points

2021-10-14T13:36:41.373+00:00

Thanks for reply. I checked the thread but it doesn't work for me.
PengGe-MSFT 3,381 Reputation points

2021-10-15T09:11:46.34+00:00

Hi, @Joe Green
You can try to reload your project, repair Visual Studio, use the /Safemode or /Resettings commands to start Visual Studio.
You can also try to create a new ASP.NET Core project, and then check whether the Apply Code Changes button works.
If the problem persists, I suggest you can start a new thread and report this issue to VS Product Team in our Developer Community with some reproduced or detailed information. if you do report this issue, please share the link here, other forum members who are interested or meet the same or similar issue can go to vote for this thread.
David Eugene Simon 1 Reputation point

2021-10-19T22:59:27.817+00:00

Was having similar issues, basically what I found was that you have to save your code changes before hitting the hot reload button, then it seems to work. Hope that helps...
PengGe-MSFT 3,381 Reputation points

2021-10-20T09:28:58.86+00:00

It looks like this is a bug, I suggest you start a new thread and report this issue to VS Product Team in our Developer Community with some reproduced or detailed information.

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Apply Code Changes button not working in Visual Studio 2019

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