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Fails to start with VSCode #1022

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opened 2026-01-29 16:55:25 +00:00 by claunia · 11 comments
claunia commented 2026-01-29 16:55:25 +00:00
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Originally created by @markatosi on GitHub (Nov 25, 2025).

  • 0.2:
  • .Net 10:

Application fails to start when running through VSCode using Run and Debug with c# Dev kit

GatherBuildInfo: No testhost detected: BlazorApp1
Probe scored for launch origin:   DotNet 3 vs. 0 Electron
Probe scored for package mode:   Unpackaged 4 vs. 0 Packaged
Evaluated StartupMethod: UnpackedDotnetFirst
dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BlazorWasmHotReloadMiddleware[0]
      Middleware loaded
Microsoft.AspNetCore.Watch.BrowserRefresh.BlazorWasmHotReloadMiddleware: Debug: Middleware loaded
Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserScriptMiddleware: Debug: Middleware loaded. Script /_framework/aspnetcore-browser-refresh.js (16459 B).
dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserScriptMiddleware[0]
      Middleware loaded. Script /_framework/aspnetcore-browser-refresh.js (16459 B).
dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserScriptMiddleware[0]
      Middleware loaded. Script /_framework/blazor-hotreload.js (799 B).
Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserScriptMiddleware: Debug: Middleware loaded. Script /_framework/blazor-hotreload.js (799 B).
[StartInternal]: startCmd: /Volumes/Repos_APFS/source/electron/BlazorApp1/bin/Debug/net10.0/osx-arm64/.electron/node_modules/electron/dist/Electron.app/Contents/MacOS/Electron
[StartInternal]: args: main.js -unpackeddotnet --trace-warnings -electronforcedport=8002 /Volumes/Repos_APFS/source/electron/BlazorApp1/bin/Debug/net10.0/osx-arm64/BlazorApp1.dll
dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserRefreshMiddleware[0]
      Middleware loaded: DOTNET_MODIFIABLE_ASSEMBLIES=debug, __ASPNETCORE_BROWSER_TOOLS=true
Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserRefreshMiddleware: Debug: Middleware loaded: DOTNET_MODIFIABLE_ASSEMBLIES=debug, __ASPNETCORE_BROWSER_TOOLS=true
info: Microsoft.Hosting.Lifetime[14]
      Now listening on: http://localhost:8003
Microsoft.Hosting.Lifetime: Information: Now listening on: http://localhost:8003
Microsoft.Hosting.Lifetime: Information: Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Development
Microsoft.Hosting.Lifetime: Information: Hosting environment: Development
info: Microsoft.Hosting.Lifetime[0]
      Content root path: /Volumes/Repos_APFS/source/electron/BlazorApp1
Microsoft.Hosting.Lifetime: Information: Content root path: /Volumes/Repos_APFS/source/electron/BlazorApp1
|| /Volumes/Repos_APFS/source/electron/BlazorApp1/bin/Debug/net10.0/osx-arm64/.electron/main.js:28
|| if (app.commandLine.hasSwitch('manifest')) {
||         ^
|| 
|| TypeError: Cannot read properties of undefined (reading 'commandLine')
||     at Object.<anonymous> (/Volumes/Repos_APFS/source/electron/BlazorApp1/bin/Debug/net10.0/osx-arm64/.electron/main.js:28:9)
||     at Module._compile (node:internal/modules/cjs/loader:1714:14)
||     at Module._extensions..js (node:internal/modules/cjs/loader:1848:10)
||     at Module.load (node:internal/modules/cjs/loader:1448:32)
||     at Module._load (node:internal/modules/cjs/loader:1270:12)
||     at c._load (node:electron/js2c/node_init:2:17993)
||     at TracingChannel.traceSync (node:diagnostics_channel:322:14)
||     at wrapModuleLoad (node:internal/modules/cjs/loader:244:24)
||     at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:186:5)
||     at node:internal/main/run_main_module:36:49
|| 
|| Node.js v22.19.0
[StartInternal]: after run:
info: Microsoft.Hosting.Lifetime[0]
      Application is shutting down...
Microsoft.Hosting.Lifetime: Information: Application is shutting down...
2
[StartInternal]: Process is not running: 
2
[StartInternal]: Exception: 
[StartInternal]: Exception: System.Exception: Failed to launch the Electron process.
   at ElectronNET.Runtime.Services.ElectronProcess.ElectronProcessActive.StartInternal(String startCmd, String args, String directoriy)
The program '[87635] BlazorApp1' has exited with code 0 (0x0).

Steps to Reproduce:

  1. Try to run application in VSCode via c# dev kit Solution explorer
  2. Right click project and select Debug | Start New Instance
Originally created by @markatosi on GitHub (Nov 25, 2025). <!-- Please search existing issues to avoid creating duplicates. --> <!-- Which version of Electron.NET CLI and API are you using? --> <!-- Please always try to use latest version before report. --> * **0.2**: <!-- Which version of .NET Core and Node.js are you using (if applicable)? --> <!-- What target are you building for? --> * **.Net 10**: <!-- Enter your issue details below this comment. --> Application fails to start when running through VSCode using Run and Debug with c# Dev kit ``` GatherBuildInfo: No testhost detected: BlazorApp1 Probe scored for launch origin: DotNet 3 vs. 0 Electron Probe scored for package mode: Unpackaged 4 vs. 0 Packaged Evaluated StartupMethod: UnpackedDotnetFirst dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BlazorWasmHotReloadMiddleware[0] Middleware loaded Microsoft.AspNetCore.Watch.BrowserRefresh.BlazorWasmHotReloadMiddleware: Debug: Middleware loaded Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserScriptMiddleware: Debug: Middleware loaded. Script /_framework/aspnetcore-browser-refresh.js (16459 B). dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserScriptMiddleware[0] Middleware loaded. Script /_framework/aspnetcore-browser-refresh.js (16459 B). dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserScriptMiddleware[0] Middleware loaded. Script /_framework/blazor-hotreload.js (799 B). Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserScriptMiddleware: Debug: Middleware loaded. Script /_framework/blazor-hotreload.js (799 B). [StartInternal]: startCmd: /Volumes/Repos_APFS/source/electron/BlazorApp1/bin/Debug/net10.0/osx-arm64/.electron/node_modules/electron/dist/Electron.app/Contents/MacOS/Electron [StartInternal]: args: main.js -unpackeddotnet --trace-warnings -electronforcedport=8002 /Volumes/Repos_APFS/source/electron/BlazorApp1/bin/Debug/net10.0/osx-arm64/BlazorApp1.dll dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserRefreshMiddleware[0] Middleware loaded: DOTNET_MODIFIABLE_ASSEMBLIES=debug, __ASPNETCORE_BROWSER_TOOLS=true Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserRefreshMiddleware: Debug: Middleware loaded: DOTNET_MODIFIABLE_ASSEMBLIES=debug, __ASPNETCORE_BROWSER_TOOLS=true info: Microsoft.Hosting.Lifetime[14] Now listening on: http://localhost:8003 Microsoft.Hosting.Lifetime: Information: Now listening on: http://localhost:8003 Microsoft.Hosting.Lifetime: Information: Application started. Press Ctrl+C to shut down. info: Microsoft.Hosting.Lifetime[0] Application started. Press Ctrl+C to shut down. info: Microsoft.Hosting.Lifetime[0] Hosting environment: Development Microsoft.Hosting.Lifetime: Information: Hosting environment: Development info: Microsoft.Hosting.Lifetime[0] Content root path: /Volumes/Repos_APFS/source/electron/BlazorApp1 Microsoft.Hosting.Lifetime: Information: Content root path: /Volumes/Repos_APFS/source/electron/BlazorApp1 || /Volumes/Repos_APFS/source/electron/BlazorApp1/bin/Debug/net10.0/osx-arm64/.electron/main.js:28 || if (app.commandLine.hasSwitch('manifest')) { || ^ || || TypeError: Cannot read properties of undefined (reading 'commandLine') || at Object.<anonymous> (/Volumes/Repos_APFS/source/electron/BlazorApp1/bin/Debug/net10.0/osx-arm64/.electron/main.js:28:9) || at Module._compile (node:internal/modules/cjs/loader:1714:14) || at Module._extensions..js (node:internal/modules/cjs/loader:1848:10) || at Module.load (node:internal/modules/cjs/loader:1448:32) || at Module._load (node:internal/modules/cjs/loader:1270:12) || at c._load (node:electron/js2c/node_init:2:17993) || at TracingChannel.traceSync (node:diagnostics_channel:322:14) || at wrapModuleLoad (node:internal/modules/cjs/loader:244:24) || at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:186:5) || at node:internal/main/run_main_module:36:49 || || Node.js v22.19.0 [StartInternal]: after run: info: Microsoft.Hosting.Lifetime[0] Application is shutting down... Microsoft.Hosting.Lifetime: Information: Application is shutting down... 2 [StartInternal]: Process is not running: 2 [StartInternal]: Exception: [StartInternal]: Exception: System.Exception: Failed to launch the Electron process. at ElectronNET.Runtime.Services.ElectronProcess.ElectronProcessActive.StartInternal(String startCmd, String args, String directoriy) The program '[87635] BlazorApp1' has exited with code 0 (0x0). ``` <!-- If you want, you can donate to increase issue priority (https://donorbox.org/electron-net) --> Steps to Reproduce: 1. Try to run application in VSCode via c# dev kit Solution explorer 2. Right click project and select Debug | Start New Instance
claunia added the bugdev-experience labels 2026-01-29 16:55:25 +00:00
claunia commented 2026-01-29 16:55:26 +00:00
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@FlorianRappl commented on GitHub (Nov 26, 2025):

Not sure if VS code is the issue... From the logs I see that you run it on MacOS.

What's your npm (and Node.js) version?

@FlorianRappl commented on GitHub (Nov 26, 2025): Not sure if VS code is the issue... From the logs I see that you run it on MacOS. What's your npm (and Node.js) version?
claunia commented 2026-01-29 16:55:27 +00:00
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@markatosi commented on GitHub (Nov 26, 2025):

npm 10.9.0
node v22.12.0

Yes I'm on a mac when i'm not using VS Studio 2026 on win 11 in Parallels. On the mac host I use Jetbrains Rider 99.99% of the time.

This was just a test in vs code to see what would happen. I'm a vs code noob so I could be doing something wrong but I
just started the app the way Microsoft recommends one starts c# apps in vs code with the dev kit.

Works fine in Rider of course.

I guess if anyone else can start the app properly from vs code on a mac then we can point the finger at me for now knowing what I'm doing :-)

https://code.visualstudio.com/docs/csharp/debugging

@markatosi commented on GitHub (Nov 26, 2025): npm 10.9.0 node v22.12.0 Yes I'm on a mac when i'm not using VS Studio 2026 on win 11 in Parallels. On the mac host I use Jetbrains Rider 99.99% of the time. This was just a test in vs code to see what would happen. I'm a vs code noob so I could be doing something wrong but I just started the app the way Microsoft recommends one starts c# apps in vs code with the dev kit. Works fine in Rider of course. I guess if anyone else can start the app properly from vs code on a mac then we can point the finger at me for now knowing what I'm doing :-) https://code.visualstudio.com/docs/csharp/debugging
claunia commented 2026-01-29 16:55:27 +00:00
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@markatosi commented on GitHub (Nov 26, 2025):

In the log message it's mentioning node v22.19 which is not installed on my machine. The wiki just says to have node 22.x or later. At any rate i have now updated to node v22.21.1

No change. rider still works, vscode doesn't.

dotnet run works as usual.

@markatosi commented on GitHub (Nov 26, 2025): In the log message it's mentioning node v22.19 which is not installed on my machine. The wiki just says to have node 22.x or later. At any rate i have now updated to node v22.21.1 No change. rider still works, vscode doesn't. dotnet run works as usual.
claunia commented 2026-01-29 16:55:27 +00:00
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@FlorianRappl commented on GitHub (Dec 9, 2025):

I just tried this and everything seems to work fine. Can you provide your project in form of a repository on GitHub? This would help reproducing / identifying the issue. Many thanks!

@FlorianRappl commented on GitHub (Dec 9, 2025): I just tried this and everything seems to work fine. Can you provide your project in form of a repository on GitHub? This would help reproducing / identifying the issue. Many thanks!
claunia commented 2026-01-29 16:55:28 +00:00
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@markatosi commented on GitHub (Dec 9, 2025):

Hi Florian, I’ll post the project in the next couple of days. I’m on a plane for the next day or so.

@markatosi commented on GitHub (Dec 9, 2025): Hi Florian, I’ll post the project in the next couple of days. I’m on a plane for the next day or so.
claunia commented 2026-01-29 16:55:28 +00:00
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@markatosi commented on GitHub (Dec 11, 2025):

https://github.com/markatosi/BlazorApp1

@markatosi commented on GitHub (Dec 11, 2025): https://github.com/markatosi/BlazorApp1
claunia commented 2026-01-29 16:55:29 +00:00
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@markatosi commented on GitHub (Dec 12, 2025):

I removed the Blazor1 repo and created Blazor2 as Blazor1 was full of junk that didn't need to be there.

https://github.com/markatosi/BlazorApp2

@markatosi commented on GitHub (Dec 12, 2025): I removed the Blazor1 repo and created Blazor2 as Blazor1 was full of junk that didn't need to be there. https://github.com/markatosi/BlazorApp2
claunia commented 2026-01-29 16:55:30 +00:00
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@FlorianRappl commented on GitHub (Dec 13, 2025):

I am confused. The project does not use Electron.NET or integrate it at all. So I'll need to close this one unless you provide a MWE to reproduce your issue with Electron.NET.

@FlorianRappl commented on GitHub (Dec 13, 2025): I am confused. The project does not use Electron.NET or integrate it at all. So I'll need to close this one unless you provide a MWE to reproduce your issue with Electron.NET.
claunia commented 2026-01-29 16:55:31 +00:00
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@markatosi commented on GitHub (Dec 13, 2025):

Sorry about that i did the initial commit and made the additions to add electron.net then got pulled away on something else and forgot to commit the new update. It's there now

@markatosi commented on GitHub (Dec 13, 2025): Sorry about that i did the initial commit and made the additions to add electron.net then got pulled away on something else and forgot to commit the new update. It's there now
claunia commented 2026-01-29 16:55:31 +00:00
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@FlorianRappl commented on GitHub (Dec 13, 2025):

Alright thanks - I can actually reproduce it. Will be fixed in 0.3.0.

@FlorianRappl commented on GitHub (Dec 13, 2025): Alright thanks - I can actually reproduce it. Will be fixed in 0.3.0.
claunia commented 2026-01-29 16:55:31 +00:00
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@FlorianRappl commented on GitHub (Dec 14, 2025):

Fixed with most recent preview (0.3.0-pre.4).

@FlorianRappl commented on GitHub (Dec 14, 2025): Fixed with most recent preview (0.3.0-pre.4).
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