Fails to start with VSCode

[markatosi]

• 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

[FlorianRappl]

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?

[markatosi]

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]

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.