Scaffolding exceptions for Blazor Web App about scaffolding HOT 8 OPEN

I'm facing the same issue.
Target framework: .NET 8.0
Operating system: Windows
IDE: Visual Studio 17.10.1

from scaffolding.

@Ksdmg: Do you found a solution? I have the same issuce in .NET 8.0

from scaffolding.

I ran into this issue today.
What is the precise cause?
Anyone got a solution/work around?
@Ksdmg @elbec

Using database provider 'Npgsql.EntityFrameworkCore.PostgreSQL'!
Value cannot be null. (Parameter 'path')
at Microsoft.VisualStudio.Web.CodeGeneration.ActionInvoker.b__6_0()
at Microsoft.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args)
at Microsoft.VisualStudio.Web.CodeGeneration.ActionInvoker.Execute(String[] args)
at Microsoft.VisualStudio.Web.CodeGeneration.CodeGenCommand.Execute(String[] args)

from scaffolding.

Hello, yes i found yesterday a workaround for me. It did not work for me directly in Visual Stuido. But when i run in project folder with cmd dotnet aspnet-codegenerator identity. Then all files were created without an error!

from scaffolding.

I have a IDesignTimeDbContextFactory, that creates a DbContext. I have checked this by launching a debugger during scaffolding. When the IDesignTimeDbContextFactory returns the DbContext, I still get:

Using database provider 'Npgsql.EntityFrameworkCore.PostgreSQL'!
Value cannot be null. (Parameter 'path')
at Microsoft.VisualStudio.Web.CodeGeneration.ActionInvoker.b__6_0()
at Microsoft.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args)
at Microsoft.VisualStudio.Web.CodeGeneration.ActionInvoker.Execute(String[] args)
at Microsoft.VisualStudio.Web.CodeGeneration.CodeGenCommand.Execute(String[] args)

Is there any more information on this error? What is the Parameter 'path'?

from scaffolding.

In the very latest VS, with all updates, in my project I have tried:

1. EF Migrations, and they work perfectly.
2. RtClick > Add >New Scaffold Item > Razor Pages > Razor Pages using Entity Framwork (CRUD)
   This works perfectly.
3. RtClick > Add >New Scaffold Item > Razor Component > Razor Components using Entity Framwork (CRUD)
   I get the output:

Building project ...
Finding the generator 'blazor'...
Running the generator 'blazor'...
Attempting to figure out the EntityFramework metadata for the model and DbContext: 'RadProjectItem'

Using database provider 'Npgsql.EntityFrameworkCore.PostgreSQL'!

Value cannot be null. (Parameter 'path')
at Microsoft.VisualStudio.Web.CodeGeneration.ActionInvoker.b__6_0()
at Microsoft.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args)
at Microsoft.VisualStudio.Web.CodeGeneration.ActionInvoker.Execute(String[] args)
at Microsoft.VisualStudio.Web.CodeGeneration.CodeGenCommand.Execute(String[] args)

There is no information anywhere to be found.

from scaffolding.

The App.razor file must exist in order for scaffolding to work. I am not using the App.razor file, therefore I removed it. Adding it back into the project makes the scaffolding operation complete without error.

from scaffolding.

For me it worked to add back the NavMenu. I looked up what got changed in a new project. Those were these files:

from scaffolding.