Error when scaffolding in ASP.NET Core MVC

Question

Error when scaffolding in ASP.NET Core MVC

Jędrzej Koriat 5

Hello!

I have an error whenever I try to scaffold a new scaffold element: User's image

It says:

"Error

An error occurred while running the selected code generator:

"Exception of type 'System.InvalidOperationException' was thrown."

This is a link to my project: https://github.com/jedrulcia/TrainingPlanApp.Web.git

Thanks in advance!

Anonymous

2024-07-25T09:05:16.5733333+00:00

Hi @Jędrzej Koriat, I test your sample in my side and firstly I faced compile error in Assemblyinfo.cs which is auto-generate see screenshot below. I have to comment it, and then I can reproduce the same error message, even if I create a new class.

Then I found that you are using a localdb in appsettings.json. I think this might relate to database too, so that I had a test which using my localdb connection string instead of yours and this time I got a new issue like screenshot below. I think you might try to make sure the database you test have the corresponding tables as you used automapper in your project, for example create a new table and a corresponding new model, then try to scaffold controller for this new model.
Jędrzej Koriat 5 Reputation points

2024-07-25T16:35:16.57+00:00

I have the same issue when I try scaffolding the view model.

2 answers

Your answer

Anonymous

2024-07-25T09:05:16.5733333+00:00

Hi @Jędrzej Koriat, I test your sample in my side and firstly I faced compile error in Assemblyinfo.cs which is auto-generate see screenshot below. I have to comment it, and then I can reproduce the same error message, even if I create a new class.

Then I found that you are using a localdb in appsettings.json. I think this might relate to database too, so that I had a test which using my localdb connection string instead of yours and this time I got a new issue like screenshot below. I think you might try to make sure the database you test have the corresponding tables as you used automapper in your project, for example create a new table and a corresponding new model, then try to scaffold controller for this new model.
Jędrzej Koriat 5 Reputation points

2024-07-25T16:35:16.57+00:00

I have the same issue when I try scaffolding the view model.

Answer 1

Okay so I have observed that I had some issues since I added NUnit Test project to my solution. This was one of these issues that I had:
User's image

Whenever I opened the solution I had to comment these lines. However, I could work on my project anyways, so I wasn't bothered by it. But now I thought this could also affect scaffolding, and that was actually the issue. I have deleted the NUnit folder and project from my solution and it is working now. I do not need to have to unit tests for my project for now anyways, but leaving the comment if that would help anyone in future.

Answer 2

SurferOnWww 4,711

Please check if the versions of the NuGet packages required for the scaffolding match:

Microsoft.EntityFrameworkCore.SqlServer
Microsoft.EntityFrameworkCore.Tools
Microsoft.VisualStudio.Web.CodeGeneration.Design

Jędrzej Koriat 5 Reputation points

2024-07-25T16:29:36.53+00:00

I have installed 8.0.3 version for all packages, as it is the latest Microsoft.VisualStudio.Web.CodeGeneration.Design version:
And the result is still the same:

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Error when scaffolding in ASP.NET Core MVC

2 answers

Your answer