CODEWITHSUNDEEP
c#.netentity-framework-core.net-corescaffolding
Pandiarajan
Pandiarajan

Reputation: 430

Scaffold-DbContext throws error "Could not find assembly" in .net core

I am using .net core and entity framework core 1.1.0. while trying the following command in Package Manager Console

Scaffold-DbContext "Server=MyServer\\MyInstance;Database=MyDB;user=MyUsername;password=MyDbPassword;" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models -t Table1,Table2

I am getting this error

Could not find assembly 'D:\Work\Projects\src\MyProject\src\MyProject.Api.\bin\Debug\net461\win7-x64\MyProject.Data.exe'.

MyProject.Data is a net core library. MyProject.Api is a .net full framework core api, which references the MyProject.Data.

project.json file of MyProject.Data

{
  "version": "1.0.0-*",

  "dependencies": {
    "Microsoft.EntityFrameworkCore.Design": "1.1.0",
    "Microsoft.EntityFrameworkCore.SqlServer": "1.1.0",
    "Microsoft.EntityFrameworkCore.SqlServer.Design": "1.1.0",
    "Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final"
  },

  "frameworks": {
    "net461": {}
  }
}

Any advice for me?

Upvotes: 7

Views: 9469

Answers (3)

Benoit Andrieu
Benoit Andrieu

Reputation: 66

I have been trying to scaffold a FireBird database. The first issue is that the FireBird file was made in 32bit. Because of that, my project had to target x86. I had then messages "could not load assembly ensure it is referenced by the startup project". The solution to remove those messages was :

  • if using Firebird in embedded mode (without having to run a server instance) download the x86 Firebird package, copy fbembed.dll icudt30.dll icuuc30.dll msvcr80.dll side by side with the csproj
  • install the x86 net sdk
  • add C:\Program Files (x86)\dotnet\ in the system environment variables above C:\Program Files\dotnet\
  • in Powershell x86 : & 'C:\Program Files (x86)\dotnet\dotnet.exe' ef dbcontext scaffold "ServerType=1;Database=PATH_TO_THE_FDB;user id=THE_USER;password=THE_PASSWORD" FirebirdSql.EntityFrameworkCore.Firebird --configuration=debug --verbose, ServerType=1 is for using Firebird in embedded mode

What helped me to go down this path was this github issue, Procmon then helped me to see that the dotnet process was in x64.

Upvotes: 0

Sateesh Pagolu
Sateesh Pagolu

Reputation: 9606

Not sure if this is a bug, but scaffold-dbcontext command looks for the assembly in Startup Project.

There are two workarounds for this issue

  1. Right click on the project you intend to run this command on (in your case, it is MyProject.Data) and select Set as startup project.
  2. You can pass a parameter to scaffold-DBContext command to set a particular project as startup project while running the command. This is what you need to add at the end of command...

-StartupProject MyProject.Data

Upvotes: 14

Formalist
Formalist

Reputation: 369

It seems that this issue also occurs if the target platform is x86.

Switching to AnyCPU solves the problem.

Upvotes: 7

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