Unable to Scaffold-DbContext with EntityFrameworkCore.Jet

entity-framework-core jet-ef-provider

Question

I've been trying to generate the Entity Framework Models for an existing Database.

I'm using the EntityFrameworkCore.Jet-Provider (v2.1.0 preview 5) with EntityFrameworkCore (v2.1.2) in Visual Studio 2017. I used the following command within the Package Manager Console:

PM> Scaffold-DbContext -Connection "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\..\workplace\TestProject\demo.accdb;Jet OLEDB:Database Password=****;" -Provider EntityFrameworkCore.Jet -OutputDir Models -verbose

which gave me this output:

Using project 'TestProject'.
Using startup project 'TestProject'.
Build started...
Build succeeded.
...
Using assembly 'TestProject'.
Using startup assembly 'TestProject'.
Using application base 'C:\..\workplace\TestProject\bin\Debug'.
Using working directory 'C:\..\workplace\TestProject'.
Using root namespace 'TestProject'.
Using project directory 'C:\..\workplace\TestProject\'.
Using configuration file 'C:\..\workplace\TestProject\bin\Debug\TestProject.exe.config'.
Finding design-time services for provider 'EntityFrameworkCore.Jet'...
Using design-time services from provider 'EntityFrameworkCore.Jet'.
Finding design-time services referenced by assembly 'TestProject'.
No referenced design-time services were found.
Finding IDesignTimeServices implementations in assembly 'TestProject'...
No design-time services were found.
System.InvalidOperationException: Der 'Microsoft.ACE.OLEDB.12.0'-Provider ist nicht auf dem lokalen Computer registriert.
...
Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)

Der 'Microsoft.ACE.OLEDB.12.0'-Provider ist nicht auf dem lokalen Computer registriert.

Which translates to

The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine.

At first I expected this to be the case and did some research which brought me here and I followed the given solution, but the Problem persisted. Looking into the folder C:\Program Files (x86)\Common Files\microsoft shared contains the subfolders OFFICE12, OFFICE14 and OFFICE16 which each hold an ACEOLEDB.DLL.

Confirmed through use in a Code First approach the provider is actually registered and usable! But when used in the Package Manager it can't be found. Am I missing some specific reference?

Since the exact same ConnectionString is working when used with CodeFirst what could be the Issue? Or is EntityFrameworkCore.Jet not enabled for Database-First Approach?

1
0
8/31/2018 6:53:35 AM

Accepted Answer

Revisiting this Issue, I realised that the Compile Configuration had been set to Any CPU.

Mind that I have installed office 32bit and the corresponding 32bit driver set (see this and this)

While Code First will run in the Any CPU Configuration, the Package-Manager-Console does have a problem with this. PMC seems to be trying to resolve the x64-provider in this configuration.

Switching this setting to x86 in Visual Studio 2017 resolved that issue:

Using assembly 'TestProject'.
Using startup assembly 'TestProject'.
Using application base 'C:\..\workplace\TestProject\bin\x86\Debug'.
Using working directory 'C:\..\workplace\TestProject'.
Using root namespace 'TestProject'.
Using project directory 'C:\..\workplace\TestProject\'.
Using configuration file 'C:\..\workplace\TestProject\bin\x86\Debug\TestProject.exe.config'.

After switching the Compile Configuration of the Project/StartupProject to x86 PMC is able to resolve the Microsoft.ACE.OleDb.12.0 provider and successfully scaffold the database.

1
8/31/2018 6:38:42 AM


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