Quote from Ingo on October 11, 2019, 12:49 pm

Hi,

By default, I had to move the migration from QuickApp.pro to the DAL. Since I have a console application which also uses the DAL. I changed the class DesignTimeDbContextFactory as follows.

builder.UseSqlServer(configuration["ConnectionStrings:DefaultConnection"], b => b.MigrationsAssembly("DAL"));

I changed the class Startup as follows.

services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlServer(Configuration["ConnectionStrings:DefaultConnection"], b => b.MigrationsAssembly("DAL")));

DAL.csproj  I add

<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="2.2.6" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.2.6" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.2.6">
    <PrivateAssets>all</PrivateAssets>
    <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
</PackageReference>

If I am in the package manager for example:

Select the DAL and enter add-migration Vers14, the migration was created.

In version 3.0 I did the same:

DAL.csproj  I add

<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="3.0.0">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
</PackageReference>
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.0.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.0.0">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
</PackageReference>

If I am in the package manager for example:

Select the DAL and enter add-migration Vers14, the migration was not created.

Unable to create an object of type 'ApplicationDbContext'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728

The link is not helpful because all calls are available. If it's helpful to you, I'm happy to send you my code.

What can I do???

regards Ingo