Asp.Net Core 1.0.0：Npgsql.EntityFrameworkCore.PostgreSQL迁移错误

Question

My Startup.cs :

    services.AddEntityFrameworkNpgsql()
    .AddDbContext<ApplicationDbContext>(o =>
        o.UseNpgsql(Configuration["Data:DefaultConnection:ConnectionString"]
    ));

My project.json :

"Npgsql.EntityFrameworkCore.PostgreSQL": "1.0.0",
"Microsoft.EntityFrameworkCore": "1.0.0",

My project's dotnet --version :

1.0.0-preview2-003121

Then dotnet ef migrations add First says

The current CSharpMigrationOperationGenerator cannot scaffold operations of type 'Microsoft.EntityFrameworkCore.Migrations.Operations.NpgsqlCreatePostgresExtensionOperation'. Configure your services to use one that can.

How can I specify an appropriate generator? Or maybe I'm doing wrong somewhere? Thank you in advance

Answer 1

This is a bug in the Npgsql EFCore provider, and has already been fixed: https://github.com/npgsql/Npgsql.EntityFrameworkCore.PostgreSQL/issues/58 . The next release will contain the fix.

Answer 2

Depending upon the version, you may need to add "Npgsql.EntityFrameworkCore.PostgreSQL.Design": "1.0.1" to your project.json file to get this to work. See this issue comment