问题
Since EF Core migrated to Microsoft.EntityFrameworkCore.* (instead of EntityFramework.*), it seems that the recommended command line to add db migrations is back to add-migration from package manager.
ef core add migration documentation
However it seems there isn't a package anymore for commands and that the package installation of v 1.0.1 doesn't add any command.
The error message I'm getting when running Add-Migration is
Cannot execute this command because EntityFramework.Commands is not installed in the startup project 'project name'.
Did I miss something? Is there a new way to add the commands or so? Thanks for your help!
回答1:
In order to use the Package Manager Console commands (e.g. Add-Migration) on .NET Core projects, your project.json will need to look something like this.
{
"dependencies": {
"Microsoft.EntityFrameworkCore.Sqlite": "1.0.1",
"Microsoft.EntityFrameworkCore.Tools": {
"version": "1.0.0-preview2-final",
"type": "build"
}
},
"tools": {
"Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final"
}
}
The Microsoft.EntityFrameworkCore.Tools under dependencies ensures the PowerShell commands get registered. It's "type": "build" ensures they don't get published with your application. The Microsoft.EntityFrameworkCore.Tools under dependencies ensures the dotnet ef command gets registered (which is called by the PowerShell commands).
来源：https://stackoverflow.com/questions/39751199/entity-framework-core-1-0-1-add-migration