从另一个项目添加对 ApiAuthorizationDbContext 的迁移 - EF Core

Question

I'm trying to add migration for ApiAuthorizationDbContext from another .NET Core project but cannot instantiate it from design time since I don't know how to get the 2nd parameter IOptions<OperationalStoreOptions> .

This is my DbContext constructor (which inherits my custom ApiAuthorizationDbContext that accepts TUser, TRole, TKey)

public class ApplicationDbContext : ApiAuthorizationDbContext<ApplicationUser, ApplicationRole, Guid>
{
    public ApplicationDbContext (DbContextOptions options, IOptions<OperationalStoreOptions> operationalStoreOptions)
        : base(options, operationalStoreOptions)
    {
    }

This is my DesignTimeDbContextFactory

public class DesignTimeDbContextFactory : IDesignTimeDbContextFactory<KontestDbContext>
{
    public ApplicationDbContext CreateDbContext(string[] args)
    {
        IConfiguration configuration = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json").Build();

        var builder = new DbContextOptionsBuilder<ApplicationDbContext>();
        var connectionString = configuration.GetConnectionString("DefaultConnection");
        builder.UseSqlServer(connectionString);

        return new ApplicationDbContext(builder.Options, ????); <--- how to resolve the IOptions<OperationStoreOptions> here ??
    }
}

I found an answer from this issue in GitHub but still can not figure out a way how to resolve this param.

I also tried to inject the IOptions<> to the constructor but when add-migration, it throws an exception that the parameterless constructor of DesignTimeDbContextFactory is not found

Can somebody give me a hint through this, I'm quite new to .NET Core / EF Core here and will very much appericiate if someone can help!

(I'm using .NET Core 3.0 and Entity Framework Core)

Answer 1

Create OperationalStoreOptionsMigrations inheriting the IOptions and pass OperationalStoreOptionsMigrations object. See my answer.

1. Create OperationalStoreOptionsMigrations method.

    public class OperationalStoreOptionsMigrations : IOptions<OperationalStoreOptions> { public OperationalStoreOptions Value => new OperationalStoreOptions() { DeviceFlowCodes = new TableConfiguration("DeviceCodes"), EnableTokenCleanup = false, PersistedGrants = new TableConfiguration("PersistedGrants"), TokenCleanupBatchSize = 100, TokenCleanupInterval = 3600, }; }

2. change DesignTimeDbContextFactory

    public class DesignTimeDbContextFactory : IDesignTimeDbContextFactory<KontestDbContext> { public ApplicationDbContext CreateDbContext(string[] args) { IConfiguration configuration = new ConfigurationBuilder() .SetBasePath(Directory.GetCurrentDirectory()) .AddJsonFile("appsettings.json").Build(); var builder = new DbContextOptionsBuilder<ApplicationDbContext>(); var connectionString = configuration.GetConnectionString("DefaultConnection"); builder.UseSqlServer(connectionString); return new ApplicationDbContext(builder.Options, new OperationalStoreOptionsMigrations()); } }

Answer 2

Pass your IOptions<OprerationalStoreOption> as a parameter in the constructor then you can use it wherever you need to. Then register the IOptions service in the DI container. Something like this

public ApplicationDbContext CreateDbContext(string[] args, Options<OperationStoreOptions> optionsBuilder)
    {
        IConfiguration configuration = new ConfigurationBuilder()


        return new ApplicationDbContext(builder.Options, optionsBuilder);
    }