Memoria

Integrate with ASP.NET Core Identity

Memoria’s EF Core store can share a DbContext with ASP.NET Core Identity, so user data and event-sourced aggregates live side by side in the same database, in the same transaction.

For the configuration surface, see Configuration: EF Core + Identity.

When to use this

• Existing ASP.NET Core Identity app, adding event sourcing without spinning up a second store.
• Your domain needs to atomically write Identity changes (e.g. a new user) alongside domain events.
• You want a single set of EF Core migrations.

If neither of these applies, the plain Memoria.EventSourcing.Store.EntityFrameworkCore package is simpler.

The shape

Your DbContext inherits from IdentityDomainDbContext instead of DomainDbContext. Everything else looks like a normal Memoria + EF Core setup:

public class ApplicationDbContext(
    DbContextOptions<DomainDbContext> options,
    TimeProvider timeProvider,
    IHttpContextAccessor httpContextAccessor)
    : IdentityDomainDbContext(options, timeProvider, httpContextAccessor)
{
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
    }

    public DbSet<ItemEntity> Items { get; set; } = null!;
}

services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)
    .AddEntityFrameworkStores<ApplicationDbContext>();

services
    .AddScoped(sp => new DbContextOptionsBuilder<DomainDbContext>()
        .UseSqlite(connectionString)
        .UseApplicationServiceProvider(sp)
        .Options);

services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlite(configuration.GetConnectionString("DefaultConnection")));

services.AddMemoriaEntityFrameworkCore<ApplicationDbContext>();

IdentityDomainDbContext is IdentityDbContext with Memoria’s event-sourcing tables added in OnModelCreating. Migrations cover both sets of tables.

Combining writes in one transaction

Use the TrackAggregate / TrackEventEntities / Save extensions on IDomainDbContext to combine an event-sourced write with Identity changes:

await userManager.CreateAsync(newUser, password);

var trackAggregateResult = await dbContext.TrackAggregate(
    streamId, profileId, profile, expectedEventSequence: 0);

await dbContext.Save();

Both writes share the same EF Core transaction — either both commit or neither does.

Related

• Configuration: EF Core + Identity
• EF Core Extensions
• Multiple aggregates per stream

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