// This method gets called by the runtime. Use this method to add services to the container.
// For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
public void ConfigureServices(IServiceCollection services)
{
// We want to run the API and MVC UI app on a single ASP.NET Core host but we cannot get along with a single DI container currently
// as endpoint routing is bugged regarding pipeline branches (https://github.com/dotnet/aspnetcore/issues/19330),
// so we need two application branches with isolated MVC-related and shared common services (like service layer services).
// Unfortunately, the built-in DI is insufficient for this setup, we need some more advanced solution like Autofac.
// As a matter of fact, Autofac could handle this situation out-of-the-box (https://autofaccn.readthedocs.io/en/latest/integration/aspnetcore.html#multitenant-support)
// but this approach also has issues currently (https://github.com/autofac/Autofac.AspNetCore.Multitenant/issues/27)
// The services defined here go into the root DI container and are accessible to the nested (tenant) containers.
// 1. register shared services and obtain options necessary for DI configuration
using (var optionsProvider = ApiStartup.BuildImmediateOptionsProvider(ConfigureImmediateOptions))
{
ApiStartup.ConfigureBaseServices(services, optionsProvider);
UIOptions = optionsProvider.GetRequiredService <IOptions <UIOptions> >().Value;
}
ConfigureOptions(services);
ConfigureServicesPartial(services);
// 2. register the tenants
services.AddSingleton(new Tenants(
new ApiTenant(ApiTenantId, this, typeof(Api.Startup).Assembly),
new UITenant(UITenantId, this, typeof(Startup).Assembly)));
// 3. finally register a startup filter which ensures that the main branch is set up before any other middleware added
services.Insert(0, ServiceDescriptor.Transient <IStartupFilter, MainBranchSetupFilter>());
}
public Startup(IConfiguration configuration, IWebHostEnvironment environment)
{
Configuration = configuration;
Environment = environment;
ApiStartup = new Api.Startup(Configuration, Environment, provideRazorTemplating: false);
UIOptions = new UIOptions();
}