U2U.AspNetCore.CleanArchitecture 2.0.0-alpha

U2U.AspNetCore.CleanArchitecture

This package makes it easier keep dependencies between Infrastructure and Web Site projects seperate, as described in Clean Architecture.

Usage

In your Infrastructure project you create a DependencyInjection class with extension methods that add needed dependencies, attributed with [AutoConfig]

[AutoConfig]
public static class DependencyInjection
{
  [AutoConfig]
  public static IServiceCollection AddCurrencyConverter(this IServiceCollection services)
  => services.AddTransient<ICurrencyConverterService, CurrencyConverterService>();

  [AutoConfig("GamesDb")]
  public static IServiceCollection AddGamesDb(this IServiceCollection services, string connectionString, [MigrationAssembly] string migrationAssembly)
    => services.AddDbContext<GamesDb>(optionsBuilder =>
         optionsBuilder.UseSqlServer(connectionString,
           sqlServerOptions => sqlServerOptions.MigrationsAssembly(migrationAssembly)));

In your Web Site project you call the AddAutoConfig method, passing in the Configuration instance.

services.AddAutoConfig(Configuration);

This method will look the the Infrastructure project for AutoConfig methods and call them.

Configuration

So how does AddAutoConfig know where to look for AutoConfig methods?

Your project should have an AutoConfig section, containing a list of assemblies to search, and the MigrationAssembly name for EF Migrations. For example:

  "AutoConfig": {
    "Assemblies": [
      "Infra"
    ],
    "MigrationAssembly":"WebApp"
  }

EF Migrations

When working with EF Core migrations you need to specify two things. First of all the name of the MigrationsAssembly, which can be found in configuration. But you also need to specify the connection string for each DbContext. If your Infrastructure project calls AddDbContext<T> how does it access configuration? The AutoConfig attribute has an overload, allowing you to specify the name of the connection string. The AddAutoConfig method will then lookup the value of the connection string and pass it to the method as the connectionString argument.

[AutoConfig("GamesDb")]
public static IServiceCollection AddGamesDb(this IServiceCollection services, string connectionString, [MigrationAssembly] string migrationAssembly)
  => services.AddDbContext<GamesDb>(optionsBuilder =>
       optionsBuilder.UseSqlServer(connectionString,
         sqlServerOptions => sqlServerOptions.MigrationsAssembly(migrationAssembly)));