c# - DependencyInjection 是否支持自动注册服务？

Question

ASP.Net Core 内置的依赖注入(inject)功能是否支持自动注册服务？我不想像这样手动注册它们:

services.Add(new ServiceDescriptor(typeof(IUserService), 
                   new UserService(new AtmDbContext())));

Answer 1

对于我的项目，以下内容帮助了我:

在 Startup.cs 方法 ConfigureServices 添加行:

services.AddHandlers("Project name");

及其实现:

public static IServiceCollection AddHandlers(this IServiceCollection services, string assemblyName)
{
      var assemblyPath = Path.Combine(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location), assemblyName + ".dll");
      var assembly = Assembly.Load(AssemblyLoadContext.GetAssemblyName(assemblyPath));

      var classTypes = assembly.ExportedTypes.Select(t => IntrospectionExtensions.GetTypeInfo(t)).Where(t => t.IsClass && !t.IsAbstract);

      foreach (var type in classTypes)
      {
          var interfaces = type.ImplementedInterfaces.Select(i => i.GetTypeInfo());

          foreach (var handlerType in interfaces.Where(i => i.IsGenericType))
          {
               services.AddTransient(handlerType.AsType(), type.AsType());
          }
      }

      return services;
}