parr_api/PARR.DAL/ParrDalInstaller.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using PARR.DAL.Context;

namespace PARR.DAL
{
    public static class ParrDalInstaller
    {
        public static void InstallDalServices(this IServiceCollection services, IConfiguration configuration)
        {
            services.AddDbContext<DataContext>(opt =>
              opt.UseNpgsql(configuration.GetConnectionString("DefaultConnection"))
          );

            //services.AddTransient<ILayerService, LayerService>();
            //services.AddTransient<IUsersInLayersService, UsersInLayersService>();
            //services.AddTransient<IAreaService, AreaService>();
            //services.AddTransient<IAreasInLayerService, AreasInLayerService>();
        }
    }
}