Как я могу использовать EF 6 в проекте библиотеки классов .net framework внутри проекта API dot net core 3?

Question

Я добавил новый проект API, использующий ядро ​​dot net 3, и у меня уже есть проект библиотеки классов, использующий стандартную структуру dot net. Сначала он содержит базу данных BAL + EF. Проблема в том, что я хочу вызывать функции из BAL, и строка соединения с БД должна передаваться из проекта API в проект BAL.

Запуск API:

public Startup(IConfiguration configuration)
{
    Configuration = configuration;
}

public IConfiguration Configuration { get; }

// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
    //string connectionString = Configuration.GetConnectionString("CoreContext");
    //services.AddDbContextPool<DbContext>(options => options.UseSqlServer(connectionString));

    services.AddScoped<CoreContext>(_ => new CoreContext(Configuration.GetConnectionString("CoreContext")));

    string authorityURL = this.Configuration.GetValue<string>("AuthorityServer:URL");
    string ApiName = this.Configuration.GetValue<string>("AuthorityServer:ResourceName");

    services.AddAuthentication(options =>
    {
        options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
        options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
        }).AddIdentityServerAuthentication(o =>
    {
            o.Authority = authorityURL;
            o.ApiName = ApiName;
            o.ApiSecret = "xretail";
            o.RequireHttpsMetadata = false;

    });

    services.AddAuthorization();
    services.AddControllers();
}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    app.UseAuthentication();

    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }

    app.UseHttpsRedirection();

    app.UseRouting();

    app.UseAuthorization();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllers();
    });

    //using (var serviceScope = app.ApplicationServices.GetRequiredService<IServiceScopeFactory>().CreateScope())
    //{
    //    serviceScope.ServiceProvider.GetService<DbContext>().Database.Migrate();
    //}
}

И контроллер API

[Route("api/[controller]")]
[ApiController]
public class ShoutsController : ControllerBase
{
private readonly IConfiguration Configuration;
public ShoutsController(IConfiguration config)
{
    Configuration = config;
}

[HttpGet]
[Authorize]
public IActionResult Get()
{
    using (var customerBL = new CustomerBL(new XRetail.Core.BL.DataAccess.CoreContext(Configuration.GetConnectionString("CoreContext"))))
    {
        var username = User.Claims.First(x => x.Type == "email").Value;
        var customer = customerBL.GetCustomers()/*.FirstOrDefault(x => x.Email == username)*/;
        if (customer == null)
        {
            return NotFound();
        }
        return Ok(customer);
    }
}
}

Затем я создал частичный контекст

public partial class CoreContext
{
    public CoreContext(String ConnectionString) : base(ConnectionString)
    {
        Interlocked.Increment(ref NoOfConexts);
    }
}

public partial class CoreContextFactory : IDbContextFactory<CoreContext>
{
    public CoreContext Create()
    {
        return new CoreContext("metadata=res://*/DataAccess.CoreContext.csdl|res://*/DataAccess.CoreContext.ssdl|res://*/DataAccess.CoreContext.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=192.168.1.221;initial catalog=XRetail-PartnerMerge-v1.0;persist security info=True;user id=xretail_admin;password=Xretail@4321;MultipleActiveResultSets=True;App=gabr&quot;");
    }
}

И использовал внутри конструктора Customer

public CustomerBL(CoreContext context)
{
    Context = context;
}