ahmetkucukoglu

var products = new List<Product>
{
    new()
    {
        Title = "MacBook Pro 14 inch",
        Description = "It's now even more capable, thanks to the new M3 chip."
    },
    new()
    {
        Title = "MacBook Pro 16 inch",

ahmetkucukoglu

public class CsvProductsExporterAdapter : IProductsExporter
{
    private CsvHelper CsvHelper { get; set; }

    public CsvProductsExporterAdapter(CsvHelper csvHelper)
    {
        CsvHelper = csvHelper;
    }

    public string Export(List<Product> data)

ahmetkucukoglu

public class CsvHelper
{
    private char Delimiter { get; set; }

    public CsvHelper(char delimiter)
    {
        Delimiter = delimiter;
    }

    public string GenerateCsv(List<object> rows)

ahmetkucukoglu

public class JsonProductsExporter : IProductsExporter
{
    public string Export(List<Product> products)
    {
        return JsonSerializer.Serialize(products);
    }
}

ahmetkucukoglu

public class XmlProductsExporter : IProductsExporter
{
    public string Export(List<Product> products)
    {
        var xmlSerializer = new XmlSerializer(products.GetType());

        using var stringWriter = new StringWriter();
        using var xmlWriter = new XmlTextWriter(stringWriter) { Formatting = Formatting.Indented };
        xmlSerializer.Serialize(xmlWriter, products);

ahmetkucukoglu

public interface IProductsExporter
{
    string Export(List<Product> products);
}

ahmetkucukoglu

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder
        .Entity<Shipment>()
        .Property(e => e.State)
        .HasConversion(
            s => s.ToString(),
            s => s switch {
              nameof(OrderPlacedState) => new OrderPlacedState(),
              nameof(InTransitState) => new InTransitState(),

ahmetkucukoglu

var shipment = new Shipment(Guid.NewGuid(), "RU", "Istanbul")
shipment.ToInTransit();
shipment.ToInCustoms();
shipment.ToInCustomsCleared();
shipment.ToOutForDelivery();
shipment.ToNotDelivered();
shipment.ToDelivered();

ahmetkucukoglu

public class Shipment
{
    public Guid OrderId { get; private set; }
    public string FromCountry { get; private set; }
    public string To { get; private set; }
    public ShipmentState State { get; private set; }
    public int DeliveryAttempts { get; internal set; }

    public Shipment(Guid orderId, string fromCountry, string to)
    {

ahmetkucukoglu

public class NotDeliveredState : ShipmentState
{
    public override string ToString() => nameof(NotDeliveredState);
}