Why should you care?

ShopNest notifications switch Email vs Sms without if-else sprinkled in every controller.

See it live — copy this example

Paste into a C# console or class library project and run dotnet run.

public interface INotifier { void Send(string to, string body); }
public sealed class EmailNotifier : INotifier
{
    public void Send(string to, string body) => Console.WriteLine($"EMAIL {to}: {body}");
}
public sealed class SmsNotifier : INotifier
{
    public void Send(string to, string body) => Console.WriteLine($"SMS {to}: {body}");
}
public static class NotifierFactory
{
    public static INotifier Create(string channel) => channel switch
    {
        "sms" => new SmsNotifier(),
        _ => new EmailNotifier()
    };
}

NotifierFactory.Create("sms").Send("99999", "Order shipped");

Run Example »

Edit the code below and click Run to see the result in Toolliyo’s live editor.

What happened?

• Create returns INotifier.
• Callers never new the concrete types.
• A true GoF Factory Method often lives on a Creator subclass; this compact form shows the same idea.

Practice next

1. Run the sample and try channel email vs sms.
2. Add PushNotifier for channel push.
3. Inject a Func via DI later.
4. Throw on unknown channel instead of defaulting.
5. Pass options into Create (from-address).

Remember

Create via abstraction. Centralize construction choices. Call sites stay clean.

ShopNest notify channel factory

Order events pick Email/Sms from customer preference.

Outcome: New channels plug in without editing OrderService.