Simple factory design pattern in C#

SimpleFactory.cs

using System.Text.Json;

// Client Code
public static class Program {
    public static void Main(string[] args) {
        // Sample Data
        var people = new List<Person> {
            new("John", "Doe"),
            new("Jane", "Smith"),
            new("Alice", "Johnson")
        };

        Console.Write("Enter export format (json, text): ");
        var format = Console.ReadLine();

        // Use the factory to create the appropriate exporter
        var exporter = DataExporterFactory.CreateExporter(format);

        // Export the data
        var result = exporter.Export(people);
        Console.WriteLine(result);
    }
}

// Define the Exporter Interface
public interface IDataExporter {
    string Export(List<Person> people);
}

//Implement Concrete Exporters

// JSON Exporter
public class JsonDataExporter : IDataExporter {
    public string Export(List<Person> people) =>
        JsonSerializer.Serialize(people, new JsonSerializerOptions { WriteIndented = true });
}

// Text Exporter
public class TextDataExporter : IDataExporter {
    public string Export(List<Person> people) =>
        string.Join(Environment.NewLine, people);
}

// Create the Factory Class
public static class DataExporterFactory {
    public static IDataExporter CreateExporter(string? format) {
        if (string.IsNullOrWhiteSpace(format)) throw new ArgumentNullException(nameof(format));

        return format.ToLower() switch {
            "json" => new JsonDataExporter(),
            "text" => new TextDataExporter(),
            _ => throw new ArgumentException("Unsupported export format.")
        };
    }
}

// Define the Person Record
public record Person(string Name, string Family) {
    public override string ToString() {
        return $"{Name} {Family}";
    }
}