Add project files.

FactoryPattern/Factories/DifferentImplementationsFactory.cs

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+using FactoryPattern.Samples;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FactoryPattern.Factories;
+
+
+public static class DifferentImplementationsFactoryExtension
+{
+    public static void AddVehicleFactory(this IServiceCollection services)
+    {
+        services.AddTransient<IVehicle, Car>();
+        services.AddTransient<IVehicle, Truck>();
+        services.AddTransient<IVehicle, Van>();
+        services.AddSingleton<Func<IEnumerable<IVehicle>>>
+            (x => () => x.GetService<IEnumerable<IVehicle>>()!);
+        services.AddSingleton<IVehicleFactory,VehicleFactory >();
+
+    }
+}
+
+public interface IVehicleFactory
+{
+    IVehicle Create(string name);
+}
+
+public class VehicleFactory : IVehicleFactory
+{
+    private readonly Func<IEnumerable<IVehicle>> _factory;
+
+    public VehicleFactory(Func<IEnumerable<IVehicle>> factory)
+    {
+        _factory = factory;
+    }
+
+    public IVehicle Create(string name)
+    {
+        var set = _factory();
+        IVehicle output = set.Where(x => x.VehicleType == name).First();
+        return output;
+    }
+}