Add project files.

FactoryPattern/Factories/AbstractFactory.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FactoryPattern.Factories;
+//builder.Services.AddTransient<ISample1, Sample1>();
+//builder.Services.AddSingleton<Func<ISample1>>(x => () => x.GetService<ISample1>());
+
+public static class AbstractFactoryExtension
+{
+    public static void AddAbstractFactory<TInterface, TImplementation>(this IServiceCollection services)
+    where TInterface : class
+    where TImplementation : class, TInterface
+    {
+        services.AddTransient<TInterface, TImplementation>();
+        services.AddSingleton<Func<TInterface>>(x => () => x.GetService<TInterface>()!);
+        services.AddSingleton<IAbstractFactory<TInterface>, AbstractFactory<TInterface>>();
+    }
+}
+
+public class AbstractFactory<T> : IAbstractFactory<T>
+{
+    private readonly Func<T> _factory;
+
+    public AbstractFactory(Func<T> factory)
+    {
+        _factory = factory;
+    }
+
+    public T Create()
+    {
+        return _factory();
+    }
+}
+
+public interface IAbstractFactory<T>
+{
+    T Create();
+}