Demostrates unexpected decorator behaviour in Auto 4.4.0

decorators.cs

	// Suitable for LINQPad with the Autofac nuget package
  
  void Main()
	{
		ExpectedBehaviour();
		UnexpectedBehaviour();
	}
	
	public void ExpectedBehaviour()
	{
		var builder = new ContainerBuilder();
		builder.RegisterType<FooOne>().As<IFoo>();
		// replaces default IFoo implementation
		builder.RegisterType<FooTwo>().As<IFoo>();
		var container = builder.Build();
		Console.WriteLine(container.Resolve<IFoo>().Execute());
	}
	
	public void UnexpectedBehaviour()
	{
		var builder = new ContainerBuilder();
		// comment next line to get working decorator
		builder.RegisterType<FooOne>().As<IFoo>();
		builder.RegisterType<FooOne>().Named<IFoo>("foo");
		// default IFoo implementation is not replaced
		builder.RegisterDecorator<IFoo>((c, inner) => new DecoratorFoo(inner), fromKey: "foo");
		var container = builder.Build();
		Console.WriteLine(container.Resolve<IFoo>().Execute());
	}
	
	public interface IFoo
	{
		string Execute();
	}
	
	// Define other methods and classes here
	public class FooOne : IFoo
	{
		public string Execute() => "FooOne.Execute";
	}
	
	public class FooTwo : IFoo
	{
		public string Execute() => "FooTwo.Execute";
	}
	
	public class DecoratorFoo : IFoo
	{
		private IFoo inner;
		
		public DecoratorFoo(IFoo inner)
		{
			this.inner = inner;
		}
		
		public string Execute() => "Decorated " + inner.Execute();
	}