How to override and interface and call "base" interface in ASP.NET Core built-in DI container?

Question

Suppose I have an interface registered by 3pty library to the default container

// 3pty lib
public interface IFoo {
  SayHello();
  SayBye();
}

internal sealed class FooInternal : IFoo { ... }

public static WithFoo(this IServiceCollection serviceCollection) { 
  serviceCollection.AddScoped<IFoo, FooInternal>();
}

And I do want to overwrite the SayBye() method. I've created a class

class FooProxy : IFoo {
   private readonly IFoo baseFoo;
   public FooProxy(IFoo baseFoo) {
     this.baseFoo = baseFoo;
   }

   public void SayHello() { baseFoo.SayHello(); }
   public void SayBye() { ... }
}

Now the problem I'm facing is how to hook it up to dependency injection. I've tried:

// leads to infinite recursion death
services.AddScoped<IFoo>((sp) => new FooProxy(sp.GetRequiredService<IFoo>()));

And also:

public class FooProxy : IFoo {
  private readonly Func<IFoo> baseFoo;
  SayHello() { baseFoo().SayHello(); }
}

// leads to object disposed error 
services.AddScoped<IFoo>((sp) => new FooProxy(() => sp.GetRequiredService<IFoo>()));

Answer 1

This is something you can achieve using Decorator Pattern.

For this there is one library.

• https://github.com/khellang/Scrutor

   service.AddScoped<IFoo,FooConcrete>(); // This I believe register by Third Party service.Decorate<IFoo,FooProxy>(); // This is you will add.

• Another way which is bit not good.

   public interface IFooProxy: IFoo { } public class FooProxy: IFooProxy { public FooProxy(IFoo foo) { } } // Configure Sevices services.AddScoped<IFooProxy,FooProxy>();