如何在ASP.NET 核心内置DI 容器中覆盖和调用"base" 接口？

Question

假设我有一个由 3pty 库注册到默认容器的接口

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

internal sealed class FooInternal : IFoo { ... }

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

我确实想覆盖 SayBye() 方法。我创建了一个 class

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

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

现在我面临的问题是如何将它连接到依赖注入。我试过：

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

还有：

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

这是你可以使用装饰器模式实现的。

为此，只有一个库。

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.

另一种方式有点不好

public interface IFooProxy: IFoo
{

}

public class FooProxy : IFooProxy
{
        public FooProxy(IFoo foo)
      {
      }
}

  // Configure Sevices
  services.AddScoped<IFooProxy,FooProxy>();

如何在ASP.NET 核心内置DI 容器中覆盖和调用"base" 接口？

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

c#

dependency-injection

.net-core

asp.net-core