[英]Replace service registration in ASP.NET Core built-in DI container?
[英]How to override and interface and call "base" interface in ASP.NET Core built-in DI container?
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。 我试过了:
// leads to infinite recursion death
services.AddScoped<IFoo>((sp) => new FooProxy(sp.GetRequiredService<IFoo>()));
并且:
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>()));
这是您可以使用装饰器模式实现的目标。
为此,有一个图书馆。
https://github.com/khillang/Scutor
service.AddScoped<IFoo,FooConcrete>(); // This I believe register by Third Party service.Decorate<IFoo,FooProxy>(); // This is you will add.
另一种不太好的方法。
public interface IFooProxy: IFoo { } public class FooProxy: IFooProxy { public FooProxy(IFoo foo) { } } // Configure Sevices services.AddScoped<IFooProxy,FooProxy>();
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