C# 具有通用接口和参数的 DI

Question

Given a generic interface and its implementation:

public interface IGenericInterface<T> { ... }

public class GenericImplementation<T> : IGenericInterface<T> { ... }

I am registering this for DI using services.AddTransient(typeof(IGenericInterface<>), typeof(GenericImplementation<>));

This works fine, of course. But I would like to inject a setting/config from the appsettings.json , which is where I'm coming unstuck.

Usually, I'd register my dependencies with parameters using services.AddTransient<IInterface>(x => new Implementation(x.GetRequiredService<IDependency>(), configuration["SomeSetting"]);

Is it possible to pass parameters to a dependency when registering it by type ?

Answer 1

You should make use of the Options Pattern.

You need to bind the config to a class and register the class for DI. Then in the constructor for the class that needs the config, you pass it in via the constructor.

Documentation Here:

https://learn.microsoft.com/en-us/as.net/core/fundamentals/configuration/options?view=as.netcore-6.0

Answer 2

You should be injecting your configuration class into your other dependencies' classes, and let them pick out what they want. What you're doing is breaking that separation of concerns.