Remove a service in ASP.Net Core Dependency Injection [duplicate]

Question

In an Asp.Net MVC Core (early versions, versions 1.0 or 1.1), dependency injection bindings are configured as follow in the Startup.cs class :

public class Startup {     public void ConfigureServices(IServiceCollection services)     {         services.AddScoped<IMyService, MyService>();         // ...     } } 

In my applications, I usually have a base Startup class, where generic bindings are defined as a sequence of these lines :

public abstract class BaseStartup {     public virtual void ConfigureServices(IServiceCollection services)     {         services.AddScoped<IMyService1, MyService1>();         services.AddScoped<IMyService2, MyService2>();     } } 

Then in my application, I inherit the startup class, and inject other services as well :

public class Startup : BaseStartup {     public override void ConfigureServices(IServiceCollection services)     {         base.ConfigureServices(services);          services.AddScoped<IMyService3, MyService3>();         services.AddScoped<IMyService4, MyService4>();     } } 

I now wonder : how can I kind of 'override' a previous binding ? I would like, for instance, to either remove, or modify a binding defined in the base class, like :

services.Remove<IMyService1>(); // Doesn't exist services.AddScoped<IMyService1, MyBetterService1>(); 

Or simply update the binding :

services.AddScoped<IMyService1, MyBetterService1>(replacePreviousBinding: true); // Doesn't exist either ! 

Is there a way to do that ? Or maybe simply declaring a new binding with the same interface as a previously defined binding will override that binding ?

Answer 1

You can use normal collection API to remove your services:

services.AddScoped<IService>();  var serviceDescriptor = services.FirstOrDefault(descriptor => descriptor.ServiceType == typeof(IService)); services.Remove(serviceDescriptor); 

Also you can create extension methods to achieve the same:

public static class ServiceCollectionExtensions {     public static IServiceCollection Remove<T>(this IServiceCollection services)     {         if (services.IsReadOnly)         {             throw new ReadOnlyException($"{nameof(services)} is read only");         }          var serviceDescriptor = services.FirstOrDefault(descriptor => descriptor.ServiceType == typeof(T));         if (serviceDescriptor != null) services.Remove(serviceDescriptor);          return services;     } }