IServiceCollection override a single constructor argument

Question

I have a class that takes three constructor arguments. In my composition root I want to define/override only one of the three constructor arguments; the oth

Answer 1

Example:
Service Cons.:

public SkillsService(IRepositoryBase<FeatureCategory> repositoryCategory, int categoryId)

Startup:

 services.AddScoped<ISkillsService>(i => new SkillsService(services.BuildServiceProvider().GetService<IRepositoryBase<FeatureCategory>>(), AppSettingsFeatures.Skills));

Answer 2

Try this:

services.AddTransient<IDependency2, Dependency2Impl>();

services.AddTransient<IDependency3, Dependency3Impl>();

services.AddTransient<IMyInterface>(provider=>
    return new MyClass("constructor argument value",
      provider.GetService<IDependency2>(),
      provider.GetService<IDependency3>());
);

Answer 3

For anyone who wants a generic but flexible solution: https://gist.github.com/ReallyLiri/c669c60db2109554d5ce47e03613a7a9

The API is

public static void AddSingletonWithConstructorParams<TService, TImplementation>(
            this IServiceCollection services,
            object paramsWithNames
        );
public static void AddSingletonWithConstructorParams(
            this IServiceCollection services,
            Type serviceType,
            Type implementationType,
            object paramsWithNames
        );
public static void AddSingletonWithConstructorParams<TService, TImplementation>(
            this IServiceCollection services,
            params object[] parameters
        );
public static void AddSingletonWithConstructorParams(
            this IServiceCollection services,
            Type serviceType,
            Type implementationType,
            params object[] parameters
        );

Implemented with constructor method reflection.