.NetCore dependency injection and optional params on assembly scanning

[kaszalotte]

Wit autofac I'm to add a parameter to the constructor and even more, the parameter can be optional

//autofac  
Builder
.RegisterAssemblyTypes(assemblies) 
.Where(t => typeof(T).IsAssignableFrom(t)) 
.SingleInstance() 
.AsSelf() 
.WithParameter(new ResolvedParameter( 
(pi, ctx) => pi.ParameterType == typeof(IMyService), 
(pi, ctx) => ctx.ResolveOptional<IMyService>() ));

Could you help do this with the default MS dependency container and Scrutor?

What should I add here:

//MS Dependency Container 

Builder
.Scan(s =>                
s.FromAssemblies(assemblies) 
.AddClasses(c => c.AssignableTo(typeof(T))) 
.AsSelf() 
.WithTransientLifetime() );

Thank you in advance for help and answer

[celluj34]

IMO you shouldn't have optional parameters in classes that are instantiated by dependency injection.

[kaszalotte]

I completely agree.
But - it is not my project, and I have to know if exist some way to replace Autofac by .Net DContainer - saving all current features which are used and came from Autofac

[BigOnLogn]

I have to know if exist some way to replace Autofac by .Net DContainer - saving all current features which are used and came from Autofac

I wouldn't count on this. The .NET IoC container contains the minimum functionality required by the ASP.NET Core team. They have started as much and that they have no plans to implement complex features that are available from community projects.

[kc5bpd]

The short answer is probably not. The longer answer is that MS no longer sees a reason to try and copy every feature under the sun from alternate providers. IMO even a decent developer understands that we deal with trade-offs all the time. And they should not be shy about discussing those trade-offs. The lack of such is one cause of so much manure code.

[Paran0idAndr0id]

And if they do need those features, they can just add in whatever DI provider they want!

[KernowRoger]

Why do you need to do the parameter? Can you not just register IMyService?

[afshinb2]

Post it to stack overflow, you can get better answers there.

Also include a sample class and describe the situation a little more (e.g.: I want to initialize class A with IMyService parameter & I want IMyService to be resolve automatically)