Runtime Aspect Loader feature

[nicewk]

Great job! It could be better if the Aspect attribute can add to the target automatically according to a config file.

[pamidur]

Hi! Thanks! I'm actually working on something like this. But the idea is not the config file but kinda fluent loader. So you'll be able to do something like:

var assembly = AspectLoader.Load(filename, loader => {
                loader.Inject(typeof(LogAspect)).IntoMethod(m => m.Attributes == MethodAttributes.Public);
            });

This might be useful if don't own target assembly. E.g. test loader or custom application loader/partcher.

If you instead own target assembly you can use Propagate feature like this:

    [Aspect(Scope.Global)]
    [Injection(typeof(LogAspect), Propagation = PropagateTo.Types | PropagateTo.Methods, PropagationFilter = "^MyMethod")]
    public class LogAspect : Attribute
    {
        [Advice(Kind.Before, Targets = Target.Method | Target.Public)]
        public void Log([Argument(Source.Name)] string method)
        {
            Console.WriteLine($"Entering {method}");
        }
    }

And then apply it to assembly

[assembly:LogAspect]

Let me know if it works for you, and how would you like it work otherwise. Your usage scenarios would be plus)

[nicewk]

Thanks @pamidur. That makes sense. I will try it.

[emisand]

@pamidur Is the AspectLoader or Propagation features already implemented? This is the kind of feature I need to apply aspects to classes that implement an interface from a framework I'm working on. I would need to implement some reflection filters to check if a method is within a class with some specific interfaces or attributes in order to apply the aspect.

[pamidur]

Hi @emisand , unfortunately AspectLoader is not ready (not even close to ready as there is some technical difficulties) There is another feature though that might be of some interest to you - Interface triggers which allows you to have some injection based on implemented interface - see here https://github.com/pamidur/aspect-injector/releases/tag/2.5.0