Lamar v0.9 — Decorators and “MVP” – The Shade Tree Developer

Lamar, which started life as “BlueMilk,” is the now permanent codename for my next generation IoC tool that is meant to replace StructureMap in new .Net Core projects. I did a little bit of work this morning to add in at least the basic functionality for decorators similar to what StructureMap has supported since 3.0 (but no other kinds of interception for now):

[Fact]
public void decorator_example()
{
    var container = new Container(_ =>
    {
        // This usage adds the WidgetHolder as a decorator
        // on all IWidget registrations
        _.For<IWidget>().DecorateAllWith<WidgetHolder>();
        
        // The AWidget type will be decorated w/ 
        // WidgetHolder when you resolve it from the container
        _.For<IWidget>().Use<AWidget>();
        
        _.For<IThing>().Use<Thing>();
    });

    // Just proving that it actually works;)
    container.GetInstance<IWidget>()
        .ShouldBeOfType<WidgetHolder>()
        .Inner.ShouldBeOfType<AWidget>();
}

This change, and a few other miscellaneous fixes for integration with Jasper, are available on Nuget in Lamar 0.9.0. At this point, I feel like Lamar is already at the feature set I intend to support for a 1.0 release. It’s going to at least go through some load testing at my work over the next month, and still lacks documentation (but most of it behaves identically to StructureMap or the ASP.Net Core DI compliance). All the same, I’m declaring it ready for real usage if anybody is up for trying it out and hopefully sharing any feedback. It should *mostly* be a drop in replacement for StructureMap if you’re not doing too much weird stuff.

For more information, see some of my previous blog posts about Lamar/BlueMilk: