Code Based Configuration IOC

[sboulay]

Does anyone know when the "code based configuration" will be available? We would rather not use xml files for declaring our dependencies. Also, does anybody know if it will target .net 2.0?

[kibbled_bits]

They are about to release Spring 2.0 which allows for attribute based injection which is very slick, even easier than a fluent configuration. I dunno what the ETA on Spring 2.0 is but I've been expecting it any day for about a month ;-).

Erich did a nice blog post on Spring.Net with code config: http://eeichinger.blogspot.com/2009/...t-for-net.html. Also there is a project out there called Recoil: http://code.google.com/p/spring-recoil/ which gives you fluent configuration of Spring.

[Nuno Ferreira]

Hi All,

I'm new to this forum and I was here recently trying to find an answer for how to use Attribute based configuration for setting up my spring container.

In my lack of luck in finding good examples of how I would do this in Spring.net I created the following scanner that together with CodeConfigApplicationContext does the trick:

using System;
using Spring.Context.Attributes;
using Spring.Objects.Factory.Support;
using Spring.Stereotype;

namespace AttributeBasedSpringConfig
{
    public class AttributeBasedObjectDefinitionScanner : AssemblyObjectDefinitionScanner
    {
        protected override bool IsCompoundPredicateSatisfiedBy(Type type)
        {
            var attribute = Attribute.GetCustomAttribute(type, typeof(ComponentAttribute), true);
            if (attribute != null)
            {
                return true;
            }
            return base.IsCompoundPredicateSatisfiedBy(type);
        }

        public override void ScanAndRegisterTypes(IObjectDefinitionRegistry registry)
        {
            
            IEnumerable<Type> configTypes = base.Scan();

            //if we have at least one config class, ensure the post-processor is registered
            if (configTypes.Any())
            {
                AttributeConfigUtils.RegisterAttributeConfigProcessors(registry);
            }

            foreach (Type type in configTypes)
            {
                ObjectDefinitionBuilder definition = ObjectDefinitionBuilder.GenericObjectDefinition(type);

                registry.RegisterObjectDefinition(GetObjectRegistryName(definition.ObjectDefinition),
                                                  definition.ObjectDefinition);
            }
        }

        private string GetObjectRegistryName(AbstractObjectDefinition objectDefinition)
        {
            var attribute = Attribute.GetCustomAttribute(objectDefinition.ObjectType, typeof (ComponentAttribute), true);

            if (attribute != null)
            {
                var componentName = ((ComponentAttribute) attribute).Name;
                if (!String.IsNullOrWhiteSpace(componentName))
                {
                    return componentName;
                }
            }

            return objectDefinition.ObjectTypeName;
        }
    }
}

You can find a full example with explanation on how I did it in my blog post: Spring.net Attribute Based Configuration

P.S. I'm new to C# (almost 1 month exp) so please forgive me if I'm offending the good practices within the language.