Bailey Ling's Memeber Injection Attribute

[Adam Hill]

Has anyone / can anyone, port Bailey Ling's Memeber Injection Attribute - http://bling.github.io/blog/2009/09/07/member-injection-module-for-autofac/ to the current verson of Autofac?

The Module API has changed significantly enough that I have no idea where to begin.

Thanks.

[Kaleb Pederson]

VPN has been down today for me... so you're in luck, assuming I understand your request:

Here's the code:

public class MemberInjectionModule : Module

{

protected override void AttachToComponentRegistration(IComponentRegistry registry, IComponentRegistration registration)

{

registration.Activated += OnComponentActivated;

}

private void OnComponentActivated(object sender, ActivatedEventArgs<object> e)

{

const BindingFlags flags = BindingFlags.Instance |

  BindingFlags.NonPublic |

  BindingFlags.Public;

var type = e.Instance.GetType();

foreach (var field in type.GetFields(flags))

{

if (field.GetCustomAttributes(typeof(InjectedAttribute), true).Length > 0)

field.SetValue(e.Instance, e.Context.Resolve(field.FieldType));

}

foreach (var prop in type.GetProperties(flags))

{

if (prop.GetCustomAttributes(typeof(InjectedAttribute), true).Length > 0)

{

if (prop.GetIndexParameters().Length > 0)

throw new InvalidOperationException("Indexed properties cannot be injected.");

prop.SetValue(e.Instance, e.Context.Resolve(prop.PropertyType), null);

}

}

}

}

[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]

public class InjectedAttribute : Attribute { }

And here's a simple unit test:

public class SampleClass

{

[Injected]

public IOther InjectedOther { get; set; }

public IOther NotInjectedOther { get; set; }

}

[Test]

public void MemberInjectionModule_checks_InjectedAttribute_and_injects_dependency()

{

var builder = new ContainerBuilder();

builder.RegisterModule<MemberInjectionModule>();

builder.RegisterType<Other1>().As<IOther>();

builder.RegisterType<SampleClass>();

var container = builder.Build();

var resolved = container.Resolve<SampleClass>();

Assert.That(resolved.InjectedOther, Is.Not.Null);

Assert.That(resolved.NotInjectedOther, Is.Null);

}

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