Using a custom modelbinder attribute to inject dependencies via IOC into ASP.NET MVC actions.

aspnetmvc-action-di-ioc.cs

public class ExampleController : Controller
{
	public ActionResult Register(UserRegistrationDTO dto, [Inject] ISession session, [Inject("THIS-IS-A-KEY")] UserCreateCommand command)
	{
		...
	}
}

public class IocMvcModelBinder : IModelBinder
{
	public IocMvcModelBinder()
	{
	}
	
	public IocMvcModelBinder(string key)
	{
		Key = key;
	}

	public string Key { get; protected set; }

	public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
	{
		return Key != null ?
			StaticIocContainer.Resolve(Key, bindingContext.ModelType) :
			StaticIocContainer.Resolve(bindingContext.ModelType);
	}
}

[AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false, Inherited = true)]
public sealed class InjectAttribute : CustomModelBinderAttribute
{
	public InjectAttribute(){}
	public InjectAttribute(string key)
	{
		Key = key;
	}
	public string Key { get; set; }

	public override IModelBinder GetBinder()
	{
		return new IocMvcModelBinder(Key);
	}
}