/// <summary>
/// Callback invoked to set per-controller overrides for this controllerDescriptor.
/// </summary>
/// <param name="controllerSettings">The controller settings to initialize.</param>
/// <param name="controllerDescriptor">The controller descriptor. Note that the
/// <see cref="System.Web.Http.Controllers.HttpControllerDescriptor"/> can be
/// associated with the derived controller type given that <see cref="System.Web.Http.Controllers.IControllerConfiguration"/>
/// is inherited.</param>
/// <exception cref="System.ArgumentNullException">
/// Thrown if <paramref name="controllerSettings" /> or <paramref name="controllerDescriptor" /> is <see langword="null" />.
/// </exception>
public void Initialize(HttpControllerSettings controllerSettings, HttpControllerDescriptor controllerDescriptor)
{
if (controllerSettings == null)
{
throw new ArgumentNullException(nameof(controllerSettings));
}
if (controllerDescriptor == null)
{
throw new ArgumentNullException(nameof(controllerDescriptor));
}
if (controllerDescriptor.Configuration == null)
{
return;
}
if (!controllerDescriptor.Properties.TryAdd(InitializedKey, null))
{
return;
}
var container = controllerDescriptor.Configuration.DependencyResolver.GetRootLifetimeScope();
if (container == null)
{
throw new InvalidOperationException(
string.Format(
CultureInfo.CurrentCulture,
AutofacControllerConfigurationAttributeResources.DependencyResolverMissing,
typeof(AutofacWebApiDependencyResolver).Name,
typeof(AutofacControllerConfigurationAttribute).Name));
}
var controllerServices = controllerSettings.Services;
var serviceKey = new ControllerTypeKey(controllerDescriptor.ControllerType);
UpdateControllerService <IHttpActionInvoker>(controllerServices, container, serviceKey);
UpdateControllerService <IHttpActionSelector>(controllerServices, container, serviceKey);
UpdateControllerService <IActionValueBinder>(controllerServices, container, serviceKey);
UpdateControllerService <IBodyModelValidator>(controllerServices, container, serviceKey);
UpdateControllerService <IContentNegotiator>(controllerServices, container, serviceKey);
UpdateControllerService <IHttpControllerActivator>(controllerServices, container, serviceKey);
UpdateControllerService <ModelMetadataProvider>(controllerServices, container, serviceKey);
UpdateControllerServices <ModelBinderProvider>(controllerServices, container, serviceKey);
UpdateControllerServices <ModelValidatorProvider>(controllerServices, container, serviceKey);
UpdateControllerServices <ValueProviderFactory>(controllerServices, container, serviceKey);
UpdateControllerFormatters(controllerSettings.Formatters, container, serviceKey);
}
static void UpdateControllerService <T>(ServicesContainer services, IComponentContext container, ControllerTypeKey serviceKey) where T : class
{
var instance = container.ResolveOptionalKeyed <Meta <T> >(serviceKey);
var baseControllerType = serviceKey.ControllerType.BaseType;
while (instance == null && baseControllerType != typeof(ApiController))
{
var baseServiceKey = new ControllerTypeKey(baseControllerType);
instance = container.ResolveOptionalKeyed <Meta <T> >(baseServiceKey);
baseControllerType = baseServiceKey.ControllerType.BaseType;
}
if (instance != null)
{
services.Replace(typeof(T), instance.Value);
}
}
private static void UpdateControllerFormatters(ICollection <MediaTypeFormatter> collection, IComponentContext container, ControllerTypeKey serviceKey)
{
var formatters = container.ResolveOptionalKeyed <IEnumerable <Meta <MediaTypeFormatter> > >(serviceKey).ToArray();
if (formatters.Any(service => ClearExistingServices(service.Metadata)))
{
collection.Clear();
}
foreach (var formatter in formatters)
{
collection.Add(formatter.Value);
}
}
private static void UpdateControllerServices <T>(ServicesContainer services, IComponentContext container, ControllerTypeKey serviceKey)
where T : class
{
var resolvedInstances = container.ResolveOptionalKeyed <IEnumerable <Meta <T> > >(serviceKey).ToArray();
if (resolvedInstances.Any(service => ClearExistingServices(service.Metadata)))
{
services.Clear(typeof(T));
}
foreach (var instance in resolvedInstances)
{
services.Add(typeof(T), instance.Value);
}
}