// Note that the 'implementationType' could in fact be a service type as well and it is allowed
// for the implementationType to equal TService. This will happen when someone does the following:
// container.Collections.Register<ILogger>(typeof(ILogger));
private InstanceProducer GetOrCreateInstanceProducer(Type implementationType)
{
// If the implementationType is explicitly registered (using a Register call) we select this
// producer (but we skip any implicit registrations or anything that is assignable, since
// there could be more than one and it would be unclear which one to pick).
InstanceProducer producer = this.GetExplicitRegisteredInstanceProducer(implementationType);
// If that doesn't result in a producer, we request a registration using unregistered type
// resolution, were we prevent concrete types from being created by the container, since
// the creation of concrete type would 'pollute' the list of registrations, and might result
// in two registrations (since below we need to create a new instance producer out of it),
// and that might cause duplicate diagnostic warnings.
if (producer == null)
{
producer = this.GetInstanceProducerThroughUnregisteredTypeResolution(implementationType);
}
// If that still hasn't resulted in a producer, we create a new producer and return (or throw
// an exception in case the implementation type is not a concrete type).
if (producer == null)
{
return(this.CreateNewExternalProducer(implementationType));
}
// If there is such a producer registered we return a new one with the service type.
// This producer will be automatically registered as external producer.
if (producer.ServiceType == typeof(TService))
{
return(producer);
}
return(new InstanceProducer(typeof(TService),
new ExpressionRegistration(producer.BuildExpression(), this.container)));
}
// This extension method is equivalent to the following registration, for each and every T:
// container.Register<Lazy<T>>(() => new Lazy<T>(() => container.GetInstance<T>()));
// This is useful for consumers that have a dependency on a service that is expensive to create, but
// not always needed.
// This mimics the behavior of Autofac and Ninject 3. In Autofac this behavior is default.
public static void AllowResolvingLazyFactories(this Container container)
{
container.ResolveUnregisteredType += (sender, e) =>
{
if (e.UnregisteredServiceType.IsGenericType &&
e.UnregisteredServiceType.GetGenericTypeDefinition() == typeof(Lazy <>))
{
Type serviceType = e.UnregisteredServiceType.GetGenericArguments()[0];
InstanceProducer registration = container.GetRegistration(serviceType, true);
Type funcType = typeof(Func <>).MakeGenericType(serviceType);
Type lazyType = typeof(Lazy <>).MakeGenericType(serviceType);
var factoryDelegate =
Expression.Lambda(funcType, registration.BuildExpression()).Compile();
var lazyConstructor = (
from ctor in lazyType.GetConstructors()
where ctor.GetParameters().Length == 1
where ctor.GetParameters()[0].ParameterType == funcType
select ctor)
.Single();
e.Register(Expression.New(lazyConstructor, Expression.Constant(factoryDelegate)));
}
};
}
private static void _resolvingLazyServicesHandler(object sender, UnregisteredTypeEventArgs e)
{
var type = e.UnregisteredServiceType;
var container = sender as Container;
if (!type.IsGenericType ||
type.GetGenericTypeDefinition() != typeof(Lazy <>))
{
return;
}
Type serviceType = type.GetGenericArguments().First();
InstanceProducer registration = container
.GetRegistration(serviceType, true);
registration.Registration.SuppressDiagnosticWarning(DiagnosticType.DisposableTransientComponent, "Ignored during automatic Lazy Registration");
Type funcType =
typeof(Func <>).MakeGenericType(serviceType);
Type lazyType =
typeof(Lazy <>).MakeGenericType(serviceType);
var funcExpression = Expression.Lambda(funcType,
registration.BuildExpression());
var lazyDelegate = Expression.Lambda(lazyType,
Expression.New(lazyType.GetConstructor(new[] { funcType }), funcExpression)).Compile();
e.Register(Expression.Constant(lazyDelegate));
}
public static void AllowResolvingFuncFactories(this ContainerOptions options)
{
options.Container.ResolveUnregisteredType += (s, e) =>
{
var type = e.UnregisteredServiceType;
if (!type.IsGenericType || type.GetGenericTypeDefinition() != typeof(Func <>))
{
return;
}
Type serviceType = type.GetGenericArguments().First();
InstanceProducer registration = null;
try
{
registration = options.Container.GetRegistration(serviceType, true);
}
catch (ActivationException)
{
serviceType = serviceType.GetInterfaces().FirstOrDefault();
registration = options.Container.GetRegistration(serviceType, true);
}
Type funcType = typeof(Func <>).MakeGenericType(serviceType);
var factoryDelegate = Expression.Lambda(funcType, registration.BuildExpression()).Compile();
e.Register(Expression.Constant(factoryDelegate));
};
}
private static void _resolvingFuncFactoriesHandler(object sender, UnregisteredTypeEventArgs e)
{
var type = e.UnregisteredServiceType;
var container = sender as Container;
if (!type.IsGenericType ||
type.GetGenericTypeDefinition() != typeof(Func <>))
{
return;
}
Type serviceType = type.GetGenericArguments().First();
InstanceProducer producer = container
.GetRegistration(serviceType, true);
producer.Registration.SuppressDiagnosticWarning(DiagnosticType.DisposableTransientComponent, "Ignored during automatic Func Registration");
Type funcType =
typeof(Func <>).MakeGenericType(serviceType);
var factoryDelegate = Expression.Lambda(funcType,
producer.BuildExpression()).Compile();
var registration = Lifestyle.Singleton.CreateRegistration(funcType, () => factoryDelegate, (Container)sender);
e.Register(registration);
}
/// <summary>
/// Creates a <see cref="SimpleInjectorServiceHost"/> for a specified type of service with a specific
/// base address.
/// </summary>
/// <returns>
/// A <see cref="SimpleInjectorServiceHost"/> for the type of service specified with a specific base
/// address.
/// </returns>
/// <param name="serviceType">
/// Specifies the type of service to host.
/// </param>
/// <param name="baseAddresses">
/// The <see cref="T:System.Array"/> of type <see cref="T:System.Uri"/> that contains the base
/// addresses for the service hosted.
/// </param>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="serviceType"/> is a null
/// reference.</exception>
protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
{
Requires.IsNotNull(serviceType, nameof(serviceType));
if (container == null)
{
throw new InvalidOperationException("The operation failed. Please call the " +
typeof(SimpleInjectorServiceHostFactory).FullName + ".SetContainer(Container) method " +
"supplying the application's " + typeof(Container).FullName + " instance during " +
"application startup (for instance inside the Application_Start event of the Global.asax). " +
"In case you're running on non-HTTP protocols such as net.tcp and net.pipe that is " +
"supported by the Windows Activation Service (WAS), please see the WCF integration " +
"documentation: https://simpleinjector.org/wcf.");
}
InstanceProducer producer = container.GetRegistration(serviceType, true);
// Force building the expression tree. Decorators and interceptors might be applied at this point,
// causing the lifestyle and registration properties to change.
producer.BuildExpression();
Type implementationType = producer.Registration.ImplementationType;
return(HasInstanceContextModeSingle(implementationType)
? new SimpleInjectorServiceHost(container, GetSingletonInstance(producer), baseAddresses)
: new SimpleInjectorServiceHost(container, serviceType, implementationType, baseAddresses));
}
// This extension method is equivalent to the following registration, for each and every T:
// container.Register<Lazy<T>>(() => new Lazy<T>(() => container.GetInstance<T>()));
// This is useful for consumers that have a dependency on a service that is expensive to create, but
// not always needed.
// This mimics the behavior of Autofac and Ninject 3. In Autofac this behavior is default.
public static void AllowResolvingLazyFactories(this Container container)
{
container.ResolveUnregisteredType += (sender, e) =>
{
if (e.UnregisteredServiceType.IsClosedTypeOf(typeof(Lazy <>)))
{
Type serviceType = e.UnregisteredServiceType.GetGenericArguments()[0];
InstanceProducer registration = container.GetRegistration(serviceType, true);
Type funcType = typeof(Func <>).MakeGenericType(serviceType);
var factoryDelegate = Expression.Lambda(funcType, registration.BuildExpression()).Compile();
var lazyConstructor = (
from ctor in e.UnregisteredServiceType.GetConstructors()
where ctor.GetParameters().Length == 1
where ctor.GetParameters()[0].ParameterType == funcType
select ctor)
.Single();
var expression = Expression.New(lazyConstructor, Expression.Constant(factoryDelegate));
var lazyRegistration = registration.Lifestyle.CreateRegistration(
serviceType: e.UnregisteredServiceType,
instanceCreator: Expression.Lambda <Func <object> >(expression).Compile(),
container: container);
e.Register(lazyRegistration);
}
};
}
private static IEnumerable <Type> GetExpressionTypes(InstanceProducer instanceProducer)
{
var expression = instanceProducer.BuildExpression();
var visitor = new TypeExpressionVisitor();
visitor.Visit(expression);
return(visitor.Types);
}
public Expression BuildExpression(InjectionConsumerInfo consumer)
{
Requires.IsNotNull(consumer, "consumer");
InstanceProducer producer = this.GetInstanceProducerFor(consumer);
// When the instance producer is invalid, this call will fail with an expressive exception.
return(producer.BuildExpression());
}
public Expression BuildParameterExpression(ParameterInfo parameter)
{
Requires.IsNotNull(parameter, "parameter");
InstanceProducer producer = this.GetInstanceProducerFor(parameter);
// When the instance producer is invalid, this call will fail with an expressive exception.
return(producer.BuildExpression());
}
private static Expression BuildInterceptorExpression <TInterceptor>(Container container)
where TInterceptor : class
{
InstanceProducer interceptorRegistration = container.GetRegistration(typeof(TInterceptor));
if (interceptorRegistration == null)
{
// This will throw an ActivationException
container.GetInstance <TInterceptor>();
}
return(interceptorRegistration.BuildExpression());
}
public InstanceProducer GetInstanceProducer(InjectionConsumerInfo consumer, bool throwOnFailure)
{
InstanceProducer producer = this.defaultBehavior.GetInstanceProducer(consumer, throwOnFailure);
List <PredicatePair> pairs;
if (this.MustApplyContextualDecorator(consumer.Target.TargetType, out pairs))
{
return(this.ApplyDecorator(consumer.Target, producer.BuildExpression(), pairs));
}
return(producer);
}
public void BuildExpression_WithAutoVerificationEnabledOnAcyclicGraph_ShouldNotCauseACyclicGraphException()
{
// Arrange
var container = ContainerFactory.New();
container.Options.EnableAutoVerification = true;
container.Register <ICommand, ConcreteCommand>(new AsyncScopedLifestyle());
InstanceProducer producer = container.GetRegistration(typeof(ICommand));
// Act
// NOTE: I had to change the places in InstanceProducer where the container was locked, to prevent
// this test from failing.
producer.BuildExpression();
}
// This extension method is equivalent to the following registration, for each and every T:
// container.RegisterInstance<Func<T>>(() => container.GetInstance<T>());
// This is useful for consumers that need to create multiple instances of a dependency.
// This mimics the behavior of Autofac. In Autofac this behavior is default.
public static void AllowResolvingFuncFactories(this Container container)
{
container.ResolveUnregisteredType += (sender, e) =>
{
if (e.UnregisteredServiceType.IsClosedTypeOf(typeof(Func <>)))
{
Type serviceType = e.UnregisteredServiceType.GetGenericArguments()[0];
InstanceProducer registration = container.GetRegistration(serviceType, true);
var factoryDelegate = Expression.Lambda(
e.UnregisteredServiceType, registration.BuildExpression()).Compile();
e.Register(Expression.Constant(factoryDelegate));
}
};
}
public void BuildExpression_ManuallyCompiledToDelegate_CanBeExecutedSuccessfully()
{
// Arrange
var container = ContainerFactory.New();
container.Register <ICommand, ConcreteCommand>(new AsyncScopedLifestyle());
// Creating the instance for type ICommand failed. The configuration is invalid.
// The type ConcreteCommand is directly or indirectly depending on itself.
// The cyclic graph contains the following types: ConcreteCommand.
// Verification was triggered because Container.Options.EnableAutoVerification was enabled.
// To prevent the container from being verified on first resolve, set the value to false.
InstanceProducer producer = container.GetRegistration(typeof(ICommand));
Expression expression = producer.BuildExpression();
var factory = Expression.Lambda <Func <ICommand> >(expression).Compile();
using (AsyncScopedLifestyle.BeginScope(container))
{
// Act
factory();
}
}