ContainerRegisterConditional Method (Type, FuncTypeFactoryContext, Type, Lifestyle, PredicatePredicateContext)

Simple Injector

Conditionally registers that an instance of the type returned from implementationTypeFactory will be returned every time a serviceType is requested and where the supplied predicate returns true. The instance is cached according to the supplied lifestyle. Both the predicate and implementationTypeFactory will only be evaluated a finite number of times; they unsuited for making decisions based on runtime conditions.

Namespace: SimpleInjector
Assembly: SimpleInjector (in SimpleInjector.dll) Version: 5.3.0

Syntax

ASP.NET

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public void RegisterConditional(
	Type serviceType,
	Func<TypeFactoryContext, Type> implementationTypeFactory,
	Lifestyle lifestyle,
	Predicate<PredicateContext> predicate
)

Public Sub RegisterConditional ( 
	serviceType As Type,
	implementationTypeFactory As Func(Of TypeFactoryContext, Type),
	lifestyle As Lifestyle,
	predicate As Predicate(Of PredicateContext)
)

Parameters

serviceType: Type: SystemType
The base type or interface to register. This can be an open-generic type.
implementationTypeFactory: Type: SystemFuncTypeFactoryContext, Type
A factory that allows building Type objects that define the implementation type to inject, based on the given contextual information. The delegate is allowed to return (partially) open-generic types.
lifestyle: Type: SimpleInjectorLifestyle
The lifestyle that defines how returned instances are cached.
predicate: Type: SystemPredicatePredicateContext
The predicate that determines whether the registration can be applied for the requested service type. This predicate can be used to build a fallback mechanism where multiple registrations for the same service type are made. Note that the predicate will be called a finite number of times and its result will be cached for the lifetime of the container. It can't be used for selecting a type based on runtime conditions.

Exceptions

Exception	Condition
ArgumentNullException	Thrown when one of the arguments is a null reference.
ArgumentException	Thrown when serviceType is a partially-closed generic type.
InvalidOperationException	Thrown when this container instance is locked and can not be altered.

Reference

Container Class

RegisterConditional Overload

SimpleInjector Namespace