ContainerRegisterConditional Method (Type, Registration, PredicatePredicateContext)

Simple Injector

Conditionally registers that registration will be used every time a serviceType is requested and where the supplied predicate returns true. The predicate will only be evaluated a finite number of times; the predicate is unsuited for making decisions based on runtime conditions.

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

Syntax

ASP.NET

Copy

public void RegisterConditional(
	Type serviceType,
	Registration registration,
	Predicate<PredicateContext> predicate
)

Public Sub RegisterConditional ( 
	serviceType As Type,
	registration As Registration,
	predicate As Predicate(Of PredicateContext)
)

Parameters

serviceType: Type: SystemType
The base type or interface to register. This can be an open-generic type.
registration: Type: SimpleInjectorRegistration
The Registration instance to register.
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 open generic or registration is not assignable to serviceType.
InvalidOperationException	Thrown when this container instance is locked and can not be altered.

Reference

Container Class

RegisterConditional Overload

SimpleInjector Namespace