ContainerRegisterConditional Method (Type, Type, Lifestyle, PredicatePredicateContext)

Simple Injector
Conditionally registers that an instance of implementationType 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. 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
Copy
public void RegisterConditional(
	Type serviceType,
	Type implementationType,
	Lifestyle lifestyle,
	Predicate<PredicateContext> predicate
)

Parameters

serviceType
Type: SystemType
The base type or interface to register. This can be an open-generic type.
implementationType
Type: SystemType
The actual type that will be returned when requested.
lifestyle
Type: SimpleInjectorLifestyle
The lifestyle that defines how returned instances are cached.
predicate
Type: SystemPredicatePredicateContext
The predicate that determines whether the implementationType 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
ExceptionCondition
ArgumentNullExceptionThrown when one of the arguments is a null reference.
ArgumentExceptionThrown when serviceType and implementationType are not a generic type or when serviceType is a partially-closed generic type.
InvalidOperationException Thrown when this container instance is locked and can not be altered.
See Also

Reference

Container Class
RegisterConditional Overload
SimpleInjector Namespace