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RegistrationExtensionsIfNotRegisteredTLimit, TActivatorData, TStyle Method

Attaches a predicate such that a registration will only be made if a specific service type is not already registered. The predicate will run at registration time, not runtime, to determine whether the registration should execute.

Namespace:  Autofac
Assembly:  Autofac (in Autofac.dll) Version: 6.0.0+39696a967e8826f7f1ebc8c1ff4523c9dd75abe0
public static IRegistrationBuilder<TLimit, TActivatorData, TStyle> IfNotRegistered<TLimit, TActivatorData, TStyle>(
	this IRegistrationBuilder<TLimit, TActivatorData, TStyle> registration,
	Type serviceType


Type: Autofac.BuilderIRegistrationBuilderTLimit, TActivatorData, TStyle
The registration to configure.
Type: SystemType
The service type to check for to determine if the registration should be made. Note this is the *service type* - the As<T> part.

Type Parameters

Registration limit type.
Activator data type.
Registration style.

Return Value

Type: IRegistrationBuilderTLimit, TActivatorData, TStyle
A registration builder allowing further configuration of the component.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IRegistrationBuilderTLimit, TActivatorData, TStyle. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
ArgumentNullException Thrown if registration or serviceType is .
NotSupportedException Thrown if registration has no reference to the original callback with which it was associated (e.g., it wasn't made with a standard registration method as part of a ContainerBuilder).
See Also