ResolutionValueExtensionsResolveOptionalTService Method (IComponentContext, IEnumerableParameter)

Retrieve a service from the context, or null if the service is not registered.

Namespace: Autofac
Assembly: Autofac (in Autofac.dll) Version: 6.0.0+39696a967e8826f7f1ebc8c1ff4523c9dd75abe0

Syntax

public static Nullable<TService> ResolveOptional<TService>(
	this IComponentContext context,
	IEnumerable<Parameter> parameters
)
where TService : struct, new()

<ExtensionAttribute>
Public Shared Function ResolveOptional(Of TService As {Structure, New}) ( 
	context As IComponentContext,
	parameters As IEnumerable(Of Parameter)
) As Nullable(Of TService)

Parameters

context: Type: AutofacIComponentContext
The context from which to resolve the service.
parameters: Type: System.Collections.GenericIEnumerableParameter
Parameters for the service.

Type Parameters

TService: The service to resolve.

Return Value

Type: NullableTService
The component instance that provides the service, or null.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IComponentContext. 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).

Exceptions

Exception	Condition
DependencyResolutionException

Reference

ResolutionValueExtensions Class

ResolveOptional Overload

Autofac Namespace