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ParameterFilterAttribute Class

Base attribute class for marking constructor parameters and enabling filtering by attributed criteria.
Inheritance Hierarchy

Namespace:  Autofac.Features.AttributeFilters
Assembly:  Autofac (in Autofac.dll) Version: 4.9.1+831973f4d02fbc619921dfaa8ac0c536f60ae7a3
Syntax
[AttributeUsageAttribute(AttributeTargets.Parameter)]
public abstract class ParameterFilterAttribute : Attribute

The ParameterFilterAttribute type exposes the following members.

Constructors
  NameDescription
Protected methodParameterFilterAttribute
Initializes a new instance of the ParameterFilterAttribute class
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Properties
  NameDescription
Public propertyTypeId
When implemented in a derived class, gets a unique identifier for this Attribute.
(Inherited from Attribute.)
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Methods
  NameDescription
Public methodEquals
Returns a value that indicates whether this instance is equal to a specified object.
(Inherited from Attribute.)
Protected methodFinalize
Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.
(Inherited from Object.)
Public methodGetHashCode
Returns the hash code for this instance.
(Inherited from Attribute.)
Public methodGetType
Gets the Type of the current instance.
(Inherited from Object.)
Public methodIsDefaultAttribute
When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.
(Inherited from Attribute.)
Public methodMatch
When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.
(Inherited from Attribute.)
Protected methodMemberwiseClone
Creates a shallow copy of the current Object.
(Inherited from Object.)
Public methodResolveParameter
Implemented in derived classes to resolve a specific parameter marked with this attribute.
Public methodToString
Returns a string that represents the current object.
(Inherited from Object.)
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Explicit Interface Implementations
  NameDescription
Explicit interface implementationPrivate method_AttributeGetIDsOfNames
Maps a set of names to a corresponding set of dispatch identifiers.
(Inherited from Attribute.)
Explicit interface implementationPrivate method_AttributeGetTypeInfo
Retrieves the type information for an object, which can be used to get the type information for an interface.
(Inherited from Attribute.)
Explicit interface implementationPrivate method_AttributeGetTypeInfoCount
Retrieves the number of type information interfaces that an object provides (either 0 or 1).
(Inherited from Attribute.)
Explicit interface implementationPrivate method_AttributeInvoke
Provides access to properties and methods exposed by an object.
(Inherited from Attribute.)
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Remarks

Implementations of this attribute can be used to mark constructor parameters so filtering can be done based on registered service data. For example, the MetadataFilterAttribute allows constructor parameters to be filtered by registered metadata criteria and the KeyFilterAttribute allows constructor parameters to be filtered by a keyed service registration.

If a type uses these attributes, it should be registered with Autofac using the WithAttributeFilteringTLimit, TReflectionActivatorData, TRegistrationStyle(IRegistrationBuilderTLimit, TReflectionActivatorData, TRegistrationStyle) extension to enable the behavior.

For specific attribute usage examples, see the attribute documentation.

See Also