EventInterceptionAspect Class |
Aspect that, when applied on an event, intercepts invocations of its semantics Add (OnAddHandler(EventInterceptionArgs)),
Remove (OnRemoveHandler(EventInterceptionArgs)) and Invoke (OnInvokeHandler(EventInterceptionArgs)).
Inheritance HierarchySystem.Object
System.Attribute
PostSharp.Extensibility.MulticastAttribute
PostSharp.Aspects.Aspect
PostSharp.Aspects.EventLevelAspect
PostSharp.Aspects.EventInterceptionAspect
PostSharp.Patterns.Model.WeakEventAttribute
System.Attribute
PostSharp.Extensibility.MulticastAttribute
PostSharp.Aspects.Aspect
PostSharp.Aspects.EventLevelAspect
PostSharp.Aspects.EventInterceptionAspect
PostSharp.Patterns.Model.WeakEventAttribute
Namespace: PostSharp.Aspects
Assembly: PostSharp (in PostSharp.dll) Version: 6.6.14.0 (6.6.14.0)
SyntaxC#
[SerializableAttribute] public abstract class EventInterceptionAspect : EventLevelAspect, IEventInterceptionAspect, IEventLevelAspect, IAspect
The EventInterceptionAspect type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | EventInterceptionAspect | Initializes a new instance of the EventInterceptionAspect class |
Properties| Name | Description | |
|---|---|---|
 | AspectPriority |
Gets or sets the weaving priority of the aspect.
(Inherited from Aspect.) |
| AttributeExclude |
If true, indicates that this attribute removes all other instances of the
same attribute type from the set of elements defined by the current instance.
(Inherited from MulticastAttribute.) |
| AttributeInheritance |
Determines whether this attribute is inherited
(Inherited from MulticastAttribute.) |
| AttributePriority |
Gets or sets the priority of the current attribute in case that multiple
instances are defined on the same element (lower values are processed before).
(Inherited from MulticastAttribute.) |
| AttributeReplace |
Determines whether this attribute replaces other attributes found on the
target declarations.
(Inherited from MulticastAttribute.) |
| AttributeTargetAssemblies |
Gets or sets the assemblies to which the current attribute apply.
(Inherited from MulticastAttribute.) |
| AttributeTargetElements |
Gets or sets the kind of elements to which this custom attributes applies.
(Inherited from MulticastAttribute.) |
| AttributeTargetExternalMemberAttributes |
Gets or sets the visibilities, scopes, virtualities, and implementation
of members to which this attribute applies, when the member is external to the current module.
(Inherited from MulticastAttribute.) |
| AttributeTargetExternalTypeAttributes |
Gets or sets the visibilities of types to which this attribute applies,
when this type is external to the current module.
(Inherited from MulticastAttribute.) |
| AttributeTargetMemberAttributes |
Gets or sets the visibilities, scopes, virtualities, and other characteristics
of members to which this attribute applies.
(Inherited from MulticastAttribute.) |
| AttributeTargetMembers |
Gets or sets the expression specifying to which members
this instance applies.
(Inherited from MulticastAttribute.) |
| AttributeTargetParameterAttributes |
Gets or sets the passing style (by value, out or ref)
of parameters to which this attribute applies.
(Inherited from MulticastAttribute.) |
| AttributeTargetParameters |
Gets or sets the expression specifying to which parameters
this instance applies.
(Inherited from MulticastAttribute.) |
| AttributeTargetTypeAttributes |
Gets or sets the attributes of types to which this attribute applies. Visibility, scope (Instance or Static)
and generation are the only categories that are taken into account; attributes of other categories are ignored.
(Inherited from MulticastAttribute.) |
| AttributeTargetTypes |
Gets or sets the expression specifying to which types
this instance applies.
(Inherited from MulticastAttribute.) |
 | SerializerType |
Gets or sets the Type of the serializer (a type derived
from AspectSerializer) used to serialize the aspect instance
at build time and deserialize it at runtime.
(Inherited from Aspect.) |
| UnsupportedTargetAction |
Specifies the action to take when the aspect is applied to an unsupported target element. This property affects only simple aspects, not composite aspects.
(Inherited from Aspect.) |
Methods| Name | Description | |
|---|---|---|
 | CompileTimeInitialize |
Method invoked at build time to initialize the instance fields of the current aspect. This method is invoked
before any other build-time method.
(Inherited from EventLevelAspect.) |
| CompileTimeValidate(Object) |
Method invoked at build time to ensure that the aspect has been applied to the right target.
(Inherited from EventLevelAspect.) |
| CompileTimeValidate(EventInfo) |
Method invoked at build time to ensure that the aspect has been applied to the right target.
(Inherited from EventLevelAspect.) |
| CreateAspectConfiguration |
Method invoked at build time to create a concrete AspectConfiguration instance specifically
for the current Aspect type.
(Overrides Aspect.CreateAspectConfiguration().) |
| GetAspectConfiguration |
Method invoked at build tome to get the imperative configuration of the current Aspect.
(Inherited from Aspect.) |
| OnAddHandler |
Method invoked instead of the Add semantic of the event to which the current aspect is applied,
i.e. when a new delegate is added to this event.
|
| OnInvokeHandler |
Method invoked when the event to which the current aspect is applied is fired, for each delegate
of this event, and instead of invoking this delegate.
|
| OnRemoveHandler |
Method invoked instead of the Remove semantic of the event to which the current aspect is applied,
i.e. when a delegate is removed from this event.
|
| RuntimeInitialize |
Initializes the current aspect.
(Inherited from EventLevelAspect.) |
| SetAspectConfiguration(AspectConfiguration, Object) |
Method invoked at build time to set up an AspectConfiguration object according to the current
Aspect instance and a specified target element of the current aspect.
(Inherited from EventLevelAspect.) |
| SetAspectConfiguration(AspectConfiguration, EventInfo) |
Method invoked at build time to set up an AspectConfiguration object according to the current
Aspect instance and a specified target element of the current aspect.
(Inherited from EventLevelAspect.) |
RemarksApplying an aspect of type EventInterceptionAspect to an event results in the add and remove methods of the event to be replaced by a call to OnAddHandler(EventInterceptionArgs) and OnRemoveHandler(EventInterceptionArgs), respectively. The original accessor body is moved into new methods, which the aspect code can call by invoking ProceedAddHandler() or ProceedRemoveHandler().
The method OnInvokeHandler(EventInterceptionArgs), if defined, is called instead when the event is raised, once for every handler that has been added to the list. When you define OnInvokeHandler(EventInterceptionArgs) method, PostSharp will use a broker object to control access to the event; this broker object will be the unique subscriber of the event, and maintains its own list of subscribers.
 Note |
|---|
| The aspect works only when caller code access the event through its add/remove semantics. It does not work when the caller code bypasses the event semantics and accesses directly its implementation (the underlying field of the event, typically). The C# compiler is known to bypass the semantics when the event is accessed directly from the class declaring it (it accesses directly the private field whenever it can). |
| Note |
|---|
| All classes implementing IAspect should typically be marked as serializable using the SerializableAttribute or PSerializableAttribute custom attribute . Fields that are only used at runtime (and unknown at compile-time) should be carefully marked with the NonSerializedAttribute or PNonSerializedAttribute custom attribute. When PostSharp is used on a platform that does not support aspect serialization (such as .NET Compact Framework, Silverlight, or Windows Phone), or when another aspect serializer is used, it is not necessary to mark the aspect class as serializable. For more information, see Aspect Serialization . |
See Also