Open sandboxFocus
  • TOC

Post­Sharp Documentation

Introduction

Deployment and Configuration

Adding Aspects to Code

Logging

Contracts

INotify­Property­Changed

Weak Event

XAML

Parent/Child, Visitor and Disposable

Undo/Redo

Caching

Multithreading

Developing Custom Aspects

Validating Architecture

Testing and Debugging

Miscellaneous

API Reference

Post­Sharp

Post­Sharp.​Aspects

Advice­Args

Arguments

Aspect3

Aspect­Description­Attribute2

Aspect­Info

Aspect­Instance2

Aspect­Specification

Aspect­Utilities

Assembly­Level­Aspect4

Async­Call­Id

Composition­Aspect5

Constructor­Depth

Custom­Attribute­Introduction­Aspect

Event­Interception­Args2

Event­Interception­Aspect5

Event­Level­Aspect4

Field­Level­Aspect4

Flow­Behavior

IAspect

IAspect­Build­Semantics

IAspect­Instance

IAspect­Provider

IAspect­Repository­Service

IAssembly­Level­Aspect

IAssembly­Level­Aspect­Build­Semantics

IAsync­Method­Binding

IAsync­Method­Interception­Aspect

IClone­Aware­Aspect

IComposition­Aspect

ICustom­Attribute­Introduction­Aspect

IEvent­Binding

IEvent­Interception­Aspect

IEvent­Level­Aspect

IEvent­Level­Aspect­Build­Semantics

IField­Level­Aspect

IField­Level­Aspect­Build­Semantics

IInstance­Scoped­Aspect

ILocation­Binding

ILocation­Binding<T>

ILocation­Binding­Action<TPayload>

ILocation­Interception­Args

ILocation­Interception­Args<T>

ILocation­Interception­Args­Action<TPayload>

ILocation­Interception­Aspect

ILocation­Level­Aspect

ILocation­Level­Aspect­Build­Semantics

ILocation­Validation­Aspect

ILocation­Validation­Aspect<T>

IManaged­Resource­Introduction­Aspect

IMethod­Binding

IMethod­Interception­Aspect

IMethod­Level­Aspect

IMethod­Level­Aspect­Build­Semantics

Instance­Level­Aspect5

IOn­Exception­Aspect

IOn­Instance­Location­Initialized­Aspect

IOn­Method­Boundary­Aspect

IOn­State­Machine­Boundary­Aspect

IType­Level­Aspect

IType­Level­Aspect­Build­Semantics

Lines­Of­Code­Avoided­Attribute2

Location­Binding­Extensions

Location­Initialization­Args3

Location­Interception­Args3

Location­Interception­Aspect5

Location­Level­Aspect4

Location­Validation­Context

Managed­Resource­Introduction­Aspect

Method­Binding­Invoke­Awaitable

Method­Binding­Invoke­Awaiter

Method­Execution­Args2

Method­Implementation­Aspect5

Method­Interception­Args2

Method­Interception­Aspect5

Method­Interception­Proceed­Awaitable

Method­Interception­Proceed­Awaiter

Method­Level­Aspect4

Module­Initializer­Attribute2

Null­Task­Sentinel

On­Exception­Aspect5

On­Method­Boundary­Aspect5

Semantically­Advised­Method­Kinds

Type­Identity

Type­Level­Aspect4

Unsupported­Target­Action

Post­Sharp.​Aspects.​Advices

Post­Sharp.​Aspects.​Configuration

Post­Sharp.​Aspects.​Dependencies

Post­Sharp.​Aspects.​Internals

Post­Sharp.​Aspects.​Serialization

Post­Sharp.​Collections

Post­Sharp.​Constraints

Post­Sharp.​Extensibility

Post­Sharp.​Extensibility.​Build­Time­Logging

Post­Sharp.​Patterns

Post­Sharp.​Patterns.​Caching

Post­Sharp.​Patterns.​Caching.​Backends

Post­Sharp.​Patterns.​Caching.​Backends.​Azure

Post­Sharp.​Patterns.​Caching.​Backends.​Redis

Post­Sharp.​Patterns.​Caching.​Dependencies

Post­Sharp.​Patterns.​Caching.​Formatters

Post­Sharp.​Patterns.​Caching.​Implementation

Post­Sharp.​Patterns.​Caching.​Locking

Post­Sharp.​Patterns.​Caching.​Serializers

Post­Sharp.​Patterns.​Caching.​Value­Adapters

Post­Sharp.​Patterns.​Collections

Post­Sharp.​Patterns.​Collections.​Advices

Post­Sharp.​Patterns.​Contracts

Post­Sharp.​Patterns.​Diagnostics

Post­Sharp.​Patterns.​Diagnostics.​Adapters.​Asp­Net­Core

Post­Sharp.​Patterns.​Diagnostics.​Adapters.​Asp­Net­Framework

Post­Sharp.​Patterns.​Diagnostics.​Adapters.​Diagnostic­Source

Post­Sharp.​Patterns.​Diagnostics.​Adapters.​Http­Client

Post­Sharp.​Patterns.​Diagnostics.​Audit

Post­Sharp.​Patterns.​Diagnostics.​Backends

Post­Sharp.​Patterns.​Diagnostics.​Backends.​Application­Insights

Post­Sharp.​Patterns.​Diagnostics.​Backends.​Audit

Post­Sharp.​Patterns.​Diagnostics.​Backends.​Common­Logging

Post­Sharp.​Patterns.​Diagnostics.​Backends.​Console

Post­Sharp.​Patterns.​Diagnostics.​Backends.​Event­Source

Post­Sharp.​Patterns.​Diagnostics.​Backends.​Log4Net

Post­Sharp.​Patterns.​Diagnostics.​Backends.​Microsoft

Post­Sharp.​Patterns.​Diagnostics.​Backends.​Multiplexer

Post­Sharp.​Patterns.​Diagnostics.​Backends.​NLog

Post­Sharp.​Patterns.​Diagnostics.​Backends.​Null

Post­Sharp.​Patterns.​Diagnostics.​Backends.​Serilog

Post­Sharp.​Patterns.​Diagnostics.​Backends.​Trace

Post­Sharp.​Patterns.​Diagnostics.​Backends.​Trace­Source

Post­Sharp.​Patterns.​Diagnostics.​Contexts

Post­Sharp.​Patterns.​Diagnostics.​Correlation

Post­Sharp.​Patterns.​Diagnostics.​Custom

Post­Sharp.​Patterns.​Diagnostics.​Custom.​Messages

Post­Sharp.​Patterns.​Diagnostics.​Formatters

Post­Sharp.​Patterns.​Diagnostics.​Record­Builders

Post­Sharp.​Patterns.​Diagnostics.​Threading­Instrumentation

Post­Sharp.​Patterns.​Diagnostics.​Transactions

Post­Sharp.​Patterns.​Diagnostics.​Transactions.​Model

Post­Sharp.​Patterns.​Dynamic­Advising

Post­Sharp.​Patterns.​Formatters

Post­Sharp.​Patterns.​Model

Post­Sharp.​Patterns.​Model.​Controls

Post­Sharp.​Patterns.​Model.​Type­Adapters

Post­Sharp.​Patterns.​Recording

Post­Sharp.​Patterns.​Recording.​Operations

Post­Sharp.​Patterns.​Threading

Post­Sharp.​Patterns.​Threading.​Models

Post­Sharp.​Patterns.​Utilities

Post­Sharp.​Patterns.​Xaml

Post­Sharp.​Reflection

Post­Sharp.​Reflection.​Method­Body

Post­Sharp.​Serialization

  • Article

Class OnExceptionAspect

Aspect that, when applied to a method, defines an exception handler around the whole method and calls a custom method in this exception handler.

Namespace: PostSharp.Aspects
Assembly: PostSharp.dll
Syntax
[AttributeUsage(AttributeTargets.Assembly|AttributeTargets.Class|AttributeTargets.Struct|AttributeTargets.Constructor|AttributeTargets.Method|AttributeTargets.Property|AttributeTargets.Event|AttributeTargets.Interface, AllowMultiple = true, Inherited = false)]
[MulticastAttributeUsage(MulticastTargets.Method|MulticastTargets.InstanceConstructor|MulticastTargets.StaticConstructor, TargetMemberAttributes = MulticastAttributes.AnyVisibility|MulticastAttributes.AnyScope|MulticastAttributes.NonAbstract|MulticastAttributes.Managed, AllowMultiple = true)]
[HasInheritedAttribute]
[AspectConfigurationAttributeType(typeof(OnExceptionAspectConfigurationAttribute))]
[Serializer(null)]
public abstract class OnExceptionAspect : MethodLevelAspect, IMethodLevelAspectBuildSemantics, IAspectBuildSemantics, IValidableAnnotation, IOnExceptionAspect, IMethodLevelAspect, IAspect
Remarks

The OnExceptionAspect aspect adds an exception handler to the method to which it is applied. It allows you to easily encapsulate exception handling policies as a custom attribute.

The most important method is OnException(MethodExecutionArgs). It is the exception handler in itself.

The current exception is available from the Exception property of the MethodExecutionArgs object. This property is read-only. If you need to replace the current exception by another one, you should throw a new exception from the handler. If you need to ignore the exception, set the FlowBehavior property to Continue.

An object of type MethodExecutionArgs is passed to every advice of this aspect. This object allows you to:

  • Get or set arguments. Input and output arguments are available on the property Arguments. You can change output (out) and by-reference (ref) arguments, but not input arguments. If you need to modify arguments passed by value, consider using a MethodInterceptionAspect (see property Arguments).
  • Get the current exception. The current exception is available in the property Exception (only from the OnException(MethodExecutionArgs) advice). You can also replace the exception (see Exception for details).
  • Get or set the return value. The return value is available in the ReturnValue property. You can also modify it.
  • Change the method control flow. You can change the value of the FlowBehavior property to specify whether the target method should continue to execute after the execution of the current advice. This may be useful to implement a caching aspect or an exception handler.
  • Share state between advices. You can use the MethodExecutionTag property to store state between the execution of different advices related to the same execution of a method. For instance, you can store a cache key in OnEntry(MethodExecutionArgs) and find it back in OnSuccess(MethodExecutionArgs). Using MethodExecutionTag is the only way to share state that is both thread-safe and reentrant.

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 Understanding Aspect Serialization .

Understanding Aspect Serialization

Constructors

Name Description
OnExceptionAspect()

Properties

Name Description
SemanticallyAdvisedMethodKinds

Determines which target methods will be advised semantically. This affects the behavior of the aspect when it's applied to iterator or async methods, which are compiled into state machines.

UnsupportedTargetAction

Specifies the action to take when the aspect is applied to an unsupported target method.

Methods

Name Description
CreateAspectConfiguration()

Method invoked at build time to create a concrete AspectConfiguration instance specifically for the current Aspect type.

GetExceptionType(MethodBase)

Gets the type of exception handled by this aspect.

OnException(MethodExecutionArgs)

Method executed after the body of methods to which this aspect is applied, in case that the method failed with an exception (i.e., in a catch block).

SetAspectConfiguration(AspectConfiguration, MethodBase)

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.

See Also