WorkflowRuntime.ServicesExceptionNotHandled Event
Definition
Important
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Occurs when a service that is derived from the WorkflowRuntimeService class calls RaiseServicesExceptionNotHandledEvent(Exception, Guid).
public:
event EventHandler<System::Workflow::Runtime::ServicesExceptionNotHandledEventArgs ^> ^ ServicesExceptionNotHandled;public event EventHandler<System.Workflow.Runtime.ServicesExceptionNotHandledEventArgs> ServicesExceptionNotHandled;member this.ServicesExceptionNotHandled : EventHandler<System.Workflow.Runtime.ServicesExceptionNotHandledEventArgs> Public Custom Event ServicesExceptionNotHandled As EventHandler(Of ServicesExceptionNotHandledEventArgs) Public Event ServicesExceptionNotHandled As EventHandler(Of ServicesExceptionNotHandledEventArgs) Event Type
Remarks
A service that is derived from the WorkflowRuntimeService class can call the RaiseServicesExceptionNotHandledEvent method to inform subscribers to the ServicesExceptionNotHandled event that an exception that it was unable to handle occurred during its execution. You can subscribe to this event to implement a recovery mechanism.
This event is raised when a workflow instance has not been created yet by the workflow run-time engine and an exception occurs. In this scenario, the only way to inform a host application that an exception occurred is to raise this event. However, the workflow run-time engine does not call this directly. Instead, the workflow run-time engine either delivers an exception to the workflow instance or, if there is no instance, throws back to the caller, which in this case is actually the service that fires this event. If you create your own persistence or scheduler service, you must implement this event yourself through the base RaiseServicesExceptionNotHandledEvent method.
For the ServicesExceptionNotHandled event, the sender contains the WorkflowRuntime and WorkflowEventArgs contains the Guid of the workflow instance that was using the service and the Exception that could not be handled.
For more information about handling events, see Handling and raising events.
