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GetWorkflowEvent

  • Artigo

Pushes the name of the current workflow event onto the stack.

Syntax


<wf:Operation Name="GetWorkflowEvent" />

Parameters

None.

Pushed Value

String containing the current workflow event.

Remarks

A workflow instance can pass through several states during the course of its execution. For example, a workflow instance may become idle, or it may be suspended. Every time the workflow instance changes state, it emits a workflow status event to the runtime tracking infrastructure. The Windows Workflow Foundation BAM interceptor supports most of the events defined by the System.Workflow.Runtime.Tracking.TrackingWorkflowEvent enumeration, as shown in the following table.

Activity event Description
Changed A workflow change has occurred on the workflow instance.
Completed The workflow instance has completed.
Created The workflow instance has been created.
Exception An unhandled exception has occurred.
Idle The workflow instance is idle.
Loaded The workflow instance has been loaded into memory.
Persisted The workflow instance has been persisted.
Resumed A previously suspended workflow instance has resumed running.
Started The workflow instance has been started.
Suspended The workflow instance has been suspended.
Terminated The workflow instance has been terminated.
Unloaded The workflow instance has been unloaded from memory.

Note

You cannot use both GetWorkflowEvent and GetActivityEvent in the same OnEvent element.

Example

The following sample contains a filter that is configured to find a specific activity—"FoodAndDrinksPolicy"—in a workflow. In the sample, a filter is configured to find the activity named "FoodAndDrinksPolicy" in a closed workflow. This is done by comparing the value returned by GetWorkflowEvent to the constant "Created".

<ic:Filter>
  <ic:Expression>
    <wf:Operation Name="GetWorkflowEvent" />
      <ic:Operation Name="Constant">
        <ic:Argument>Created</ic:Argument>
      </ic:Operation>
    <ic:Operation Name="Equals" />
  </ic:Expression>
</ic:Filter>

This operation is useful for tracking the lifetime of a workflow and for detecting exceptions or other problems with the workflow.

See Also

System.Workflow.Runtime.Tracking.TrackingWorkflowEvent enumeration