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POWindows Workflow 4 - when are tracking records emitted?
 

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    <p>I have a long running activity (where the activity is continually doing work for a long period of time - <em>not</em> an activity that is waiting for a response from an external source) and I want to report progress from that activity. However, I cannot get this to work.</p> <p>I have a simple console app that runs the activity:</p> <pre><code>class Program { static void Main(string[] args) { var wfApp = new WorkflowApplication(new ActivityLibrary.ProgressActivity()); var autoResetEvent = new AutoResetEvent(false); wfApp.Completed = e =&gt; autoResetEvent.Set(); wfApp.Extensions.Add(new ConsoleTrackingParticipant()); wfApp.Run(); autoResetEvent.WaitOne(); Console.WriteLine("Done"); Console.ReadLine(); } } internal class ConsoleTrackingParticipant : TrackingParticipant { protected override void Track(TrackingRecord record, TimeSpan timeout) { Console.WriteLine(record.EventTime.ToString()); } } </code></pre> <p>I've tried implementing the ProgressActivity in two ways. First I tried deriving from CodeActivity, but when I use this implementation I receive all the custom tracking records together once the workflow has completed (though the reported record.EventTime is correct):</p> <pre><code>public sealed class ProgressActivity : CodeActivity { protected override void Execute(CodeActivityContext context) { for (var i = 0; i &lt;= 10; i++) { var customTrackingRecord = new CustomTrackingRecord("ProgressTrackingRecord") { Data = { { "Progress", i * 10.0 }} }; context.Track(customTrackingRecord); Thread.Sleep(1000); } } } </code></pre> <p>I then tried deriving from AsyncCodeActivity, but in this case I get an "ObjectDisposedException: An ActivityContext can only be accessed within the scope of the function it was passed into" on the context.Track line:</p> <pre><code>public sealed class ProgressActivity : AsyncCodeActivity { protected override IAsyncResult BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, object state) { Action action = () =&gt; { for (var i = 0; i &lt;= 10; i++) { var customTrackingRecord = new CustomTrackingRecord("ProgressTrackingRecord") { Data = { { "Progress", i * 10.0 } } }; context.Track(customTrackingRecord); Thread.Sleep(1000); } }; context.UserState = action; return action.BeginInvoke(callback, state); } protected override void EndExecute(AsyncCodeActivityContext context, IAsyncResult result) { ((Action)context.UserState).EndInvoke(result); } } </code></pre> <p>Can anyone explain where I've gone wrong?</p> <p>P.S. I realise that the approach I've shown would not scale well if the workflow was ever to run on a server, but the application I'm building is a desktop application.</p> <p>[EDIT] I guess I'm actually asking a broader question here: when are tracking records emitted by the workflow execution engine? My investigations suggest that all the records for a specific activity are emitted <em>after</em> the activity has completed. Is there any way to force them to be emitted during the execution of the activity?</p>
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