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Part I
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Introducing Windows Workflow Foundation (WF)
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SqlCommand cmd = new SqlCommand(storedProc, conn); cmd.CommandType = CommandType.StoredProcedure; SqlParameter parm = new SqlParameter("@TypeFullName", SqlDbType.NVarChar, 128); parm.Direction = ParameterDirection.Input; parm.Value = typeof(TrackedWorkflow.Workflow1).ToString(); cmd.Parameters.Add(parm); parm = new SqlParameter("@AssemblyFullName", SqlDbType.NVarChar, 256); parm.Direction = ParameterDirection.Input; parm.Value = typeof(TrackedWorkflow.Workflow1).Assembly.FullName; cmd.Parameters.Add(parm); parm = new SqlParameter("@Version", SqlDbType.VarChar, 32); parm.Direction = ParameterDirection.Input; parm.Value = "1.0.0.0"; cmd.Parameters.Add(parm); parm = new SqlParameter("@TrackingProfileXml", SqlDbType.NText); parm.Direction = ParameterDirection.Input; parm.Value = writer.ToString(); cmd.Parameters.Add(parm); conn.Open(); cmd.ExecuteNonQuery(); } // if } // try catch (Exception ex) { if (ex is SqlException) { // Check to see if it's a version error. if (ex.Message.Substring(0,24) == "A version already exists") { // Version already exists... Console.WriteLine("NOTE: a profile with the same version" + " already exists in the database"); } // if else { // Write error message Console.WriteLine("Error writing profile to database: {0}", ex.ToString()); } // else } // if else { // Write error message Console.WriteLine("Error writing profile to database: {0}", ex.ToString()); } // else } // catch finally {
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5
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if (conn != null) { conn.Close(); } // if } // finally }
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6. If you execute the application at this point, by pressing F5 or Ctrl+F5, the profile created in CreateProfile should be built and written to the database. If you look closely at the code shown in step 4, you ll note that only a small handful of activity and workflow events are being tracked. Therefore, we should expect to see far fewer lines of text written to the console window by ShowActivityTrackingEvents and ShowWorkflowTrackingEvents. And in fact, that is exactly what happens, as you can see in Figure 5-4 (compare this to Figure 5-2):
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Figure 5-4
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CreateProfile creates a new TrackingProfile and adds both an activity tracking point and a workflow tracking point. Each tracking point has a single tracking location defined that dictates which events are tracked. (Events not listed are excluded by default.) So we should see only Executing events from activities and Started and Idle events from the workflow instance, and indeed, if you examine the screen output shown in the preceding figure, this is the case. StoreProfile, in turn, serializes the tracking profile to its XML form and then uses typical ADO.NET techniques to record the XML in the tracking database. Because it is considered an error by the tracking database profile update logic to try to update a tracking profile with the same version, the catch logic in StoreProfile senses this and writes an informational note to the console window. Otherwise, the entire error string is written if there is an exception.
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Part I
Introducing Windows Workflow Foundation (WF)
Viewing Tracking Information with WorkflowMonitor
Wouldn t it be nice if someone came up with a ready-made tool we could use to monitor workflow events It s great to be able to spit out the tracking records as we did earlier in the chapter, but a nice graphical user interface would be a lot better to work with. And in fact, we re in luck! When you loaded WF, you also loaded a set of samples, and included in the samples is an application called WorkflowMonitor. So for the price of a compilation step and some file finagling, we can have a simple yet graphical event tracking monitor application. Here s what we need to do to compile the application. Compile WorkflowMonitor 1. WorkflowMonitor is part of the workflow samples library that ships with the Windows Software Development Kit (SDK). Copy the WFSamples.zip file from its installed location to \Workflow\5 and unzip the contents if you ve not already done so in another directory. The WFSamples.zip file can be found in the following directory:
C:\Program Files\Microsoft SDKs\Windows\v6.0\Samples\WFSamples.zip
2. Open the WorkflowMonitor.sln file in Visual Studio by selecting File, Open, Project/ Solution and locating the file by using the resulting Open Project dialog box. You ll find the solution file in the following (unzipped) directory:
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