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5
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Add SqlTrackingService to your workflow 1. WF ships with activity and workflow event tracking capability, so we won t need to do much to track those events. Nonetheless, we will still need to add some logic to the main program application file. Start by adding a reference to System.Configuration to the WorkflowTracker application. We ll need this to access the database connection string we ll store in the application configuration file. Do this by clicking Add Reference for the WorkflowTracker project. When the Add Reference dialog box comes up, select the .NET tab and then System.Configuration from the list of available .NET assemblies. Click OK. 2. Next, add an application configuration file to the WorkflowTracker application. To do this, right-click the WorkflowTracker tree control node in Visual Studio s Solution Explorer and select Add and then New Item. When the Add New Item dialog box appears, select Application Configuration File from the list and click OK. This adds a new app.config file to your application.
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3. Visual Studio will create the new app.config file and open it for editing. Insert this XML between the configuration opening and closing tags. Note that printing limitations prevent the connectionString attribute from being shown as a single line, but the line you insert should be a single line with no line breaks:
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<connectionStrings> <add name="TrackingDatabase" connectionString="Data Source=(local)\SQLEXPRESS; Initial Catalog=WorkflowTracking;Integrated Security=True;"/> </connectionStrings>
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The connection string I ve shown might or might not work for you. If you re using a different server or a named instance, you ll need to adjust the Data Source value accordingly. Or, if you re using SQL Server authentication, you ll want to replace the Integrated Security value with the UID and PWD (user ID and password, respectively) values that correspond to the SQL login you want to use.
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Part I
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Introducing Windows Workflow Foundation (WF)
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4. Click WorkflowFactory.cs for the WorkflowTracker project in the Visual Studio Solution Explorer, and then click the Solution Explorer s View Code button. 5. So that we can use the Visual Studio IntelliSense capability, add the following lines of code to the top of the file, following the last using directive you find there:
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using System.Workflow.Runtime.Tracking; using System.Configuration;
6. While in the WorkflowFactory.cs file, scan down and find the line where we create the WorkflowRuntime instance. We ll need to introduce SqlTrackingService to the workflow runtime at this point. Add this line of code following the line of code calling GetWorkflowRuntime:
String conn = ConfigurationManager. ConnectionStrings["TrackingDatabase"]. ConnectionString; _workflowRuntime.AddService(new SqlTrackingService(conn));
With that last step, we re done adding code that we ll need to actually perform the tracking. (In a moment, we ll add more code to display the tracking results.) Compile the application by selecting Build Solution from the Build menu, and execute it by pressing the F5 or Ctrl+F5 keys. Note
If the program crashed with an ArgumentException telling you that the runtime can t access the given database, you probably need to add the login account you re using as a valid database user (as specified in the connection string we added to the workflow code a moment ago) or otherwise adjust the connection string. If you re unsure how to do this, the online reference material can help (http://msdn2.microsoft.com/en-us/library/ ms254947(VS.80).aspx), or see your local database administrator for assistance.
Assuming the workflow runs as expected, you should find entries in the WorkflowTracking database s ActivityInstance table, as shown in Figure 5-1. Note To see the table, open SQL Server Management Studio Express (if not already open) and expand the Databases tree control node. Locate the WorkflowTracking database and expand its tree node. Expand the Tables node and right-click the ActivityInstance tree node. From the resulting context menu, select Open Table.
Figure 5-1
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