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}; The preceding code creates a new WorkflowInstanceQuery instance, grabs a machine-level environment variable (USERNAME in this case, but you can access any environment variables), and then creates an ActivityQuery object to grab the value of the ClaimID variable for the specific activity. ActivityQuery allows you to define which activities to collect data from, as well as what data to collect. The preceding code specified what data to track and where to get the data from, but not what to do with the data. This is where the tracking participant comes in. The tracking participant is an extension that is added to the runtime and acts on the tracking data that is being captured. The TrackingParticipant class that you use to capture the tracked data and write it to a console window includes a Track method. You need to add the code to do this to the entensions collection on the workflow instance. The following code shows you how to create a participant: public class ConsoleOutputTrackingParticipant : TrackingParticipant { public override void Track(TrackingRecord tr, TimeSpan timeout) { ActivityTrackingRecord atr = tr as ActivityTrackingRecord; if (atr != null) { Console.WriteLine(atr.Name); foreach (var item in atr.Variables) { Console.WriteLine("The variable named {0} equals {1}", item.Key, item.Value); } } } } This example is interesting, but you re more likely to use the new Event Tracing for Windows (ETW) functionality. This is because Trace data can now be correlated between a WCF service and a WF instance. The ETW is a tracing system that is included in Windows and used by components and services, including kernel-level code and drivers. You can use the data written to the ETW through custom code or through tools in AppFabric. AppFabric will include ETW consumers that collect data and store it in a SQL Server database.

the credentials, but that seems too hard. Calling Get-WmiObject and passing the -computer and -credential parameters is much simpler. Maybe the most useful cast is the one that converts an object path to a real object. It is very convenient and saves us the necessity of storing unique parameters like process IDs or service names in order to run a WQL query just to get to the real object at a later point in time. We can use the [wmi] type literal and cast a relative or absolute object path. Here is how to obtain a reference to the DNS cache service using both an absolute and a relative path: PS> [wmi] '\\TESTMACHINE\root\cimv2:Win32_Service.Name="Dnscache"'

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Before you can define an event in the local service interface, you need to define the event arguments class that the event will pass. Add a new C# class to the SharedWorkflows project and name it GuessReceivedEventArgs. An instance of this class is passed with the event as it is raised and contains the latest guess. The class is derived from ExternalDataEventArgs since this is a requirement in order to handle the event with HandleExternalEventActivity. This base class provides the InstanceId property, which identifies the workflow instance that should receive the event. The complete code for the GuessReceivedEventArgs.cs file is shown in Listing 7-1. Listing 7-1. Complete GuessReceivedEventArgs.cs File using System; using System.Workflow.Activities; namespace SharedWorkflows { /// <summary> /// Passes a guess from the local service to a workflow /// </summary> [Serializable] public class GuessReceivedEventArgs : ExternalDataEventArgs { public Int32 NextGuess { get; set; }

: : : : : :

public GuessReceivedEventArgs(Guid instanceId, Int32 nextGuess) : base(instanceId) { NextGuess = nextGuess; } } } The constructor passes the instanceId parameter to the base class. Without this ID, the workflow runtime would have no way to identify the correct workflow instance to receive the event.

Note If you re moving your application from WF 3.X, you should be aware WF 4.0 will not include a SQL Tracking Participant. Instead, you will need to utilize the services in AppFabric to provide this functionality. Also, remember that you can write extensions to provide additional services required by your application, such as an ETW consumer or support for other databases.

Notice that the GuessReceivedEventArgs class is decorated with the Serializable attribute. This is a requirement. An event arguments class must be serializable in order to be passed to a workflow.

PS> [wmi] 'Win32_Service.Name="Dnscache"'

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