C# 4 and .NET 4

1328 ❘ ChaPTer 44 windOws wOrkflOw fOundAtiOn 4
UploadPropertyInformation
Return Guid
While (!finished)
Pick
UploadRoomInformation
DetailsComplete
figure 44-14
Defining the WorkflowserviceHost
The workflow begins in a Receive activity which defines the initial service operation of
UploadPropertyInformation. The data received from the service call is stored within the workflow and a
Guid is then returned to the caller by the Send activity. This Guid uniquely defines this workflow instance
and is used when calling back to that instance in the other operations.
Once these initial two activities have completed, the workflow then runs a While activity within which
there is a Pick activity with two branches. The first branch has a Receive activity with an operation
named UploadRoomInformation and the second has a Receive activity with an operation named
DetailsComplete.
The code shown in the following snippet is used to host the workflow. It makes use of the
WorkflowServiceHost class, which is very similar to the ServiceHost class available with WCF.
string baseAddress = "http://localhost:8080/PropertyService";
using (WorkflowServiceHost host =
new WorkflowServiceHost(GetPropertyWorkflow(), new Uri(baseAddress)))
{
host.AddServiceEndpoint(XName.Get("IProperty", ns),
new BasicHttpBinding(), baseAddress);
ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
smb.HttpGetEnabled = true;
host.Description.Behaviors.Add(smb);
try
{
host.Open();
}
Console.WriteLine("Service host is open for business...");
Console.ReadLine();
}
finally
{
host.Close();
}
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